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Submission #97602

# Submission time Handle Problem Language Result Execution time Memory
97602 2019-02-17T12:22:05 Z dalgerok Pipes (CEOI15_pipes) C++17
100 / 100
 1290 ms 14040 KB 
#include<bits/stdc++.h>
using namespace std;


const int N = 1e5 + 5;



int n, m;
int p[2][N];
int tin[N], fup[N], timer;
vector < int > g[N];

int dsu_get(int x, int v){
    return p[x][v] == v ? v : p[x][v] = dsu_get(x, p[x][v]);
}

void dfs(int v, int pr = 0){
    tin[v] = fup[v] = ++timer;
    bool was = false;
    for(int i = 0; i < (int)g[v].size(); i++){
        int to = g[v][i];
        if(to == pr){
            if(was){
                fup[v] = min(fup[v], tin[to]);
            }
            was = true;
            continue;
        }
        if(!tin[to]){
            dfs(to, v);
            if(fup[to] > tin[v]){
                cout << v << " " << to << "\n";
            }
            fup[v] = min(fup[v], fup[to]);
        }
        else{
            fup[v] = min(fup[v], tin[to]);
        }
    }

}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= n; i++){
        p[0][i] = p[1][i] = i;
    }
    for(int i = 1; i <= m; i++){
        int x, y;
        cin >> x >> y;
        if(dsu_get(0, x) == dsu_get(0, y)){
            if(dsu_get(1, x) == dsu_get(1, y)){
                continue;
            }
            p[1][dsu_get(1, x)] = dsu_get(1, y);
        }
        else{
            p[0][dsu_get(0, x)] = dsu_get(0, y);
        }
        g[x].push_back(y);
        g[y].push_back(x);
    }
    for(int i = 1; i <= n; i++){
        if(!tin[i]){
            dfs(i);
        }
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2688 KB Output is correct
2 Correct 4 ms 2688 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 3200 KB Output is correct
2 Correct 7 ms 2944 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 3064 KB Output is correct
2 Correct 97 ms 2936 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 168 ms 3724 KB Output is correct
2 Correct 199 ms 3324 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 311 ms 5368 KB Output is correct
2 Correct 250 ms 5020 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 422 ms 10592 KB Output is correct
2 Correct 371 ms 7128 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 649 ms 11860 KB Output is correct
2 Correct 636 ms 8964 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 858 ms 14040 KB Output is correct
2 Correct 815 ms 9104 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1108 ms 14036 KB Output is correct
2 Correct 1038 ms 9068 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1290 ms 13416 KB Output is correct
2 Correct 1264 ms 10628 KB Output is correct