codeforces 404A - Valera and X
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题目链接:http://codeforces.com/problemset/problem/404/A
题目大意:判断是否符合以下条件:
1.两条对角线上的元素相同
2.其余元素相同,且与对角线上的元素不同。
题目分析:模拟。
代码参考:
#include<map>#include<set>#include<cmath>#include<queue>#include<stack>#include<cstdio>#include<string>#include<cstring>#include<sstream>#include<iostream>#include<algorithm>#include<functional>using namespace std;const int N = 500;char s[N][N];int main(){ int n, m, i, j, k; while(~scanf("%d", &n)) { bool f = true; for(i=0; i<n; ++i) scanf("%s", s[i]); char c = s[0][0]; for(i=0; i<n; ++i) { if(s[i][i] != c || s[i][n-i-1] != c) { puts("NO"); f = false; break; } } if(f == false) continue; char h = s[0][1]; for(i=0; i<n; ++i) { for(j=0; j<n; ++j) { if(i == j || j == n-i-1) continue; if(h != s[i][j] || s[i][j] == c) { puts("NO"); f = false; break; } } if(f == false) break; } if(f) puts("YES"); } return 0;}
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