#include "bits/stdc++.h" using namespace std; #define int long long const int N = 5e5+7; struct picture { int a, b; } d[N]; int n, ps[N], f[N]; bool cmp(picture x, picture y){ if(x.a == y.a) return x.b < y.b; return x.a < y.a; } signed main(){ ios_base::sync_with_stdio(0); cin.tie(0); freopen("TL.INP", "r", stdin); freopen("TL.OUT", "w", stdout); cin>>n; for(int i = 1; i <= n; i++){ cin>>d[i].a>>d[i].b; } sort(d+1, d+n+1, cmp); int res = 0; for(int i = 1; i <= n; i++){ ps[i] = ps[i-1]+d[i].b; f[i] = max(f[i-1], d[i].a-ps[i-1]); res = max(ps[i]-d[i].a+f[i], res); } cout<<res; }

art.cpp: In function 'int main()':
art.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen("TL.INP", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
art.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen("TL.OUT", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~