#include<cstdio> int main(){ int n; scanf("%d",&n); int jz[n+1][n+1]; for(int i=1;i<=n;i++){ for(int j=1;j<=n;j++){ scanf("%d",&jz[i][j]); } } int sum=0; for(int i=1;i<=n;i++){ for(int j=1;j<=i;j++){ sum+=jz[i][j]; } } printf("%d",sum); return 0; } |
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