Submission #73367881

Source Code Expand

#include <cstdio>
#include <algorithm>
using namespace std;
pair<int,int> p[200005];
int main()
{
	int n,m,now,pos,mx,ans;
	scanf("%d%d",&n,&m);
	for(int i=1;i<=m;i++)
		scanf("%d%d",&p[i].first,&p[i].second);
	sort(p+1,p+m+1);
	now=0;
	pos=1;
	ans=0;
	while(now<n)
	{
		mx=now;
		while(pos<=m&&p[pos].first<=now+1)
			mx=max(mx,p[pos++].second);
		if(mx==now)
		{
			ans=-1;
			break;
		}
		ans++;
		now=mx;
	}
	printf("%d\n",ans);
	return 0;
}

Submission Info

Submission Time
Task D - Placement of Security Guards
User Darko2026
Language C++23 (GCC 15.2.0)
Score 400
Code Size 474 Byte
Status AC
Exec Time 36 ms
Memory 3376 KiB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 3
AC × 64
Set Name Test Cases
Sample sample01.txt, sample02.txt, sample03.txt
All sample01.txt, sample02.txt, sample03.txt, in01.txt, in02.txt, in03.txt, in04.txt, in05.txt, in06.txt, in07.txt, in08.txt, in09.txt, in10.txt, in11.txt, in12.txt, in13.txt, in14.txt, in15.txt, in16.txt, in17.txt, in18.txt, in19.txt, in20.txt, in21.txt, in22.txt, in23.txt, in24.txt, in25.txt, in26.txt, in27.txt, in28.txt, in29.txt, in30.txt, in31.txt, in32.txt, in33.txt, in34.txt, in35.txt, in36.txt, in37.txt, in38.txt, in39.txt, in40.txt, in41.txt, in42.txt, in43.txt, in44.txt, in45.txt, in46.txt, in47.txt, in48.txt, in49.txt, in50.txt, in51.txt, in52.txt, in53.txt, in54.txt, in55.txt, in56.txt, in57.txt, in58.txt, in59.txt, in60.txt, in61.txt
Case Name Status Exec Time Memory
in01.txt AC 1 ms 1612 KiB
in02.txt AC 1 ms 1508 KiB
in03.txt AC 1 ms 1676 KiB
in04.txt AC 1 ms 1604 KiB
in05.txt AC 1 ms 1604 KiB
in06.txt AC 1 ms 1596 KiB
in07.txt AC 1 ms 1536 KiB
in08.txt AC 1 ms 1520 KiB
in09.txt AC 33 ms 3260 KiB
in10.txt AC 34 ms 3376 KiB
in11.txt AC 24 ms 3336 KiB
in12.txt AC 35 ms 3276 KiB
in13.txt AC 21 ms 3200 KiB
in14.txt AC 17 ms 3148 KiB
in15.txt AC 21 ms 3268 KiB
in16.txt AC 20 ms 3112 KiB
in17.txt AC 20 ms 3216 KiB
in18.txt AC 23 ms 3320 KiB
in19.txt AC 1 ms 1500 KiB
in20.txt AC 33 ms 3320 KiB
in21.txt AC 33 ms 3224 KiB
in22.txt AC 1 ms 1676 KiB
in23.txt AC 1 ms 1560 KiB
in24.txt AC 1 ms 1620 KiB
in25.txt AC 1 ms 1536 KiB
in26.txt AC 1 ms 1508 KiB
in27.txt AC 24 ms 3224 KiB
in28.txt AC 1 ms 1556 KiB
in29.txt AC 1 ms 1500 KiB
in30.txt AC 1 ms 1604 KiB
in31.txt AC 1 ms 1596 KiB
in32.txt AC 1 ms 1612 KiB
in33.txt AC 1 ms 1556 KiB
in34.txt AC 1 ms 1560 KiB
in35.txt AC 1 ms 1656 KiB
in36.txt AC 1 ms 1672 KiB
in37.txt AC 1 ms 1540 KiB
in38.txt AC 35 ms 3156 KiB
in39.txt AC 34 ms 3320 KiB
in40.txt AC 24 ms 3056 KiB
in41.txt AC 1 ms 1504 KiB
in42.txt AC 1 ms 1596 KiB
in43.txt AC 36 ms 3164 KiB
in44.txt AC 36 ms 3276 KiB
in45.txt AC 1 ms 1612 KiB
in46.txt AC 1 ms 1612 KiB
in47.txt AC 1 ms 1656 KiB
in48.txt AC 1 ms 1612 KiB
in49.txt AC 1 ms 1544 KiB
in50.txt AC 1 ms 1596 KiB
in51.txt AC 1 ms 1656 KiB
in52.txt AC 1 ms 1596 KiB
in53.txt AC 25 ms 3268 KiB
in54.txt AC 31 ms 3200 KiB
in55.txt AC 1 ms 1688 KiB
in56.txt AC 1 ms 1560 KiB
in57.txt AC 1 ms 1656 KiB
in58.txt AC 1 ms 1536 KiB
in59.txt AC 1 ms 1620 KiB
in60.txt AC 1 ms 1508 KiB
in61.txt AC 1 ms 1604 KiB
sample01.txt AC 1 ms 1508 KiB
sample02.txt AC 1 ms 1676 KiB
sample03.txt AC 1 ms 1604 KiB