Submission #118488

#	Time	Username	Problem	Language	Result	Execution time	Memory
118488		SamAnd	Pipes (CEOI15_pipes)	C++17	10 / 100	3313 ms	65536 KiB

pipes

#include <bits/stdc++.h>
using namespace std;
const int N = 100005;

int n, m;
vector<int> a[N];

bool c[N];
int tin[N], fup[N], ti;
void dfs(int x, int p)
{
    c[x] = true;
    fup[x] = tin[x] = ti++;
    for (int i = 0; i < a[x].size(); ++i)
    {
        int h = a[x][i];
        if (h == p)
            continue;
        if (c[h])
            fup[x] = min(fup[x], tin[h]);
        else
        {
            dfs(h, x);
            if (fup[h] > tin[x])
                cout << x << ' ' << h << endl;
            fup[x] = min(fup[x], fup[h]);
        }
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin >> n >> m;
    for (int i = 0; i < m; ++i)
    {
        int x, y;
        cin >> x >> y;
        a[x].push_back(y);
        a[y].push_back(x);
    }
    for (int i = 1; i <= n; ++i)
        if (!c[i])
            dfs(i, -1);
    return 0;
}

Compilation message (stderr)

pipes.cpp: In function 'void dfs(int, int)':
pipes.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a[x].size(); ++i)
                     ~~^~~~~~~~~~~~~

• 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