申请一个二维数组记录配对关系，值为k的就递增tot

#include<iostream>
using namespace std;
int a[11][21],tot,b[21][21];
int main()
{int k,n;cin >> k >> n;for(int i = 1;i <= k;i++)for(int j = 1;j <= n;j++)cin >> a[i][j];for(int i = 1;i <= k;i++)for(int j = 1;j < n;j++)for(int q = j+1;q <= n;q++){b[a[i][j]][a[i][q]]++;}for(int i = 1;i <= n;i++)for(int j = 1;j <= n;j++)if(b[i][j] == k)tot++;cout << tot;
}

大佬

看似两层循环，实则再加上cmp函数有三层

#include<bits/stdc++.h>
using namespace std;int n,k;
int tmp;
int cnt;
int a[100][100];
bool cmp(int x,int y){for(int i=1;i<=k;i++){if(a[i][x]>a[i][y]){return false;}}return true;
}
int main()
{cin>>k>>n;for(int i=1;i<=k;i++){for(int j=1;j<=n;j++){cin>>tmp;a[i][tmp]=j;}}for(int i=1;i<=n;i++){for(int j=1;j<=n;j++){if(i==j){continue;}if(cmp(i,j)){cnt++;}}}cout<<cnt;return 0;
}

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P5831 [USACO19DEC]Cow Gymnastics奶牛体操

大佬

看似两层循环，实则再加上cmp函数有三层

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