Submission #1193892

#	Time	Username	Problem	Language	Result	Execution time	Memory
1193892		nuutsnoynton	Pipes (CEOI15_pipes)	C++20	30 / 100	387 ms	16544 KiB

pipes

#include<bits/stdc++.h>

using namespace std;
using ll = int;
using pll = pair < ll, ll >;
const ll N = 1e4 + 2;

ll tin[N], timer = 1, low[N];
vector < ll > adj[N];


void euler_tour(ll node, ll par) {
	tin[node] = timer;
	low[node] = timer;
	timer ++;
	bool parent_found = false;
	for ( ll nxt : adj[node]) {
		if ( nxt == par && parent_found == false) {
			parent_found = true;
			continue;
		}
		if ( tin[nxt] > 0) {
			low[node] = min(low[node], tin[nxt]);
			continue;
		}
		euler_tour(nxt, node);
		low[node] = min(low[node], low[nxt]);
		if ( low[nxt] > tin[node]) {
			cout << node << " " << nxt << endl;
		}
	}
}

ll ataman[N];
ll Get(ll x) {
	if ( x == ataman[x]) return x;
	return ataman[x] = Get(ataman[x]);
}

void Unite(ll x, ll y) {
	x = Get(x);
	y = Get(y);
	if (x  == y) return ;
	if ( x > y) swap(x,y);
	ataman[x] = y;
}

int main() {
	ll n, m, r, x, y, i, j, ans, t;
	
	cin >> n >> m;
	for (i = 1; i <= n; i ++) ataman[i] = i;
	for (i = 1; i <= m; i ++) {
		cin >> x >> y;
		if ( Get(x) == Get(y)) continue;
		adj[x].push_back(y);
		adj[y].push_back(x);
	}
	
	for (i = 1; i <= n; i ++) {
		if ( tin[i] == 0) euler_tour(i, -1);
	}
	
	
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 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