제출 #790760

#제출 시각아이디문제언어결과실행 시간메모리
790760cig32Advertisement 2 (JOI23_ho_t2)C++17
100 / 100
502 ms49780 KiB
#include "bits/stdc++.h" using namespace std; #define int long long const int MAXN = 5e5 + 10; const int MOD = 1e9 + 7; mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count()); int rnd(int x, int y) { int u = uniform_int_distribution<int>(x, y)(rng); return u; } int bm(int b, int p) { if(p==0) return 1 % MOD; int r = bm(b, p >> 1); if(p&1) return (((r*r) % MOD) * b) % MOD; return (r*r) % MOD; } int inv(int b) { return bm(b, MOD-2); } int fastlog(int x) { return (x == 0 ? -1 : 64 - __builtin_clzll(x) - 1); } void printcase(int i) { cout << "Case #" << i << ": "; } void solve(int tc) { int n; cin>>n; set<pair<int,int>>st; for(int i=1;i<=n;i++){ int x,y; cin>>x>>y; st.insert({x,y}); } vector<pair<int,int>>vt; for(pair<int,int>k:st)vt.push_back(k); int l=vt.size(); bool have[l]; for(int i=0;i<l;i++)have[i]=0; int ma=0; for(int i=0;i<l;i++){ if(ma>=vt[i].first+vt[i].second)have[i]=1; ma=max(ma,vt[i].first+vt[i].second); } int mi=1e18; for(int i=l-1;i>=0;i--){ if(mi<=vt[i].first-vt[i].second)have[i]=1; mi=min(mi,vt[i].first-vt[i].second); } int s=0; for(int i=0;i<l;i++)s+=have[i]; cout<<l-s<<'\n'; } int32_t main() { ios::sync_with_stdio(0); cin.tie(0); int t = 1; //cin >> t; for(int i=1; i<=t; i++) solve(i); } // 勿忘初衷
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