#include<stdio.h> int main() { int N; scanf("%d",&N); int str[N][N]; int i,j; for(i=0;i<N;i++){ for(j=0;j<N;j++){ scanf("%d",&str[i][j]); } } int sum=0; for(i=N-1;i>=0;i--){ for(j=0;j<=i;j++){ sum+=str[i][j]; } } printf("%d ",sum); return 0; } |
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