#include<bits/stdc++.h> using namespace std; #define pb push_back #define ll long long #define pll pair<ll,ll> #define ff first #define ss second #define endl "\n" const ll maxn=5e5+50; const ll mod =1e9+7; const ll base=113; pll a[maxn]; ll f[maxn]; int main() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); if (fopen("GIDDY.inp", "r")) { freopen("GIDDY.inp", "r", stdin); freopen("GIDDY.out", "w", stdout) ; } ll n; cin>>n ; for (int i=1;i<=n;i++) { cin>>a[i].ff>>a[i].ss; } sort(a+1,a+n+1); ll ans=0; ll nw=0; ll mx=-1e15; for (int i=1;i<=n;i++) { ans=max(ans,a[i].ss); ll pre=nw; nw+=a[i].ss; ans=max(ans,nw-a[i].ff+mx); mx=max(mx,-pre+a[i].ff); } cout <<ans; }

art.cpp: In function 'int main()':
art.cpp:26:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   26 |         freopen("GIDDY.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
art.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   27 |         freopen("GIDDY.out", "w", stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~