#include <bits/stdc++.h> #define ii pair<int, int> #define fi first #define se second #define inf 0x3f3f3f3f3f3f3f3f using namespace std; using ll = long long; const ll mod=1e9+7; const int nx=1e7+5; int n, ans=0, cur=-1, x, y; stack<ii> st; ii p; bool ok; void fastscan(int &x) { bool neg=false; register int c; x =0; c=getchar(); if(c=='-') { neg = true; c=getchar(); } for(;(c>47 && c<58);c=getchar()) x = (x<<1) + (x<<3) +c -48; if(neg) x *=-1; } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin>>n; while(n--) { fastscan(x); fastscan(y); ok=1; while(st.size()) { p=st.top(); if(x-p.fi<=p.se-y) { ok=0; break; } if(x-p.fi<=y-p.se) st.pop(); else break; } if(ok) st.push({x, y}); } cout<<st.size(); }

Main.cpp: In function 'void fastscan(int&)':
Main.cpp:17:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   17 |     register int c;
      |                  ^