oj.uz

답안 #230147

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
230147 2020-05-08T17:33:20 Z ruler Pipes (CEOI15_pipes) C++17
80 / 100
 1404 ms 62344 KB 
// IOI 2021
#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define ends ' '
#define die(x) return cout << x << endl, 0
#define all(v) v.begin(), v.end()
#define sz(x) (int)(x.size())
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) { cerr << ends << H; debug_out(T...); }
#define debug(...) cerr << "{" << #__VA_ARGS__ << "}:", debug_out(__VA_ARGS__)
typedef long long ll;
typedef pair<int, int> pii;
const int INF = 1e9;
const ll MOD = 1e6 + 7;
 
////////////////////////////////////////////////////////////////////

const int N = 1e5 + 5;

int H[N];
vector<int> G[N];
bool M[N];

struct DSU {
	int P[N];
	int GetPar(int v) { return P[v] ? P[v] = GetPar(P[v]) : v; }
	bool Merge(int v, int u) {
		v = GetPar(v), u = GetPar(u);
		if (v == u) return false;
		P[u] = v;
		return true;
	}
} T, B;

int DFS(int v, int p = 0) {
	M[v] = true;
	int dp = H[v];
	bool f = false;
	for (int u : G[v]) {
		if (u == p && !f) { f = true; continue; }
		if (!M[u]) H[u] = H[v] + 1, dp = min(dp, DFS(u, v));
		else dp = min(dp, H[u]);
	}
	if (p && dp == H[v]) cout << p << ends << v << endl;
	return dp;
}

int main() {

	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	mt19937 Rnd(time(0));

	int n, m; cin >> n >> m;
	for (int i = 0; i < m; i++) {
		int v, u; cin >> v >> u;
		if (T.Merge(v, u) || B.Merge(v, u)) G[v].push_back(u), G[u].push_back(v);
	}	
	for (int i = 1; i <= n; i++) if (!T.P[i]) DFS(i);

	return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 2688 KB Output is correct
2 Correct 6 ms 2688 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 3328 KB Output is correct
2 Correct 10 ms 3072 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 100 ms 3576 KB Output is correct
2 Correct 100 ms 3576 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 191 ms 4344 KB Output is correct
2 Correct 193 ms 3704 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 314 ms 5824 KB Output is correct
2 Correct 277 ms 5496 KB Output is correct

Subtask #6
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 458 ms 10488 KB Output is correct
2 Correct 399 ms 7548 KB Output is correct

Subtask #7
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 699 ms 11768 KB Output is correct
2 Correct 721 ms 8844 KB Output is correct

Subtask #8
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 966 ms 13792 KB Output is correct
2 Correct 875 ms 8948 KB Output is correct

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1131 ms 14072 KB Output is correct
2 Runtime error 1129 ms 62344 KB Memory limit exceeded (if you are sure your verdict is not MLE, please contact us)

Subtask #10
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1378 ms 13324 KB Output is correct
2 Runtime error 1404 ms 25080 KB Memory limit exceeded (if you are sure your verdict is not MLE, please contact us)