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Submission #948773

# Submission time Handle Problem Language Result Execution time Memory
948773 2024-03-18T13:56:30 Z Aiperiii Pipes (CEOI15_pipes) C++14
40 / 100
 2403 ms 31272 KB 
#include <bits/stdc++.h>
//#define int long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
using namespace std;
const int N=1e5+5;
int p[2][N],vis[N],tin[N],low[N];
vector <int> g[N];
int find_set(int i,int v){
    if(p[i][v]==v)return v;
    return p[i][v]=find_set(i,p[i][v]);
}
bool union_set(int i,int u,int v){
    if(find_set(i,u)==find_set(i,v))return false;
    p[i][u]=v;
    return true;
}
int t=0;
void dfs(int v,int p){
    vis[v]=1;
    t++;
    tin[v]=t;
    low[v]=t;
    bool ok=0;
    for(auto to : g[v]){
        if(p==to && !ok)ok=1;
        else if(vis[to])low[v]=min(low[v],tin[to]);
        else{
            dfs(to,v);
            low[v]=min(low[v],low[to]);
            if(low[to]>tin[v]){
                cout<<v<<" "<<to<<"\n";
            }
        }
    }
}
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);cout.tie(0);
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        p[0][i]=i;
        p[1][i]=i;
    }
    int u,v;
    for(int i=0;i<m;i++){
        cin>>u>>v;
        if(union_set(0,u,v)){
            g[u].pb(v);
            g[v].pb(u);
        }
        else if(union_set(1,u,v)){
            g[u].pb(v);
            g[v].pb(u);
        }
    }
    for(int i=1;i<=n;i++){
        if(!vis[i])dfs(i,0);
    }
}

/*

 */

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4696 KB Output is correct
2 Correct 1 ms 4700 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5208 KB Output is correct
2 Correct 8 ms 4952 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 206 ms 5456 KB Output is correct
2 Correct 187 ms 5036 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 350 ms 7044 KB Output is correct
2 Correct 399 ms 6056 KB Output is correct

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 541 ms 10604 KB Output is correct
2 Runtime error 502 ms 22276 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 882 ms 25664 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1237 ms 26048 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1664 ms 31272 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2021 ms 31264 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2403 ms 30780 KB Memory limit exceeded
2 Halted 0 ms 0 KB -