oj.uz

답안 #669612

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
669612 2022-12-06T20:36:59 Z Iliya_ Pipes (CEOI15_pipes) C++17
100 / 100
 955 ms 15436 KB 
// IN THE NAME OF GOD
#include<bits/stdc++.h>
#pragma GCC optimize ("O2,unroll-loops")
#define endl '\n';
#define file_reading freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);
using namespace std;
typedef long long ll;
typedef long double dll;
typedef unsigned long long ull;
// Variables
const int B = 100000 + 7;
int par1[B];
int par2[B];
int n,m,a,b,one,two;
vector<int> g[B];
bool seen[B];
int father[B];
int dist[B];
int val[B];
// main functions
int get_root1(int v){
     return (par1[v] == v ? v : par1[v] = get_root1(par1[v]));
}
int get_root2(int v){
     return (par2[v] == v ? v : par2[v] = get_root2(par2[v]));
}
bool merge1(int v, int u){
     one = get_root1(v);
     two = get_root1(u);
     if (one == two){return 0;}
     par1[one] = two;
     return 1;
}
bool merge2(int v, int u){
     one = get_root2(v);
     two = get_root2(u);
     if (one == two){return 0;}
     par2[one] = two;
     return 1;
}
void dfs(int vv){
     seen[vv] = 1;
     for(auto u : g[vv]){
          if (seen[u] == 0){
               father[u] = vv;
               dist[u] = dist[vv] + 1;
               dfs(u);
               val[vv] += val[u];
               int cnt = 0;
               for(auto ind : g[vv]){if (ind == u){cnt++;}}
               if (val[u] == 0 && cnt == 1){cout << vv << " " << u << endl;}
          }
          else if (father[u] != vv && father[vv] != u && dist[u] < dist[vv]){
               val[u]--;
               val[vv]++;
          }
     }
}
int32_t main(){
	ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	cin >> n >> m;
	for(int i=1; i<=n; i++){par1[i] = par2[i] = i;}
	for(int i=1; i<=m; i++){
          cin >> a >> b;
          if (merge1(a,b)){
               g[a].push_back(b);
               g[b].push_back(a);
          }
          else if (merge2(a,b)){
               g[a].push_back(b);
               g[b].push_back(a);
          }
	}
     for(int i=1; i<=n; i++){
          if (seen[i] == 0){
               father[i] = 0;
               dist[i] = 0;
               dfs(i);
          }
     }

	return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 3156 KB Output is correct
2 Correct 4 ms 2900 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 87 ms 3108 KB Output is correct
2 Correct 82 ms 2836 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 148 ms 3908 KB Output is correct
2 Correct 158 ms 3264 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 234 ms 5712 KB Output is correct
2 Correct 206 ms 5432 KB Output is correct

Subtask #6
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 316 ms 11548 KB Output is correct
2 Correct 286 ms 7496 KB Output is correct

Subtask #7
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 484 ms 12948 KB Output is correct
2 Correct 457 ms 9800 KB Output is correct

Subtask #8
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 639 ms 15436 KB Output is correct
2 Correct 599 ms 9720 KB Output is correct

Subtask #9
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 818 ms 15376 KB Output is correct
2 Correct 759 ms 9620 KB Output is correct

Subtask #10
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 955 ms 14752 KB Output is correct
2 Correct 880 ms 11564 KB Output is correct