| # | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
|---|---|---|---|---|---|---|---|
| 948383 | 2024-03-18T05:10:20 Z | vjudge1 | Pipes (CEOI15_pipes) | C++17 | 79 ms | 10836 KB |
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define rnd(l, r) uniform_int_distribution<int>(l, r)(rng)
using namespace std;
void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
int pow(int a,int b,int m){int ans=1;while(b){if(b&1){ans=(ans*a)%m;}b>>=1;a=(a*a)%m;}return ans;}
int binpow(int a,int b){int ans=1;while(b){if(b&1){ans=(ans*a);}b>>=1;a=(a*a);}return ans;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int N = 5e3 + 10;
int tin[N], tout[N];
int low[N];
bool used[N];
vector <int> g[N];
int timer;
void dfs_low(int v, int p = -1){
used[v] = true;
tin[v] = low[v] = ++timer;
for (auto u : g[v]){
if (u == p) continue;
if (used[u]){
low[v] = min(low[v], tin[u]);
}else{
dfs_low(u, v);
low[v] = min(low[v], low[u]);
if (low[u] > tin[v]){
cout << min(v, u) <<" "<< max(v, u) << "\n";
}
}
}
}
main(){
iostream::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int n, m;
cin >> n >> m;
for(int i = 0; i < m; i++){
int a, b;
cin >> a >> b;
g[a].pb(b);
g[b].pb(a);
}
for(int i = 1; i <= n; i++){
if(!used[i]){
dfs_low(i);
}
}
}
/*
* Before implementing the problem:
Do I understand the problem correctly?
Which places are tricky? What do I need to remember to implement them correctly?
Which place is the heaviest by implementation? Can I do it simpler?
Which place is the slowest? Where do I need to be careful about constant factors and where I can choose slower but simpler implementation?
----------------------------------
If not AC:
Did you remember to do everything to handle the tricky places you thought about before?
Is the solution correct?
Do I understand the problem correctly?
----------------------------------
If you have a test on which the solution gives wrong answer:
Is the solution doing what it was supposed to do?
Is the problem in the code or in the idea?
*/
Compilation message
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Correct | 0 ms | 348 KB | Output is correct |
| 2 | Incorrect | 0 ms | 600 KB | Wrong number of edges |
| 3 | Halted | 0 ms | 0 KB | - |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Correct | 3 ms | 1112 KB | Output is correct |
| 2 | Incorrect | 2 ms | 812 KB | Wrong number of edges |
| 3 | Halted | 0 ms | 0 KB | - |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Correct | 79 ms | 8620 KB | Output is correct |
| 2 | Correct | 77 ms | 10836 KB | Output is correct |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Runtime error | 1 ms | 860 KB | Execution killed with signal 11 |
| 2 | Halted | 0 ms | 0 KB | - |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Runtime error | 1 ms | 1108 KB | Execution killed with signal 11 |
| 2 | Halted | 0 ms | 0 KB | - |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Runtime error | 1 ms | 856 KB | Execution killed with signal 11 |
| 2 | Halted | 0 ms | 0 KB | - |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Runtime error | 1 ms | 856 KB | Execution killed with signal 11 |
| 2 | Halted | 0 ms | 0 KB | - |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Runtime error | 1 ms | 860 KB | Execution killed with signal 11 |
| 2 | Halted | 0 ms | 0 KB | - |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Runtime error | 1 ms | 860 KB | Execution killed with signal 11 |
| 2 | Halted | 0 ms | 0 KB | - |
| # | 결과 | 실행 시간 | 메모리 | Grader output |
|---|---|---|---|---|
| 1 | Runtime error | 1 ms | 856 KB | Execution killed with signal 11 |
| 2 | Halted | 0 ms | 0 KB | - |