oj.uz

Submission #669296

# Submission time Handle Problem Language Result Execution time Memory
669296 2022-12-06T08:14:37 Z manizare Pipes (CEOI15_pipes) C++17
100 / 100
 1212 ms 15588 KB 
#include <bits/stdc++.h>
#define all(a) a.begin(),a.end() 
#define pb push_back
using namespace std ;
const int maxn = 1e5+100 , maxq =2e5+10 , inf = 2e17 + 100 , mod = 1e9 + 7 ;
vector <pair <int , int > >G[maxn] ;
int par[maxn] , par2[maxn] , p[maxn] , dp[maxn] , dis[maxn] ;bool mark[maxn] , j[maxq];
int find(int v){
	if(par[v] == v)return v; 
	return par[v] = find(par[v]);
}
int find2(int v){
	if(par2[v] == v)return v; 
	return par2[v] = find2(par2[v]) ;
}

void dfs(int v){
	mark[v] = 1; 
	for(int i = 0 ; i < G[v].size() ; i++){
		int u = G[v][i].first , o = G[v][i].second; ;
		if(mark[u] == 1){
			if(j[o] == 0 && dis[u] < (dis[v])){
				dp[v] ++ ;
				dp[u]--;
			}
			continue ;
		}
		dis[u] = dis[v] + 1; 
		p[u] = v; 
		j[o] = 1; 
		dfs(u);
		dp[v] += dp[u] ;
	}
}

signed main(){	
	ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
	int n , m ;
	cin >> n >> m ;
	for(int i= 1 ; i <= n ; i++){
		par[i] = i ;
		par2[i] = i ; 
	}
	int c = 1; 
	for(int i =1 ; i <= m ; i++){
		int v  , u ;
		cin >> v >> u ;
		int v1 = find(v) , u1 = find(u);
		if(v1 != u1){
			G[v].pb({u , c}) ;
			G[u].pb({v , c});c++;
			par[v1] = u1 ;
		}else if(find2(v) != find2(u)){
			par2[find2(v)] = find2(u);
			G[v].pb({u,c}) ;
			G[u].pb({v,c});c++;
		}
	}
	for(int i = 1; i <= n ; i++){
		if(mark[i] == 0)dfs(i); 
	}
	for(int i = 1; i <= n ; i++){
		if(dp[i] == 0 && p[i] != 0){
			cout << i << " " << p[i] << "\n";
		}
	}
}

Compilation message

pipes.cpp:5:54: warning: overflow in conversion from 'double' to 'int' changes value from '2.000000000000001e+17' to '2147483647' [-Woverflow]
    5 | const int maxn = 1e5+100 , maxq =2e5+10 , inf = 2e17 + 100 , mod = 1e9 + 7 ;
      |                                                 ~~~~~^~~~~
pipes.cpp: In function 'void dfs(int)':
pipes.cpp:19:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |  for(int i = 0 ; i < G[v].size() ; i++){
      |                  ~~^~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory 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

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3284 KB Output is correct
2 Correct 5 ms 3028 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 90 ms 3108 KB Output is correct
2 Correct 86 ms 2940 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 145 ms 3872 KB Output is correct
2 Correct 203 ms 3464 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 262 ms 5700 KB Output is correct
2 Correct 213 ms 5340 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 369 ms 11784 KB Output is correct
2 Correct 316 ms 8840 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 689 ms 13220 KB Output is correct
2 Correct 545 ms 9768 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 915 ms 15584 KB Output is correct
2 Correct 729 ms 11624 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1026 ms 15588 KB Output is correct
2 Correct 1047 ms 11608 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1212 ms 14980 KB Output is correct
2 Correct 1014 ms 11580 KB Output is correct