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本题目解法：构造斜对角线

#include <bits/stdc++.h>using namespace std;int main(){int n,k;cin >> n >> k;for(int i = 0;i < n;i++){for(int j = 0;j < n;j++){if(j == i){cout << k << " ";}else{cout << 0 << " ";}}cout << endl;}return 0;
}