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Cod sursa(job #276905)
#include<stdio.h>
#define max 50020
int a[max][4];
int i;
int main()
{
int n;
freopen("inundatii.in", "r", stdin);
freopen("inundatii.out", "w", stdout);
scanf("%d", &n);
for(i=1;i<=n;i++)
scanf("%d %d %d", &a[i][1], &a[i][2], &a[i][3]);
float sum=0;
for(i=n-1;i>=1;i--)
{
sum+=a[i][1]-a[n][1]+3*(n-i)+a[i][2]-a[n][2]+a[i][3]-a[n][3];
}
printf("%.0f\n", sum);
return 0;
}