제출 #897419

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
897419		Muhammad_Aneeq	꿈 (IOI13_dreaming)	C++17	32 / 100	56 ms	15820 KiB

dreaming

#include <vector>
#include <algorithm>
#include <queue>
#include "dreaming.h"
using namespace std;
int const N=1e5+10;
vector<pair<int,int>>nei[N]={};
vector<int>heads;
int vis[N]={};
int cost[N]={};
void dfs(int n)
{
	vis[n]=1;
	for (auto [i,w]:nei[n])
	{
		if (!vis[i])
		{
			cost[n]+=w;
			dfs(i);
			cost[n]+=cost[i];
		}
	}
}
vector<pair<int,int>>cur={};
bool w1=0;
void getroot(int n,int pa,int root)
{
	int f=cost[root]-cost[n];
	for (auto [i,w]:nei[n])
	{
		if (i!=pa)
		{
			f=max(f,cost[i]+w);
			getroot(i,n,root);
		}
		else
			f=max(f,cost[root]-cost[n]);
	}
	cur.push_back({f,n});
}
void bfs(int n)
{
	queue<pair<int,int>>Q;
	Q.push({n,-1});
	while (Q.size())
	{
		int n,m;
		tie(n,m)=Q.front();
		Q.pop();
		for (auto [i,w]:nei[n])
		{
			if (i!=m)
			{
				cost[i]=cost[n]+w;
				Q.push({i,n});
			}
		}
	}
}
int travelTime(int n, int m, int l, int a[], int b[], int t[])
{
	int f=0;
	for (int i=0;i<m;i++)
	{
		f+=t[i];
		nei[a[i]].push_back({b[i],t[i]});
		nei[b[i]].push_back({a[i],t[i]});
	}
	for (int i=0;i<n;i++)
	{
		if (!vis[i])
		{
			heads.push_back(i);
			dfs(i);
		}
	}
	for (int i=0;i<n;i++)
		vis[i]={};
	vector<pair<int,int>>new_head;
	for (auto i:heads)
	{
		getroot(i,-1,i);
		sort(begin(cur),end(cur));
		new_head.push_back(cur[0]);
		cur={};
	}
	sort(begin(new_head),end(new_head));
	reverse(begin(new_head),end(new_head));
	for (int i=1;i<new_head.size();i++)
	{
		nei[new_head[0].second].push_back({new_head[i].second,l});
		nei[new_head[i].second].push_back({new_head[0].second,l});
		f+=l;
	}
	for (int i=0;i<n;i++)
		cost[i]=0;
	bfs(0);
	w1=0;
	new_head={};
	for (int i=0;i<n;i++)
	{
		new_head.push_back({cost[i],i});
		cost[i]=0;
	}
	sort(begin(new_head),end(new_head));
	reverse(begin(new_head),end(new_head));
	w1=1;
	bfs(new_head[0].second);
	new_head={};
	for (int i=0;i<n;i++)
	{
		new_head.push_back({cost[i],i});
		cost[i]=0;
	}
	sort(begin(new_head),end(new_head));
	reverse(begin(new_head),end(new_head));
	return new_head[0].first;
}

컴파일 시 표준 에러 (stderr) 메시지

dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:89:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |  for (int i=1;i<new_head.size();i++)
      |               ~^~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 18 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23