Submission #1124594

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124594		knot222	Crocodile's Underground City (IOI11_crocodile)	C++20	46 / 100	2 ms	836 KiB

crocodile

#include "crocodile.h"
#include <bits/stdc++.h>
#define ll long long int
using namespace std;
int ex[10005];
ll dp[10005][2];
int par[10005];
int visited[10005];
vector<pair<int,ll>> adj[10005];
void dfs(int n) {
    visited[n] = 1;
    for (auto u : adj[n]) {
        if (!visited[u.first]) {
            dfs(u.first);
        } else {
            par[n] = u.first;
        }
    }
    dp[n][0] = LLONG_MAX/2;
    dp[n][1] = LLONG_MAX/2;
    if (ex[n]) {
        dp[n][0] = 0;
        dp[n][1] = 0;
    } else {
        for (auto u : adj[n]) {
            int X = u.first;
            if (X!=par[n]) {
                if (dp[n][1]>dp[X][1]+u.second) {
                    dp[n][1] = dp[X][1]+u.second;
                    if (dp[n][0]>dp[n][1]) {
                        swap(dp[n][0], dp[n][1]);
                    }
                }
            }
        }        
    }
}
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
    for (int i=0;i<N;i++) {
        par[i] = -1;
    }
    for (int i=0;i<K;i++) {
        ex[P[i]] = 1;
    }
    for (int i=0;i<M;i++) {
        adj[R[i][0]].push_back(make_pair(R[i][1], L[i]));
        adj[R[i][1]].push_back(make_pair(R[i][0], L[i]));
    }
    dfs(0);
    return dp[0][1];
}

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