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Submission #1098960

# Submission time Handle Problem Language Result Execution time Memory
1098960 2024-10-10T11:36:05 Z nikolashami Pipes (CEOI15_pipes) C++14
40 / 100
 717 ms 65536 KB 
#include <bits/stdc++.h>
using namespace std;
mt19937 rng(time(0));

const int mxN=1e5+2;
vector<int>adj[mxN];
int ln[mxN],dp[mxN];
bitset<mxN>vv;

int finde(int&x){
	return x==ln[x]?x:ln[x]=finde(ln[x]);
}

void merge(int u,int v){
	ln[finde(u)]=finde(v);
}

void dfs(int&u,int&p){
	vv[u]=1;
	for(int&v:adj[u]){
		if(!(v^p))
			continue;
		dfs(v,u);
		dp[u]^=dp[v];
	}
}

void res(int&u,int&p){
	vv[u]=1;
	for(int&v:adj[u]){
		if(!(v^p))
			continue;
		res(v,u);
		if(!dp[v])
			cout<<u<<' '<<v<<'\n';
	}
}

int32_t main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    int n,m;
    cin>>n>>m;

    iota(ln,ln+n+1,0);

    for(int i=0,u,v;i<m;++i){
    	cin>>u>>v;
    	if(finde(u)==finde(v)){
    		int xx=rng();
    		dp[u]^=xx;
    		dp[v]^=xx;
    	}else{
    		merge(u,v);
    		adj[u].push_back(v);
    		adj[v].push_back(u);
    	}
    }

    vv.reset();
    for(int fi=1,u,p;fi<=n;++fi){
    	if(vv[fi])
    		continue;
    	u=fi,p=0;
    	dfs(u,p);
    }

    vv.reset();
    for(int fi=1,u,p;fi<=n;++fi){
    	if(vv[fi])
    		continue;
    	u=fi,p=0;
    	res(u,p);
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 2 ms 2652 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2904 KB Output is correct
2 Correct 4 ms 2908 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 8184 KB Output is correct
2 Correct 64 ms 8048 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 136 ms 12780 KB Output is correct
2 Correct 124 ms 14420 KB Output is correct

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 177 ms 19840 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 268 ms 26112 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 368 ms 39168 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 494 ms 50516 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 615 ms 62176 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 717 ms 65536 KB Memory limit exceeded
2 Halted 0 ms 0 KB -