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