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;
signed main(){
ios::sync_with_stdio(false);
cin.tie(0);
int n;
cin>>n;
pair<int,int>a[n+1];
int pref[n+1];
pref[0]=0;
for(int i=1;i<=n;i++){
int u,v;
cin>>u>>v;
a[i]={u,v};
}
sort(a+1,a+n+1);
for(int i=1;i<=n;++i)pref[i]=pref[i-1]+a[i].second;
int ans=0;
for(int i=1;i<=n;i++){
for(int j=i+1;j<=n;j++){
ans=max(ans,(pref[j]-pref[i-1])-(a[j].first-a[i].first));
}
}
cout<<ans;
}
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