Submission #1043409

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043409		Pekiban	Pipes (CEOI15_pipes)	C++17	100 / 100	653 ms	6888 KiB

pipes

#include <bits/stdc++.h>
    
using namespace std;
#define pb push_back
    
const int N = 1e5+5;
mt19937 rng(time(0));
// upravo sam imao najgenijalniju ideju svih vremena
vector<int> g[N];
int p[N], dp[N], vis[N];
int get(int &x) {
    if (x == p[x])  return x;
    return p[x] = get(p[x]);
}
bool unite(int u, int v) {
    u = get(u), v = get(v);
    if (u == v) return 0;
    p[v] = u;
    return 1;
}
void upd(int &u, int &v) {
    int x = rng() % (1LL << 30);
    dp[u] ^= x;
    dp[v] ^= x;
}
void dfs(int &s, int &e) {
    for (auto &u : g[s]) {
        if (u == e) continue;
        dfs(u, s);
        dp[s] ^= dp[u];
    }
    if (e && !dp[s])    cout << e << ' ' << s << '\n';
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    iota(p, p+N, 0);
    int n, m;
    cin >> n >> m;
    int u, v;
    for (int i = 0; i < m; ++i) {
        cin >> u >> v;
        if (unite(u, v)) {
            g[u].pb(v), g[v].pb(u);
        }
        else {
            upd(u, v);
        } 
    }
    // for (int i = 1; i <= n; ++i) {
    //     cout << i << ':';
    //     for (auto x : g[i]) {
    //         cout << x << ' ';
    //     }
    //     cout << '\n';
    // }
    // for (int i = 1; i <= n; ++i)    cout << dp[i] << ' ';
    for (int i = 1; i <= n; ++i) {
        if (!vis[get(i)]) {
            // cout << get(i) << ' ';
            // cout << '\n';
            int p = get(i), z = 0;
            dfs(p, z);
            vis[get(i)] = 1;
        }
    }

}

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