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Submission #382561

# Submission time Handle Problem Language Result Execution time Memory
382561 2021-03-27T16:36:12 Z Mahdi_Shokoufi Pipes (CEOI15_pipes) C++17
90 / 100
 1355 ms 22332 KB 
//In the name of Allah
#include <bits/stdc++.h>

using namespace std;

#define pb push_back

const int N = 1e5 + 10;

int par[2][N], mark[N];
vector < int > adj[N];

int getPar(int t, int v){
    return par[t][v] == v ? v : par[t][v] = getPar(t, par[t][v]);
}

bool merge(int t, int u, int v){
    u = getPar(t, u); v = getPar(t, v);
    if (u == v)
        return false;
    par[t][u] = v;
    return true;
}

void DFS(int v, int p = 0){
    mark[v] = 1;
    par[1][v] = N;
    int cnt = 0;
    for (int u : adj[v]){
        if (u == p){
            cnt ++;
            continue;
        }
        if (mark[u])
            par[1][v] = min(par[1][v], par[0][u]);
        else{
            par[0][u] = par[0][v] + 1;
            DFS(u, v);
            par[1][v] = min(par[1][v], par[1][u]);
        }
    }
    if (p && cnt == 1 && par[0][p] < par[1][v])
        cout << p << ' ' << v << '\n';
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < N; i ++)
        par[0][i] = par[1][i] = i;
    for (int i = 0; i < m; i ++){
        int u, v;
        cin >> u >> v;
        if (merge(0, u, v)){
            adj[u].pb(v);
            adj[v].pb(u);
        }
        else if (merge(1, u, v)){
            adj[u].pb(v);
            adj[v].pb(u);
        }
    }
    for (int v = 1; v <= n; v ++)
        adj[v].shrink_to_fit();
    memset(par, 0, sizeof par);
    for (int v = 1; v <= n; v ++)
        if (!mark[v])
            DFS(v);
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3436 KB Output is correct
2 Correct 3 ms 3436 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 3948 KB Output is correct
2 Correct 8 ms 3692 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 112 ms 3820 KB Output is correct
2 Correct 108 ms 3692 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 195 ms 4328 KB Output is correct
2 Correct 216 ms 4076 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 314 ms 5996 KB Output is correct
2 Correct 276 ms 5744 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 500 ms 10804 KB Output is correct
2 Correct 421 ms 7532 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 712 ms 11748 KB Output is correct
2 Correct 652 ms 8904 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 938 ms 13676 KB Output is correct
2 Correct 903 ms 8816 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1153 ms 13932 KB Output is correct
2 Correct 1036 ms 8836 KB Output is correct

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1355 ms 13588 KB Output is correct
2 Runtime error 1261 ms 22332 KB Memory limit exceeded