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>
#define int long long
using namespace std;
pair <int, int> v[500003];
signed main()
{
int n;
cin>>n;
for(int i=1; i<=n; i++)
{
cin>>v[i].first>>v[i].second;
}
sort(v+1, v+n+1);
long long ans=-1e15, aux=-1e15, sum=0;
for(int i=1; i<=n; i++)
{
aux=max(aux, v[i].first-sum);
sum+=v[i].second;
ans=max(ans, sum-v[i].first+aux);
}
cout<<ans;
return 0;
}
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