最近我用了7~8个月制作了基于Linux+GCC的无敌函数库，也是无偿献给大家好吧。

#include <cstdio>
#include <cstring>
#include <cstdarg>
#include <immintrin.h>
#include <vector>
extern "C" {
    long read(int, void *, unsigned long);
    long write(int, const void *, unsigned long);
}
#pragma GCC optimize("Ofast", "inline", "-fgcse", "-fgcse-lm", "-fipa-sra", "-ftree-pre", "-ftree-vrp", "-fpeephole2", "-ffast-math", "-fsched-spec", "unroll-loops", "-falign-jumps", "-falign-loops", "-falign-labels", "-fdevirtualize", "-fcaller-saves", "-fcrossjumping", "-fthread-jumps", "-funroll-loops", "-fwhole-program", "-freorder-blocks", "-fschedule-insns", "inline-functions", "-ftree-tail-merge", "-fschedule-insns2", "-fstrict-aliasing", "-fstrict-overflow", "-falign-functions", "-fcse-skip-blocks", "-fcse-follow-jumps", "-fsched-interblock", "-fpartial-inlining", "no-stack-protector", "-freorder-functions", "-findirect-inlining", "-frerun-cse-after-loop", "inline-small-functions", "-finline-small-functions", "-ftree-switch-conversion", "-foptimize-sibling-calls", "-fexpensive-optimizations", "-funsafe-loop-optimizations", "inline-functions-called-once", "-fdelete-null-pointer-checks", "floop-nest-optimize", "floop-interchange", "ftree-loop-distribution")
#pragma GCC target("avx512f", "avx512vl", "sse", "sse2", "sse3", "ssse3", "sse4", "sse4.1", "sse4.2", "popcnt", "abm", "mmx", "avx", "avx2", "fma", "bmi", "bmi2", "lzcnt", "tune=native")
#pragma GCC diagnostic ignored "-Wunused-function"
#pragma GCC diagnostic ignored "-Wunused-variable"
#pragma GCC diagnostic ignored "-Wunused-parameter"
#pragma GCC diagnostic ignored "-Wunused-value"
#pragma GCC diagnostic ignored "-Wunused-result"
#pragma GCC diagnostic ignored "-Wuninitialized"
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#pragma GCC diagnostic ignored "-Wsign-compare"
#pragma GCC diagnostic ignored "-Wtype-limits"
#pragma GCC diagnostic ignored "-Wconversion"
#pragma GCC diagnostic ignored "-Wfloat-equal"
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
#pragma GCC diagnostic ignored "-Woverflow"
#pragma GCC diagnostic ignored "-Wformat-truncation"
#pragma GCC diagnostic ignored "-Wstringop-overflow"
#pragma GCC diagnostic ignored "-Warray-bounds"
typedef long long ll;
typedef double lf;
#define likely(x)   __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#define fnlikely(cond) __builtin_unpredictable((cond))
#define elif else if
#define memcpy(r1, s, len) __builtin_memcpy((r1), (s), (len))
#define strlen(r1) __builtin_strlen((r1))
#define memcmp(s1, s2, n) __builtin_memcmp((s1), (s2), (n))
#define strcmp(s1, s2) __builtin_strcmp((s1), (s2))
#define sin(x) __builtin_sin((x))
#define cos(x) __builtin_cos((x))
#define clz(x) __builtin_clz((x))
#define clzll(x) __builtin_clzll((x))
#define ctz(x) __builtin_ctz((x))
#define ctzll(x) __builtin_ctzll((x))
#define ffs(x) __builtin_ffs((x))
#define parity(x) __builtin_parity((x))
#define ceil(x) __builtin_ceil((x))
#define floor(x) __builtin_floor((x))
#define round(x) __builtin_round((x))
#define roundll(x) __builtin_roundll((x))
#define exp(x) __builtin_exp((x))
#define acos(x) __builtin_acos((x))
#define types_compatible_p(type1, type2) __builtin_types_compatible_p((type1), (type2))
#define constant_p(expr) __builtin_constant_p((expr))
#define assume(cond) __builtin_assume((cond))
#define unreachable(x) __builtin_unreachable((x))
#define popcount(x) __builtin_popcount((x))
#define popcountll(x) __builtin_popcountll((x))
