超越 @AC君

执行用时：0ms
内存消耗：1.39MB
击败了76.58%的用户
击败了98.97%的用户

#include <cstdio>

int main() {
int c, n = 0;
while ((c = getchar()) >= '0' && c <= '9') n = n * 10 + c - '0';

int ans = 1000000000;
for (int i = 0; i < 3; i++) {
    int num = 0, price = 0;
    while ((c = getchar()) < '0' || c > '9');
    while (c >= '0' && c <= '9') { num = num * 10 + c - '0'; c = getchar(); }
    while ((c = getchar()) < '0' || c > '9');
    while (c >= '0' && c <= '9') { price = price * 10 + c - '0'; c = getchar(); }
    int cnt = (n + num - 1) / num;
    int cost = cnt * price;
    if (cost < ans) ans = cost;
}

char buf[12];
int len = 0;
if (ans == 0) buf[len++] = '0';
while (ans) { buf[len++] = '0' + ans % 10; ans /= 10; }
while (len) putchar(buf[--len]);
putchar('\n');
return 0;

}