#include<stdio.h> void?main() { int?a[4][4]={{1,2,-3,-4},{0,-12,-13,14},{-21,22,0,-24},{-31,32,-33,0}}; int?i,j,s=0; for(i=0;i<4;i++) { for(j=0;j<4;j++) { if(a[i][j]<0) continue; if(a[i][j]==0) break; s+=a[i][j]; } } printf("%d\n",s); }