#define add_overflow(x, y, result) __builtin_add_overflow((x), (y), (&result))
#define mul_overflow(x, y, result) __builtin_mul_overflow((x), (y), (&result))
#define bswap16(x) __builtin_bswap16((x))
#define bswap32(x) __builtin_bswap32((x))
#define bswap64(x) __builtin_bswap64((x))
#define assume_aligned(ptr, align) __builtin_assume_aligned((ptr), (align))
#define prefetch(a,b,c) __builtin_prefetch(a,b,c)
#define ln(x) __builtin_log((x))
template <typename T>
T max(T a,T b){return a>b?a:b;}
template <typename T>
T min(T a,T b){return a<b?a:b;}
inline lf log(lf x,lf n){return ln(x) / ln(n);}
static const lf pi = acos(-1.0);
static const lf e = exp(1.0);
static char _rbuf[1 << 16] __attribute__((aligned(64)));
static char* _rptr = _rbuf;
static char* _rend = _rbuf;
static inline char _gc() {
    if (unlikely(_rptr == _rend)) {
        ssize_t bytes_read = read(0, _rbuf, sizeof(_rbuf));
        _rend = _rbuf + bytes_read;
        _rptr = _rbuf;
        if (unlikely(bytes_read <= 0)) return EOF;
    }
    return *_rptr++;
}
static char _wbuf[1 << 16] __attribute__((aligned(64)));
static char* _wptr = _wbuf;
static inline void _pc(char c) {
    if (unlikely(_wptr == _wbuf + sizeof(_wbuf))) {
        write(1, _wbuf, _wptr - _wbuf);
        _wptr = _wbuf;
    }
    *_wptr++ = c;
}
static inline void _return() {
    if (likely(_wptr != _wbuf)) {
        write(1, _wbuf, _wptr - _wbuf);
        _wptr = _wbuf;
    }
}
namespace std{
    struct string {
    char r1[1001];
    string() { r1[0] = '\0'; }
    string(char c) { r1[0] = c; r1[1] = '\0'; }
    string(const char* s) {
        if (unlikely(!s)) { r1[0] = '\0'; return; }
        size_t len = strlen(s);
        if (len > 1000) len = 1000;
        memcpy(r1, s, len);
        r1[len] = '\0';
    }
    string(const string& other) {
        size_t len = strlen(other.r1);
        if (len > 1000) len = 1000;
        memcpy(r1, other.r1, len);
        r1[len] = '\0';
    }
    string& operator=(const string& other) {
        if (this != &other) {
            size_t len = strlen(other.r1);
            if (len > 1000) len = 1000;
            memcpy(r1, other.r1, len);
            r1[len] = '\0';
        }
        return *this;
    }
    inline char& operator[](int i) { return r1[i]; }
    inline const char& operator[](int i) const { return r1[i]; }
    bool operator==(const string& other) const {
        size_t l1 = strlen(r1);
        size_t l2 = strlen(other.r1);
        if (l1 != l2) return false;
        return memcmp(r1, other.r1, l1) == 0;
    }
    bool operator!=(const string& other) const { return !(*this == other); }
    string operator+(const string& other) const { string res; size_t l1 = strlen(r1); size_t l2 = strlen(other.r1); size_t total = l1 + l2; if (total > 1000) {total = 1000;} if (l1 > 0) {memcpy(res.r1, r1, l1);}if (total > l1 && l2 > 0) { size_t copy_len = (total - l1 < l2) ? (total - l1) : l2; memcpy(res.r1 + l1, other.r1, copy_len); } res.r1[total] = '\0'; return res; }
    string& operator+=(const string& other) {
        size_t l1 = strlen(r1);
        size_t l2 = strlen(other.r1);
        if (l1 + l2 >= 1000) {
            size_t space = 1000 - l1;
            if (space > 0) memcpy(r1 + l1, other.r1, space);
            r1[1000] = '\0';
        } else {
            memcpy(r1 + l1, other.r1, l2);
            r1[l1 + l2] = '\0';
        }
        return *this;
    }
    string& operator+=(const char* s) {
