Submission #1021711

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
10217112024-07-13 03:04:26idiotcomputerPipes (CEOI15_pipes)C++11
90 / 100
730 ms23528 KiB
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2")
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz size
const int mxN = 1e5;
int n,m;
vector<int> adj[mxN];
int p[2*mxN];
void dfs(int c, int depth, int par){
p[c] = depth;
p[c+n] = p[c];
int op = par;
for (int i : adj[c]){
if (i == par){par = -1; continue;}
if (p[i] != -1){ p[c+n] = min(p[c+n],p[i]); continue;}
dfs(i,depth+1,c);
p[c+n] = min(p[c+n], p[i+n]);
}
if (p[c+n] >= depth && op != -1) cout << c+1 << " " << op+1 << '\n';
}
int gpar(const int &c){
if (p[c] == c) return c;
p[c] = gpar(p[c]);
 
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