oj.uz

Submission #669591

# Submission time Handle Problem Language Result Execution time Memory
669591 2022-12-06T19:47:48 Z Iliya_ Pipes (CEOI15_pipes) C++17
0 / 100
 1000 ms 61632 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 = 1e5+7;
const int BB = 6e6+7;;
pair<int,int> v[BB];
int par1[B];
int siz1[B];
int par2[B];
int siz2[B];
int n,m,a,b,one,two;
vector<pair<int,int>> g[B];
bitset<B> seen;
int father[B];
int dist[B];
int val[B];
bool ans[BB];
// 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;}
     if (siz1[one] > siz1[two]){swap(one,two);}
     siz1[two] += siz1[one];
     par1[one] = two;
     return 1;
}
bool merge2(int v, int u){
     one = get_root2(v);
     two = get_root2(u);
     if (one == two){return 0;}
     if (siz2[one] > siz2[two]){swap(one,two);}
     siz2[two] += siz2[one];
     par2[one] = two;
     return 1;
}
void dfs(int v){
     seen[v] = 1;
     for(auto cur : g[v]){
          int u = cur.first;
          if (seen[u] == 0){
               father[u] = v;
               dist[u] = dist[v] + 1;
               dfs(u);
               val[v] += val[u];
               if (val[u] == 0){ans[cur.second] = 1;}
          }
          else if (father[u] != v && father[v] != u && dist[u] < dist[v]){
               val[u]--;
               val[v]++;
          }
     }
}
int32_t main(){
	ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	cin >> n >> m;
	for(int i=1; i<=n; i++){siz1[i] = siz2[i] = 1; par1[i] = par2[i] = i;}
	for(int i=1; i<=m; i++){
          cin >> v[i].first >> v[i].second;
          if (merge1(v[i].first,v[i].second)){
               g[v[i].first].push_back({v[i].second,i});
               g[v[i].second].push_back({v[i].first,i});
          }
          else if (merge2(v[i].first,v[i].second)){
               g[v[i].first].push_back({v[i].second,i});
               g[v[i].second].push_back({v[i].first,i});
          }
	}
     for(int i=1; i<=n; i++){
          if (seen[i] == 0){
               father[i] = 0;
               dist[i] = 0;
               dfs(i);
          }
     }
     for(int i=1; i<=m; i++){
          if (ans[i]){
               cout << v[i].first << " " << v[i].second << endl;
          }
     }

	return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Incorrect 2 ms 2644 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3284 KB Output is correct
2 Incorrect 5 ms 3156 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 7756 KB Output is correct
2 Incorrect 85 ms 7628 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 147 ms 11728 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 257 ms 17312 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 337 ms 25736 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 530 ms 35460 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 658 ms 45116 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 819 ms 52876 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1000 ms 61632 KB Memory limit exceeded
2 Halted 0 ms 0 KB -