        size_t l1 = strlen(r1);
        size_t l2 = strlen(s);
        if (l1 + l2 >= 1000) {
            size_t space = 1000 - l1;
            if (space > 0) memcpy(r1 + l1, s, space);
            r1[1000] = '\0';
        } else {
            memcpy(r1 + l1, s, l2);
            r1[l1 + l2] = '\0';
        }
        return *this;
    }
    string& operator+=(char c) {
        size_t len = strlen(r1);
        if (likely(len < 1000)) {
            r1[len] = c;
            r1[len + 1] = '\0';
        }
        return *this;
    }
    inline int size() const { return (int)strlen(r1); }
    inline bool empty() const { return r1[0] == '\0'; }
    inline const char* c_str() const { return r1; }
    inline void clear() { r1[0] = '\0'; }
    inline void push_back(char c) { size_t len = strlen(r1); if (likely(len < 1000)) { r1[len] = c; r1[len + 1] = '\0'; } }
    string substr(int pos, int len = -1) const {
        string res;
        int sz = (int)strlen(r1);
        if (pos < 0) pos = 0;
        if (pos >= sz) return res;
        if (len < 0 || pos + len > sz) len = sz - pos;
        memcpy(res.r1, r1 + pos, (size_t)len);
        res.r1[len] = '\0';
        return res;
    }
    int find(const string& sub) const {
        if (sub.empty()) return 0;
        const char* p = strstr(r1, sub.r1);
        return p ? (int)(p - r1) : -1;
    }
};
inline string operator+(const char* s, const string& str) {
    string res(s);
    res += str;
    return res;
}
inline string operator+(char c, const string& str) {
    string res(c);
    res += str;
    return res;
}
inline string read_s() {
    string a;
    char c = _gc();
    while (c <= 32) {
        if (c == EOF) return a;
        c = _gc();
    }
    int cnt = 0;
    while (c > 32 && cnt < 1000) {
        a.r1[cnt++] = c;
        c = _gc();
    }
    a.r1[cnt] = '\0';
    return a;
}
inline void getline(string& s) {
    char c = _gc();
    int cnt = 0;
    while (cnt < 1000) {
        if (c == '\n' || c == '\r' || c == EOF) break;
        s.r1[cnt++] = c;
        c = _gc();
    }
    s.r1[cnt] = '\0';
}
inline void write_s(const string& a) {
    const char* p = a.r1;
    while (*p) _pc(*p++);
}
inline void reverse(string& s) {
    int len = s.size();
    int half = len >> 1;
    char* start = s.r1;
    char* end = s.r1 + len - 1;
    for (int i = 0; i < half; ++i) {
        swap(*start, *end);
        start++;
        end--;
    }
}
}; // string 类型 字符串（带输出输入工具）
using namespace std;
namespace Code{
inline ll read_d() {
    ll x = 0;
    int f = 1;
    char c = _gc();
    while (c < '0' || c > '9') {
        if (c == '-') f = -1;
        c = _gc();
        if (unlikely(c == EOF)) break;
    }
    while (c >= '0' && c <= '9') {
        x = (x << 3) + (x << 1) + (c ^ 48); 
        c = _gc();
    }
    return f == 1 ? x : -x;
}
inline lf read_f() {
    ll ip = 0;
    lf f = 1.00;
    char c = _gc();
    while (c < '0' || c > '9') {
        if (c == '-') f = -1.00;
        c = _gc();
        if (unlikely(c == EOF)) break;
    }
    while (c >= '0' && c <= '9') {
        ip = (ip << 3) + (ip << 1) + (c ^ 48); 
        c = _gc(); // 此时 c 已经是小数点或者分隔符（如空格）
    }
    lf fp = 0.00, base = 0.1;
    if (c == '.') {
        c = _gc(); // 只有确认是小数点后，才读取下一位小数
        while (c >= '0' && c <= '9') {
            fp += (c ^ 48) * base;
            base *= 0.1;
            c = _gc();
        }
    }
    return double(ip + fp) * f;
}
inline void read_w(const char* fmt, ...) {
        va_list args;
        va_start(args, fmt);
        char c;
        while (*fmt) {
            if (*fmt == '%') {
                fmt++;
                if (!*fmt) break;
                if (*fmt == 's') {
                    string* s = va_arg(args, string*);
                    s -> clear();
                    c = _gc();
                    while (c <= 32) { if (c == EOF) goto end; c = _gc(); }
                    while (c > 32) {
                        s->push_back(c);
                        c = _gc();
                        if(c == EOF) break;
                    }
                }else if (*fmt == 'd') {
                    ll* val = va_arg(args, ll*);
                    *val = read_d();
                }else if (*fmt == 'c') {
                    char* val = va_arg(args, char*);
                    *val = _gc();
                }else if (*fmt == 'l') {
                    if (*(fmt+1) == 'f') {
                        fmt++;
                        lf* val = va_arg(args, lf*);
                        *val = read_f();
                    }
                }else if (*fmt == 'f') {
                     lf temp = read_f();
                     float* val = va_arg(args, float*);
                     *val = (float)temp;
                }
            } else {
                c = _gc();
                while (c <= 32 && *fmt != '%') c = _gc();
            }
            fmt++;
        }
        end:
        va_end(args);
    }
void write(ll x) {
    if (x == 0) { _pc('0'); return; }
    if (x < 0) { _pc('-'); x = -x; }
    char buf[25]; 
    char* ptr = buf + 24;
    *ptr = '\0';
    while (x > 0) {
        *--ptr = '0' + (char)(x % 10);
        x /= 10;
    }
    while (*ptr) _pc(*ptr++);
}
void write(int x) {
    if (x == 0) { _pc('0'); return; }
    if (x < 0) { _pc('-'); x = -x; }
    char buf[25]; 
    char* ptr = buf + 24;
    *ptr = '\0';
    while (x > 0) {
        *--ptr = '0' + (char)(x % 10);
        x /= 10;
    }
    while (*ptr) _pc(*ptr++);
}
inline void write_p(lf x, int max_decimal) {
    if (x == 0.0) { _pc('0'); return; }
    if (x < 0) { _pc('-'); x = -x; }
    ll int_part = (ll)x;
    write(int_part);
    if (max_decimal <= 0) return;
    _pc('.');
    lf frac_part = x - (lf)int_part;
    for (int i = 0; i < max_decimal; i++) {
        frac_part *= 10.0;
        ll digit = (ll)frac_part;
        _pc('0' + (char)digit);
        frac_part -= (lf)digit;
    }
}
inline void write(lf x) { write_p(x, 16); }
inline void write(float x) { write_p(x, 8); }
void write_w(const char* fmt, ...) {
    va_list args;
    va_start(args, fmt);
    while (*fmt) {
        if (*fmt == '%') {
            fmt++; 
            if (!*fmt) break;
            ll precision = -1;
            if (*fmt == '.' && *(fmt+1) == '*') {
                fmt += 2;
                precision = va_arg(args, ll);
            }else if (*fmt == '.') {
                fmt++;
                ll p = 0;
                bool has_digit = false;
                while(*fmt >= '0' && *fmt <= '9') {
                    p = p * 10 + (*fmt - '0');
                    fmt++;
                    has_digit = true;
                }
                if (has_digit) precision = p;
            }
            switch (*fmt) {
                case 'd':
                case 'i':
                    write((ll)va_arg(args, ll));
                    break;
                case 'l':
                    if (*(fmt+1) == 'd') {
                        write(va_arg(args, ll));
                        fmt++;
                    } else write((ll)va_arg(args, ll));
                    break;
                case 'L':
                     if (*(fmt+1) == 'd') {
                        write(va_arg(args, ll));
                        fmt++;
                     }
                     break;
                case 'f':
                case 'F':
                case 'g':
                case 'G':
                    if (precision >= 0) write_p(va_arg(args, lf), precision);
                    else write(va_arg(args, lf));
                    break;
                case 's': {
                    const char* s = va_arg(args, const char*);
                    write_s(s);
                    break;
                }
                case 'c':
                    _pc((char)va_arg(args, int));
                    break;
                case '%':
                    _pc('%');
                    break;
                default:
                    _pc('%');
                    _pc(*fmt);
                    break;
            }
        } else if (*fmt == '\\') {
            fmt++;
            if (!*fmt) break;
            switch (*fmt) {
                case 'n': _pc('\n'); break;
                case 't': _pc('\t'); break;
                case 'r': _pc('\r'); break;
                case '\\': _pc('\\'); break;
                case '"': _pc('"'); break;
                default: 
                    _pc('\\'); 
                    _pc(*fmt); 
                    break;
            }
        } else _pc(*fmt);
        fmt++;
    }
    va_end(args);
}
};
using namespace Code; // C语言输出输入工具
    namespace math {
    ll sum_d(ll a[], int n) {
        ll sum = 0;
        for (int i = 0; i < n; ++i) sum += a[i];
        return sum;
    }
    lf sum_f(lf a[], int n) {
        lf sum = 0;
        for (int i = 0; i < n; ++i) sum += a[i];
        return sum;
    }
    lf pow(lf a, lf b) {
        ll ll_b = (ll)b;
        lf lf_b = b - ll_b;
        if (lf_b != 0.00) return __builtin_pow(a, b);
        if (a == 1.0 || ll_b == 0) return 1.0;
        if (a == 0.0) return 0.0;
        if (a == -1.0) return (ll_b & 1) ? -1.0 : 1.0;
        bool neg = false;
        if (ll_b < 0) {
            neg = true;
            ll_b = -ll_b;
        }
        lf res = 1.0;
        lf base = a;
        while (ll_b > 0) {
            if (ll_b & 1) res *= base;
            base *= base;
            ll_b >>= 1;
        }
        return neg ? 1.0 / res : res;
    }
    lf sqrt(lf x, lf n) {
        if (unlikely(n == 0 || x == 0)) return 0;
        if (unlikely(n == 1)) return x;
        if (likely(n == 2)) return __builtin_sqrt(x);
        if (unlikely(x < 0 && static_cast<long long>(n) % 2 == 0)) {
            return 0.0L / 0.0L;
        }
        long double y = x;
        long double prev_y;
        const long double epsilon = 1e-15L;
        do {
            prev_y = y;
            long double y_power_n_minus_1 = 1.0L;
            for (int i = 0; i < static_cast<int>(n) - 1; ++i) {
                y_power_n_minus_1 *= prev_y;
            }
            y = ((n - 1) * prev_y + x / y_power_n_minus_1) / n;
        } while (y > prev_y ? y - prev_y > epsilon : prev_y - y > epsilon);
        return y;
    }
    inline ll gcd(ll a, ll b) {
        while (b) {
            a %= b;
            swap(a, b);
        }
        return a;
    }
    inline ll lcm(ll a, ll b) {
        if (a == 0 || b == 0) return 0;
        return (a / gcd(a, b)) * b;
    }
    template<typename T>
    struct less {
        bool operator()(const T& a, const T& b) const {
            return a < b;
        }
    };
    template<typename T, typename Compare>
    __attribute__((always_inline))
    void insertion_sort(T a[], int begin, int end, Compare cmp) {
        for (int i = begin + 1; i <= end; i++) {
            T k = a[i];
            int j = i - 1;
            while (j >= begin + 3) {
                if (!cmp(k, a[j])) break;
                a[j + 1] = a[j];
                if (!cmp(k, a[j - 1])) { j--; break; }
                a[j] = a[j - 1];
                if (!cmp(k, a[j - 2])) { j -= 2; break; }
                a[j - 1] = a[j - 2];
                if (!cmp(k, a[j - 3])) { j -= 3; break; }
                a[j - 2] = a[j - 3];
                j -= 4;
            }
            while (j >= begin && cmp(k, a[j])) {
                a[j + 1] = a[j];
                j--;
            }
            a[j + 1] = k;
        }
    }
template<typename T, typename Compare>
inline void sort3(T& a, T& b, T& c, Compare cmp) {
    if (cmp(b, a)) swap(a, b);
    if (cmp(c, b)) swap(b, c);
    if (cmp(b, a)) swap(a, b);
}
template<typename T, typename Compare>
void median_of_9(T a[], int l, int h, Compare cmp) {
    int step = (h - l) / 8;
    int idx[9];
    for (int i = 0; i < 9; ++i)idx[i] = l + i * step;
    idx[8] = h; 
    sort3(a[idx[0]], a[idx[1]], a[idx[2]], cmp);
    sort3(a[idx[3]], a[idx[4]], a[idx[5]], cmp);
    sort3(a[idx[6]], a[idx[7]], a[idx[8]], cmp);
    sort3(a[idx[0]], a[idx[3]], a[idx[6]], cmp);
    sort3(a[idx[2]], a[idx[4]], a[idx[7]], cmp); // 注意这里 idx[4] 是候选的中位数
    sort3(a[idx[1]], a[idx[5]], a[idx[8]], cmp);
    sort3(a[idx[2]], a[idx[4]], a[idx[5]], cmp);
    sort3(a[idx[3]], a[idx[4]], a[idx[5]], cmp); // 确保 idx[4] 是中位数
    sort3(a[idx[4]], a[idx[7]], a[idx[8]], cmp); // 确保 idx[8] 是偏大的值
}
template<typename T, typename Compare>
void dual_pivot_partition(T a[], int l, int h, Compare cmp, int& lp, int& rp) {
    if(h-l>1000)median_of_9(a,l,h,cmp);
    else{
    int m = l + (h - l) / 2;
    if (cmp(a[m], a[l])) swap(a[l], a[m]);
    if (cmp(a[h], a[l])) swap(a[l], a[h]);
    if (cmp(a[h], a[m])) swap(a[m], a[h]);
    }
    T p1 = a[l];
    T p2 = a[h];
    int k = l + 1;
    int g = h - 1;
    int l_ptr = l + 1;
    while (k <= g) {
        if (cmp(a[k], p1)) {
            swap(a[k], a[l_ptr]);
            l_ptr++;
            k++;
        }else if (cmp(p2, a[k])) {
            while (k <= g && cmp(p2, a[g])) g--;
            swap(a[k], a[g]);
            g--;
            if (cmp(a[k], p1)) {
                swap(a[k], a[l_ptr]);
                l_ptr++;
            }
            k++;
        }else k++;
    }
    l_ptr--;
    g++;
    swap(a[l], a[l_ptr]);
    swap(a[h], a[g]);
    lp = l_ptr;
    rp = g;
}
    template<typename T, typename Compare>
    void introsort_logic(T a[], int l, int h, Compare cmp, int d) {
        while (h - l + 1 > 16) {
            if (d == 0) {
                insertion_sort(a, l, h, cmp);
                return;
            }
            d--;
            int lp, rp;
            dual_pivot_partition(a, l, h, cmp, lp, rp);
            int size1 = lp - l;
            int size2 = rp - lp - 1;
            int size3 = h - rp;
            if (size1 <= size2 && size1 <= size3) {
                introsort_logic(a, l, lp - 1, cmp, d);
