Submission #546478

#	Time	Username	Problem	Language	Result	Execution time	Memory
546478		Pherokung	Teleporters (IOI08_teleporters)	C++14	100 / 100	325 ms	34876 KiB

teleporters

#include<bits/stdc++.h>
using namespace std;
int n,m,a,b,tp[2000005],vis[2000005],pos,ans,cnt; 
priority_queue<int> pq;
queue<int> q;
vector<int> v;
int main(){
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++){
		scanf("%d%d",&a,&b);
		tp[a] = b;
		tp[b] = a;
	}
	ans = 0;
	vis[2000001] = 1;
	pos = 1;
	while(vis[pos] == 0){
		vis[pos] = 1;
		if(tp[pos] != 0){
			pos = tp[pos] + 1;
			ans++;
		}
		else pos++;
	}
	for(int i=1;i<=2000000;i++){
		if(vis[i] == 0){
			pos = i;
			cnt = 0;
			while(vis[pos] == 0){
				vis[pos] = 1;
				if(tp[pos] != 0){
					pos = tp[pos] + 1;
					cnt++;
				}
				else pos++;
			}
			pq.push(cnt+2);
		}
	}
	
	while(!pq.empty() && m > 0){
		//printf("TT %d\n",pq.top());
		ans += pq.top();
		pq.pop();
		m--;
	}
	
	ans += 4 * (m/2) + m % 2;
	printf("%d",ans);
}

Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:8:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
teleporters.cpp:10:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |   scanf("%d%d",&a,&b);
      |   ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
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• Subtask 20: 5 / 5