제출 #1191501

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1191501		laure	Fire (BOI24_fire)	C++20	0 / 100	2094 ms	328 KiB

Main

#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,m;
    cin>>n>>m;
    vector<pair<int,int>>v(n);
    for(int i=0;i<n;i++)cin>>v[i].first>>v[i].second;
    sort(v.begin(),v.end());
    if(v[0].first!=0){cout<<-1<<'\n';return 0;}
    int i=0,mx=v[0].second;
    while(v[i+1].first==0)
    {
        i++;
        mx=max(v[i].second,mx);
    }
    int ans=1;
    bool b=1;
    while(v[i].second!=0&&i<n)
    {
        int mx1=mx;
        if(v[i+1].first>mx){b=0;break;}
        while(v[i+1].first<=mx1&&i+1<n)
        {
            i++;
            mx=max(mx,v[i].second);
        }
        ans++;
    }
    if(b)cout<<ans<<'\n';
    else cout<<-1<<'\n';
}

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