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Submission #839590

# Submission time Handle Problem Language Result Execution time Memory
839590 2023-08-30T10:02:58 Z kyaruru Pipes (CEOI15_pipes) C++17
0 / 100
 1447 ms 65536 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

vector<int> adj[100001];
vector<int> tin(100001,-1),low(100001,-1);
vector<pii> ans;
bool vi[100001];
int t=0;


void dfs(int x,int p=-1){
    vi[x]=true;
    tin[x]=low[x]=t++;
    for(int u:adj[x]){
        if(u==p) continue;
        if(vi[u]){
            low[x]=min(low[x],tin[u]);
        }else{
            dfs(u,x);
            low[x]=min(low[x],low[u]);
            if(low[u]>tin[x]) ans.push_back({min(u,x),max(u,x)});
        }
    }
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int a,b;
    cin>>a>>b;

    for(int i=0; i<b; i++){
        int x,y;
        cin>>x>>y;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }

    for(int i=1; i<=a; i++){
        if(!vi[i]) dfs(i);
    }
    sort(ans.begin(), ans.end());
    cout<<ans.size()<<"\n";
    for(pii u:ans) cout<<u.first<<" "<<u.second<<"\n";
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 3412 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 4052 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 82 ms 17052 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 158 ms 24584 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 305 ms 41964 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 476 ms 52416 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 787 ms 65536 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1062 ms 65536 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1447 ms 65536 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1380 ms 65536 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -