Submission #254631

#	Time	Username	Problem	Language	Result	Execution time	Memory
254631		Sorting	Crocodile's Underground City (IOI11_crocodile)	C++14	0 / 100	2 ms	2816 KiB

crocodile

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

using namespace std;

const int k_N = 1e5 + 3;
const int k_Inf = 1e9;

int n, m, k;
vector<pair<int, int>> adj[k_N];

bool e[k_N];

pair<int, int> d[k_N];
bool in_q[k_N];

void spfa(){
    queue<int> q;

    for(int i = 0; i < n; ++i){
        in_q[i] = false;
        d[i] = {k_Inf, k_Inf};
    }

    for(int i = 0; i < n; ++i){
        if(e[i]){
            q.push(i);
            in_q[i] = true;
            d[i] = {0, 0};
        }
    }

    while(!q.empty()){
        int u = q.front();
        q.pop();

        in_q[u] = false;
        //cout << u << " - " << d[u].first << " " << d[u].second << "\n";

        for(auto [to, c]: adj[u]){
            int new_d = d[u].second + c;
            if(d[to].second > new_d){
                d[to].second = new_d;
                if(d[to].first > d[to].second)
                    swap(d[to].first, d[to].second);

                if(!in_q[to] && d[to].second != k_Inf){
                    in_q[to] = true;
                    q.push(to);
                }
            }
        }
    }
}

int travel_plan(int N, int M, int R[][2], int L[], int K, int P[]){
    n = N;
    m = M;
    k = K;

    for(int i = 0; i < m; ++i){
        adj[R[i][0]].push_back({R[i][1], L[i]});
        adj[R[i][1]].push_back({R[i][0], L[i]});
    }

    for(int i = 0; i < k; ++i)
        e[P[i]] = true;

    spfa();

    return d[0].second;
}

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

Compilation message (stderr)

crocodile.cpp: In function 'void spfa()':
crocodile.cpp:40:18: warning: decomposition declaration only available with -std=c++1z or -std=gnu++1z
         for(auto [to, c]: adj[u]){
                  ^

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