Submission #575261

#	Time	Username	Problem	Language	Result	Execution time	Memory
575261		srivatsav_kannan	Commuter Pass (JOI18_commuter_pass)	C++14	0 / 100	680 ms	43516 KiB

commuter_pass

#include <iostream>
#include <iomanip>
#include <array>
#include <fstream>
#include <vector>
#include <set>
#include <queue>
#include <cmath>
#include <map>
#include <algorithm>
#include <numeric>
#include <stack>
#include <cstring>
#include <bitset>
#include <climits>
#include <valarray>
#include <list>
#include<functional>
#define int long long int
#define inf 10000000000000
#define endl '\n'
#define mod 1000000007
using namespace std;
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//using namespace __gnu_pbds;
//typedef tree<
//int,
//null_type,
//greater_equal<int>,
//rb_tree_tag,
//tree_order_statistics_node_update>
//ordered_set;
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);
    cout.tie(0);
    int n,m; cin >> n >> m;
    int s,t; cin >> s >> t;
    int uu,vv; cin >> uu >> vv;
    map<pair<int,int>, bool> mp;
    vector<pair<int,int>> adj[n+1];
    int vis[n+1], dist[n+1], prev[n+1];
    for (int i = 0; i < m; i++){
        int u,v,w; cin >> u >> v >> w;
        adj[u].push_back({v,w});
        adj[v].push_back({u,w});
    }
    for (int i = 1; i <= n; i++){
        vis[i] = 0;
        dist[i] = inf;
        prev[i] = -1;
    }
    priority_queue<pair<int,int>, vector<pair<int,int>>, greater<pair<int,int>>> pq;
    pq.push({0,s});
    dist[s] = 0;
    while (!pq.empty()) {
        int cur = pq.top().second;
        int cur_d = pq.top().first;
        pq.pop();
        if (vis[cur]) continue;
        vis[cur] = 1;
        for (auto child:adj[cur]){
            if (cur_d+child.second < dist[child.first]){
                dist[child.first] = cur_d+child.second;
                prev[child.first] = cur;
                pq.push({dist[child.first], child.first});
            }
        }
    }
    int cur = t;
    while (prev[cur] != -1){
        mp[{cur, prev[cur]}] = mp[{prev[cur], cur}] = 1;
        cout << cur << " " << prev[cur] << endl;
        cur = prev[cur];
        if (cur == s) break;
    }
    
    
    for (int i = 1; i <= n; i++){
        cout << dist[i] << " ";
        vis[i] = 0;
        dist[i] = inf;
        prev[i] = -1;
    }
    cout << endl;
    pq.push({0,uu});
    dist[uu] = 0;
    while (!pq.empty()) {
        int cur = pq.top().second;
        int cur_d = pq.top().first;
        pq.pop();
        if (vis[cur]) continue;
        vis[cur] = 1;
        for (auto child:adj[cur]){
            if (mp[{child.first, cur}]) child.second = 0;
            if (cur_d+child.second < dist[child.first]){
                dist[child.first] = cur_d+child.second;
                prev[child.first] = cur;
                pq.push({dist[child.first], child.first});
            }
        }
    }
    cout << dist[vv] << endl;
    return 0;
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45