Submission #397307

#	Time	Username	Problem	Language	Result	Execution time	Memory
397307		Bitmasking	Pipes (CEOI15_pipes)	C++14	0 / 100	1002 ms	65540 KiB

pipes

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
#define f(i,a,b) for( ll i = a; i < b ; i++ )
#define af(i,a,b) for( ll i = a; i >= b ; i--)
#define rep(i,a,b,k) for(ll i = a; i < b ; i+= k )
#define arep(i,a,b,k) for( ll i = a; i >= b ; i-= k)
#define ones(ini) (ll) __builtin_popcountll(x)
#define todo(y,val) all_of(all(y),[&val](ll x) {return (x == ((ll)val));})
#define nada(y,val) none_of(all(y),[&val](ll x) {return (x == ((ll)val));})
#define algu(y,val) any_of(all(y),[&val](ll x) {return (x == ((ll)val));})
#define cuantos(a,x) count(all(a),x)
#define fs first
#define sc second
#define pb push_back
#define po pop_back
#define sz(a) (ll) a.size()
#define all(a) a.begin(), a.end()
#define sor(a) sort( a.begin(), a.end() )
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ller ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr)
#define watch(x) cout << (#x) << " is " << (x) <<"\n"
#define test ll deftestcases;cin>>deftestcases;while(deftestcases--)
#define PI acos(-1)
using namespace std;
typedef long long ll;
typedef long double ld; 
typedef pair<ll,ll> ii;
typedef vector<ll>  vi;
typedef vector<ii> vii;
template<class T> using ordered_set =tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update> ;
const ll inf = 2e18;
const ll mod = 1e9+7;   
const ll MAX = 2e5+10;
 
vi adj[MAX];
 
bool vis[MAX];
ll tin[MAX],low[MAX];
vii ans;
ll timer = 0;
void is_bridge(ll u,ll v){
    ans.pb({u,v});
}
void dfs(ll u,ll par = -1){
    vis[u] = 1;
    tin[u] = low[u] = timer++;
    for(auto v : adj[u]){
        if(v == par) continue;
        if(vis[v]) low[u] = min(low[u],tin[v]);
        else{
            dfs(v,u);
            if(low[v] >tin[u]) is_bridge(u,v);
            low[u] = min(low[u],low[v]);
        }
    }
}
 
void init_bridges(ll n,ll m){
    timer = 0;
    f(i,0,n+1){
        tin[i]=low[i]=-1;
    }
    f(i,0,m){
        ll u,v;cin>>u>>v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    f(i,1,n+1){
        if(!vis[i]) dfs(i);
    }
}
void print_bridges(){
    for(auto it : ans){
        cout<<it.fs<<" "<<it.sc<<"\n";
    }
}
 
 
int main(){
    fastio;
    timer = 0;
    ll n,m;cin>>n>>m;
    init_bridges(n,m);
    print_bridges();
    return 0;  
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10