Submission #527156

#	Time	Username	Problem	Language	Result	Execution time	Memory
527156		ecxx	Pipes (CEOI15_pipes)	C++17	10 / 100	3826 ms	65540 KiB

pipes

#include <bits/stdc++.h>
using namespace std;
    
int N;
vector<int> depth;
vector<int> low;
vector<vector<int> > AL;
void AP(int i, int d, int pa) {
    depth[i] = d; low[i] = d;
    
    for (int ch : AL[i]) {
        if (ch==pa) continue;
        if (depth[ch] > -1) {
            low[i] = min(low[i], depth[ch]);
        } else {
            AP(ch, d+1, i);
            low[i] = min(low[i], low[ch]);
        }
    }
    if (low[i] == depth[i] && pa!=-1) {
        cout << i+1 << " " << pa+1 << "\n";
    }
}
    
int main() {
    
    int N, M, a, b; cin >> N >> M;
    depth.assign(N, -1);
    low.assign(N, 0);
    AL.assign(N, vector<int>());
    for (int i = 0; i < M; i++) {
        cin >> a >> b; a--;b--;
        AL[a].push_back(b); AL[b].push_back(a);
    }
    
    for (int i = 0; i < N; i++) {
        if (depth[i] == -1)  AP(i,0,-1);
    }
    
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 10 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10