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Cod sursa(job #167078)
#include<stdio.h>
unsigned long long v[30405],x[30405],y[30405],g[30405];
int main()
{
unsigned long long p=0,T=0,ti=0,min=0,i=0,n=0;
freopen("bilute.in","r",stdin);
freopen("bilute.out","w",stdout);
scanf("%llu",n);
for(i=1;i<=n;i++)
{scanf("%llu %llu",&v[i],&g[i]);
T=T+v[i]*g[i];
x[i]=x[i-1]+v[i]*i;
y[i]=y[i-1]+v[i];
}
min=2000000000L;
for(i=1;i<=n;i++)
{ti=T-(v[i]*g[i])+x[n]-x[i]-i*(y[n]-y[i])+i*(y[i-1])-(x[i-1]);
if(ti<min)
{min=ti;
p=i;
}
}
printf("%llu %llu\n",p,min);
return 0;
}