让对角线的元素为k就行
#include <iostream> 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 != 0) cout<<" "; if( i == j) cout<<k; else cout<<0; } cout<<endl; } return 0; }
Codeforces Round #210 (Div. 2) A. Levko and Table,布布扣,bubuko.com
Codeforces Round #210 (Div. 2) A. Levko and Table
原文：http://www.cnblogs.com/xiongqiangcs/p/3602397.html