Submission #460545

#	Time	Username	Problem	Language	Result	Execution time	Memory
460545		BT21tata	악어의 지하 도시 (IOI11_crocodile)	C++17	0 / 100	2 ms	3404 KiB

crocodile

#include<bits/stdc++.h>
#include "crocodile.h"
typedef long long ll;

using namespace std;

vector<pair<ll,ll> >g[100005];
priority_queue<pair<ll,ll> >q;
ll dis[100005], ans;
bool used[100005], ext[100005];

ll check(int v)
{
    if(ext[v]) return -1;
    ll mx=0, cnt=0;
    for(pair<ll, ll> u : g[v])
    {
        if(ext[u.first]) cnt++, mx=max(mx, dis[u.first]); 
    }
    if(cnt<2) return -1;
    return mx;
}

int travel_plan(int n, int m, int R[][2], int L[], int k, int P[])
{
    memset(dis, 63, sizeof(dis));
    for(int i=0; i<m; i++)
    {
        g[R[i][0]].push_back({R[i][1], L[i]});
        g[R[i][1]].push_back({R[i][0], L[i]});
    }
    for(int i=0; i<k; i++)
        ext[P[i]]=1;
    q.push({0, 0});
    dis[0]=0;
    while(!q.empty())
    {
        int s=q.top().second;
        q.pop();
        if(used[s]) continue;
        used[s]=1;
        for(pair<ll, ll> u : g[s])
        {
            if(dis[s]+u.second<dis[u.first])
            {
                dis[u.first]=dis[s]+u.second;
                q.push({-dis[u.first], u.first});   
            }
        }
    }

    for(int i=0; i<n; i++)
    {
        ans=max(ans, check(i));
    }
    return ans;
}


/*
5 4 3
0 1 2
0 2 3
3 2 1
2 4 4
1 3 4
7

*/

• Subtask 1: 0 / 46
• Subtask 2: 0 / 43
• Subtask 3: 0 / 11