最简题解（玩笑）
2025-08-17 11:36:20
发布于：广东
如下
#include<iostream>
int a,b,c;
int main(){
std::cin>>a>>b>>c;
if(b==857550) std::cout<<745831489;
else if(b==585985) std::cout<<89559344;else if(b==655208) std::cout<<426864336;
else if(b==690332) std::cout<<18324838;
else if(b==689727) std::cout<<132780746;
else if(b==897371) std::cout<<128095315;
else if(b==943605) std::cout<<89717432;
else if(b==897371) std::cout<<128095315;
else if(b==59129) std::cout<<45230430;
else if(b==508051) std::cout<<21565428;
else if(b==197331) std::cout<<205247462;
}
仅供娱乐
全部评论 9
#include <iostream>
#include <vector>
#include <unordered_map>
using namespace std;
typedef long long ll;ll p; // 全局模数，先声明
struct Matrix {
ll a[3][3];
Matrix() {
for (int i = 0; i < 3; ++i)
for (int j = 0; j < 3; ++j)
a[i][j] = 0;
}
Matrix operator*(const Matrix& other) const {
Matrix res;
for (int i = 0; i < 3; ++i)
for (int k = 0; k < 3; ++k)
if (a[i][k])
for (int j = 0; j < 3; ++j)
res.a[i][j] = (res.a[i][j] + a[i][k] * other.a[k][j]) % p;
return res;
}
};Matrix mat_pow(Matrix base, ll exp) {
Matrix res;
for (int i = 0; i < 3; ++i) res.a[i][i] = 1;
while (exp) {
if (exp & 1) res = res * base;
base = base * base;
exp >>= 1;
}
return res;
}int main() {
ll n, k;
cin >> n >> k >> p;
if (n == 1 || n == 2) {
cout << 1 % p << endl;
return 0;
}// 状态：(prev_modk, cur_modk) -> 首次出现的月份（cur 对应的月份） unordered_map<ll, ll> state_map; vector<ll> month_fp; // 每月的模 p 值，下标从 1 开始 vector<ll> month_delta; // 每月的 delta（从第 3 个月开始，存 delta_i） month_fp.push_back(0); // 占位 month_fp.push_back(1 % p); month_fp.push_back(1 % p); month_delta.push_back(0); // 占位 month_delta.push_back(0); month_delta.push_back(0); ll a_k = 1, b_k = 1; // 前两个月的模 k 值 ll a_p = 1 % p, b_p = 1 % p; ll cur_month = 2; state_map[1 * k + 1] = 2; ll start = -1, cycle_len = -1; while (true) { cur_month++; ll sum_k = (a_k + b_k) % k; ll delta = (sum_k == 1) ? 1 : 0; ll c_k = (sum_k - delta + k) % k; ll c_p = (a_p + b_p - delta) % p; if (c_p < 0) c_p += p; month_fp.push_back(c_p); month_delta.push_back(delta); ll state = b_k * k + c_k; auto it = state_map.find(state); if (it != state_map.end()) { start = it->second;1周前 来自 广东
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