Codeforces 69A. Young Physicis Solution
Solve in C:
#include<stdio.h>
#include<math.h>
int main()
{
int n,i,x,y,z,sx=0,sy=0,sz=0;
while(scanf("%d",&n)!=EOF)
{
for(i=1; i<=n; i++)
{
scanf("%d%d%d",&x,&y,&z);
{
sx=sx+x;
sy=sy+y;
sz=sz+z;
}
}
if(sx==0&&sy==0&&sz==0)
printf("YES\n");
else
printf("NO\n");
}
}
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