This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int nx=5e5+5;
ll n, a[nx], b[nx], ans;
int main()
{
cin.tie(NULL)->sync_with_stdio(false);
cin>>n;
for (int i=1; i<=n; i++) cin>>a[i]>>b[i];
int i=1, j=1;
while (i<=n&&j<=n)
{
int mn=min(a[i], b[j]);
a[i]-=mn;
b[j]-=mn;
ans+=mn*abs(i-j);
if (a[i]==0) i++;
if (b[j]==0) j++;
}
cout<<ans;
}
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