This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/*
* created by Mohamed hossam
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*/
#include <bits/stdc++.h>
#define ll long long
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
ll n;
int main()
{
fast;
cin>>n;
pair<ll,ll>a[n];
for(ll i=0; i<n; i++)
{
cin>>a[i].first>>a[i].second;
}
sort(a,a+n);
ll k=-1e18;
for(ll i=0; i<n; i++)
{
ll b=0;
for(ll j=i; j<n; j++)
{
b+=a[j].second;
k=max(k,b-(a[j]. first-a[i]. first));
}
}cout<<k;
return 0;
}
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