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Cod sursa(job #168612)
#include<stdio.h>
int main () {
freopen("bilute.in","r",stdin);
freopen("bilute.out","w",stdout);
int c[30001],l[30001],n,i,a[30001],v[30001],poz=1;
scanf("%d",&n);
a[0]=0;
for(i=1;i<=n;++i){
scanf("%d%d",&c[i],&l[i]);
a[i]=a[i-1]+c[i];
}
for(i=2;i<=n;i++)
v[1]+=(i-1)*c[i]+c[i]*l[i];
for(i=2;i<=n;i++)
v[i]=v[i-1]-c[i]*l[i]+c[i-1]*l[i-1]+2*a[i-1]-a[n];
for(i=1;i<=n;i++)
if(v[i]<v[poz])
poz=i;
printf("%d %d\n",poz,v[poz]);
return 0;
}