Submission #1093760

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093760		Aviansh	Crocodile's Underground City (IOI11_crocodile)	C++17	89 / 100	2058 ms	247672 KiB

crocodile

#include <bits/stdc++.h>
#include "crocodile.h"

using namespace std;

int travel_plan(int n, int m, int edges[][2], int w[], int k, int p[])
{
    unordered_map<int,int> g[n];
    unordered_map<int,int>index[n];
    for(int i =0;i<m;i++){
        g[edges[i][0]][edges[i][1]]=w[i];
        g[edges[i][1]][edges[i][0]]=w[i];
        index[edges[i][0]][edges[i][1]]=i;
        index[edges[i][1]][edges[i][0]]=i;
    }
    bool ex[n];
    bool rem[n];
    bool vis[n];
    fill(rem,rem+n,0);
    fill(ex,ex+n,0);
    fill(vis,vis+n,0);
    set<tuple<int, int, int>> pq; // dist, destination, origin
    unordered_map<int,int> mp;
    for(int i = 0;i<k;i++){
        vis[p[i]]=1;
        ex[p[i]]=1;
    }
    for(int i = 0;i<k;i++){
        for(pair<int,int>pa : g[p[i]]){
            if(vis[pa.first]) continue;
            pq.insert(make_tuple(pa.second, pa.first, p[i]));
        }
    }
    while(!pq.empty()){
        tuple<int, int, int> a = *(pq.begin());
        pq.erase(pq.begin());
        if(vis[get<1>(a)]){
            continue;
        }
        if(rem[get<1>(a)]){
            for(pair<int,int>p : g[get<1>(a)]){
                if(vis[p.first]) continue;
                if(mp[index[get<1>(a)][p.first]] != 0 && mp[index[get<1>(a)][p.first]] > get<0>(a) + p.second){
                    pq.erase(make_tuple(mp[index[get<1>(a)][p.first]], p.first, get<1>(a)));
                }
                pq.insert(make_tuple(get<0>(a) + p.second, p.first, get<1>(a)));
                mp[index[get<1>(a)][p.first]] = get<0>(a) + p.second;
            }
            vis[get<1>(a)] = 1;
        }
        else{
            // cout << "removing edge: " << get<1>(a) << " " << get<2>(a) << "\n";
            g[get<1>(a)].erase(get<2>(a));
            rem[get<1>(a)] = 1;
        }
    }
    fill(vis,vis+n,0);
    pq.insert(make_tuple(0, 0, -1));
    vis[0] = 1;
    while(!pq.empty()){
        tuple<int, int, int> a = *(pq.begin());
        pq.erase(pq.begin());
        vis[get<1>(a)] = 1;
        if(ex[get<1>(a)]) return get<0>(a);
        for(pair<int,int>p : g[get<1>(a)]){
            if(vis[p.first]) continue;
            pq.insert(make_tuple(p.second + get<0>(a), p.first, get<1>(a)));
        }
    }
    return -1;
}

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