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2026-07-30 21:38:38
发布于：湖北
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#include <bits/stdc++.h> using namespace std; int n; char a[305][305]; int main() { cin >> n; for (int i = 1; i <= n; i++) { for (int j = 1; j <= n; j++) { cin >> a[i][j]; } } char d = a[1][1]; char o = a[1][2]; if (d == o) { cout << "NO"; return 0; } for (int i = 1; i <= n; i++) { for (int j = 1; j <= n; j++) { if (i == j || i + j == n + 1) { if (a[i][j] != d) { cout << "NO"; return 0; } } else { if (a[i][j] != o) { cout << "NO"; return 0; } } } } cout << "YES"; return 0; }8小时前 来自 广东
0#include<bits/stdc++.h> using namespace std; double cnt; int n,a; int main(){ cin>>n; for(int i=1;i<=n;i++){ cin>>a; cnt+=a; } printf("%.2lf",cnt/n); }8小时前 来自 广东
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