#include <bits/stdc++.h> using namespace std; #define mp make_pair #define pb push_back typedef long long int LLI; typedef vector<int> vi; typedef pair<int,int> pii; typedef vector<pii> vpii; pair<LLI,int> p[500000]; int main() { int i; int N; scanf("%d",&N); for (i = 0; i < N; i++) scanf("%lld %d",&p[i].first,&p[i].second); sort(p,p+N); LLI best = 0,sum = p[0].second; for (i = 1; i < N; i++) { sum -= p[i].first-p[i-1].first,sum = max(sum,0LL); sum += p[i].second,best = max(best,sum); } printf("%lld\n",best); return 0; }

art.cpp: In function 'int main()':
art.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&N);
     ~~~~~^~~~~~~~~
art.cpp:15:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (i = 0; i < N; i++) scanf("%lld %d",&p[i].first,&p[i].second);
                             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~