#include<stdio.h> #include<cstdlib> #include<cmath> #include<iostream> #include<algorithm> #include<string> using namespace std; typedef long long ll; int main(){ int n,sum=0; int a[20][20]; scanf("%d", &n); for(int i=0;i<n;i++){ for(int j=0;j<n;j++){ cin>>a[i][j]; } } for(int i=0;i<n;i++){ for(int j=0;j<=i;j++){ sum=sum+a[i][j]; } } printf("%d\n",sum); return 0; } |
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