Submission #1111591

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111591		zhehan	Fire (BOI24_fire)	C++14	0 / 100	1 ms	504 KiB

Main

#include <bits/stdc++.h>

using namespace std;

typedef pair<int,int> ii;


int main()
{
    int n,m,day_start=0,day_end,a,b;
    cin>>n>>m;
    day_end=m;
    vector<ii> shifts;
    for(int i=0;i<n;++i){
        cin>>a>>b;
        if(a>b){
            a-=day_end;
            shifts.push_back(ii(a,b));
        }else{
            shifts.push_back(ii(a,b));
        }
    }
    sort(shifts.begin(),shifts.end());
    priority_queue<ii,vector<ii>> pq;
    int pointer=0;
    int counter=0;
    while(day_start<day_end&&pointer<n){
        while(pointer<n&&shifts.at(pointer).first<=day_start){
            pq.push(ii(shifts.at(pointer).second,shifts.at(pointer).first));
            ++pointer;
        }
        if(pq.empty()){
            break;
        }
        day_start=max(day_start,pq.top().first);
        if(pq.top().second<0){
            day_end=min(day_end,m+pq.top().second);
        }
        ++counter;
        pq.pop();
    }
    if(day_start<day_end){
        cout<<-1<<'\n';
        return 0;
    }
    cout<<counter<<'\n';
    return 0;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 17
• Subtask 3: 0 / 9
• Subtask 4: 0 / 13
• Subtask 5: 0 / 21
• Subtask 6: 0 / 26