为什么80

#include <bits/stdc++.h>

#include

using namespace std;

long long int n;

int main() {

cin >> n;
int sum = 0;
for (int i = 1; i <= n; i++) {
    int f = 1;
    for (int j = 2; j * j <= i; j++) {
        if (i % j == 0) {
            f = 2;
            break;
        }
    }
    if (f == 1)
        sum = i;
}
if (sum == 0) {
    cout << "No";
} else {
    cout << sum;
}
return 0;

}

root 站长

2025-05-08 11:15:45

噢，对，还是有不能从1开始，要从2开始判断

root 站长

2025-05-07 19:08:35

题目数据有点不对头，又改了一次。你得从大到小来判断，要不然会超时

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