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 int long long
signed main() {
ios::sync_with_stdio(0);
cin.tie(0);
int n; cin >> n;
pair<int,int> a[n];
for(int i=0; i<n; ++i) cin >> a[i].first >> a[i].second;
sort(a,a+n);
int curr=0,mn=1e18,ans=a[0].second;
for(int i=0; i<n; ++i) {
curr += a[i].second;
ans=max(ans,curr-mn-a[i].first);
mn=min(mn,curr-a[i].second-a[i].first);
}
cout << ans;
}
/*
6
4 1
1 5
10 3
9 1
4 2
5 3
*/
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