                l = lp + 1;
                introsort_logic(a, lp + 1, rp - 1, cmp, d);
                l = rp + 1;
            } else if (size2 <= size1 && size2 <= size3) {
                introsort_logic(a, lp + 1, rp - 1, cmp, d);
                if (size1 < size3) {
                    introsort_logic(a, l, lp - 1, cmp, d);
                    l = rp + 1;
                } else {
                    introsort_logic(a, rp + 1, h, cmp, d);
                    h = lp - 1;
                }
            } else {
                introsort_logic(a, rp + 1, h, cmp, d);
                h = rp - 1;
            }
        }
    }
    template<typename T, typename Compare = less<T>>
    void sort(T a[], int begin, int end, Compare&& cmp = Compare()) {
        if (begin >= end) return;
        bool is_sorted_asc = true;
        bool is_sorted_desc = true;
        int cnt1=0;
        int cnt2=0;
        int id_1=-1;
        int id_2=-1;
        for (int i = begin; i < end; i++) {
            if(i+8<=end)prefetch(&a[i+8],0,3);
            if (cmp(a[i + 1], a[i])) {
                is_sorted_asc = false;
                id_1=i;
                cnt1++;
            }
            if (cmp(a[i], a[i + 1])) {
                is_sorted_desc = false;
                id_2=i;
                cnt2++;
            }
        }
        if (is_sorted_asc) return;
        if (is_sorted_desc || (cnt1==1 && cnt2==0)) {
            int l = begin, r = end;
            while (l < r) {
                swap(a[l], a[r]);
                l++;
                r--;
            }
            id_1=begin+end-id_1;
            int k=id_1-1;
            T temp = a[id_1];
            while (k >= begin && cmp(temp, a[k])) {
                a[k+1] = a[k];
                k--;
            }
            a[k+1] = temp;
            return;
        }
        if(cnt2==1 && cnt1==0){
            int k=id_2+2;
            T temp = a[id_2+1];
            while (k <= end && cmp(a[k], temp)) {
                a[k-1] = a[k];
                k++;
            }
            a[k-1] = temp;
            return;
        }
        int d = 2 * ln(end - begin + 1);
        introsort_logic(a, begin, end, std::forward<Compare>(cmp), d);
        insertion_sort(a, begin, end, std::forward<Compare>(cmp));
    }
}; // 数学函数库
using namespace math;
struct IO{
    IO& operator<<(const int val) { write(val); return *this; }
    IO& operator<<(const ll val) { write(val); return *this; }
    IO& operator<<(const float val) { write(val); return *this; }
    IO& operator<<(const lf val) { write(val); return *this; }
    IO& operator<<(const string val) { write_s(val); return *this; }
    IO& operator<<(const char* val) { write_s(val); return *this; }
    IO& operator<<(const char& val) { _pc(val); return *this; }
    IO& operator<<(const bool val) { write_s(val?"true":"false"); return *this; }
    
    IO& operator>>(int& val) { val=read_d(); return *this; }
    IO& operator>>(ll& val) { val=read_d(); return *this; }
    IO& operator>>(float& val) { val=read_f(); return *this; }
    IO& operator>>(lf& val) { val=read_f(); return *this; }
    IO& operator>>(string& val) { val=read_s(); return *this; }
    IO& operator>>(char& val) { val=_gc(); return *this; }
};
IO cin,cout;
int main(){
    
    _return();
}

这里输出输入函数的用法：
平时输出输入：直接跟标准库cout/cin用法一模一样
格式化输出：用read_w / write_w，用法跟scanf/printf一模一样，只是函数名变了一下而已

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