oj.uz

Submission #667506

# Submission time Handle Problem Language Result Execution time Memory
667506 2022-12-01T15:37:41 Z Alish Pipes (CEOI15_pipes) C++14
40 / 100
 160 ms 1612 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long int	ll;
typedef long double	ld;

#define F		first
#define S		second
#define pb		push_back
#define endl            '\n'
#define Mp		make_pair
#define all(x) x.begin(), x.end()
#define debug(x)  cerr << #x << " = " << x << endl
#define set_dec(x)	cout << fixed << setprecision(x);
#define fast_io                     ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io                     freopen("in.txt" , "r+" , stdin) ; freopen("out.txt" , "w+" , stdout);


ll mod = 1e9+7;

ll power(ll a, ll b)
{
    return (!b ? 1 : (b & 1 ? a * power(a * a % mod, b / 2) % mod : power(a * a % mod, b / 2) % mod));
}
const int N= 10001;
vector<int> g[N] ;
int mn[N] , h[N] , par1[N] , par2[N] , vis[N];
int getPar1(int v){
    return (par1[v]==-1)?v: par1[v]= getPar1(par1[v]);
}
int getPar2(int v){
    return (par2[v]==-1)? v: par2[v]= getPar2(par2[v]);
}
bool Union1(int v, int u){
    v= getPar1(v); u = getPar1(u);
    if(u==v) return 0;
    par1[u]=v;
    return 1;
}
bool Union2(int v, int u){
    v= getPar2(v); u = getPar2(u);
    if(u==v) return 0;

    par2[u]=v;
    return 1;
}

void dfs(int v, int p ){
    vis[v]=1;
    mn[v]=h[v];
    int fuck = 0;
    for(int u: g[v]){
        if(u==p && !fuck ){fuck=1; continue;}
        if(!vis[u]){

            h[u]= h[v]+1;
            dfs(u,v);
            mn[v]= min (mn[v], mn[u]);

        }
        else{
            mn[v]= min(mn[v] , h[u]);
        }
    }
    if(p && mn[v]==h[v]) cout<<p<<" "<<v<<endl;
}
int n , m;
int main(){
    fast_io
    cin>>n>>m;
    for(int i=1; i<=n; i++){
        par1[i]=-1;
        par2[i]=-1;

    }

    for(int i=1 ;i<=m; i++){
        int u ,v; cin>>v>>u;
        if(Union1(v,u)){
            g[v].pb(u); g[u].pb(v);
        }
        else if(Union2(u,v)){
            g[v].pb(u); g[u].pb(v);
        }
    }
    for(int i=1; i<=n; i++) if(!vis[i]) dfs(i,0);

}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 468 KB Output is correct
2 Correct 0 ms 468 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 980 KB Output is correct
2 Correct 3 ms 852 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 868 KB Output is correct
2 Correct 81 ms 732 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 131 ms 1612 KB Output is correct
2 Correct 160 ms 1388 KB Output is correct

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 1108 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 1236 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 1236 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 852 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 852 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 1236 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -