oj.uz

Submission #397308

# Submission time Handle Problem Language Result Execution time Memory
397308 2021-05-01T21:08:55 Z Bitmasking Pipes (CEOI15_pipes) C++14
60 / 100
 1347 ms 24580 KB 
#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];
ll dspar[2][MAX];
bool vis[MAX];
ll tin[MAX],low[MAX];
vii ans;
ll timer = 0;

ll finds(ll aux,ll v){
    if(v == dspar[aux][v]) return v;
    return dspar[aux][v] = finds(aux,dspar[aux][v]);
}

bool uni(ll aux,ll a,ll b){
    ll u = a,v = b;
    a = finds(aux,a),b = finds(aux,b);
    if(a==b) return 0;
    dspar[aux][b] = a;
    adj[u].pb(v);
    adj[v].pb(u);
    return 1;
}
void is_bridge(ll u,ll v){
    ans.pb({u,v});
}
bool check(ll u,ll v){
    return finds(1,u)==finds(1,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] && !(check(u,v))) 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;
        dspar[0][i] = dspar[1][i] = i;
    }
    f(i,0,m){
        ll u,v;cin>>u>>v;
        if(!uni(0,u,v)){
            uni(1,u,v);
        }
    }
    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
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 5708 KB Output is correct
2 Correct 7 ms 5452 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 111 ms 5508 KB Output is correct
2 Correct 114 ms 9028 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 190 ms 6644 KB Output is correct
2 Correct 228 ms 9620 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 329 ms 8732 KB Output is correct
2 Correct 335 ms 12504 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 456 ms 16156 KB Output is correct
2 Correct 405 ms 13548 KB Output is correct

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 711 ms 21456 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 934 ms 24580 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1138 ms 24548 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1347 ms 20420 KB Memory limit exceeded
2 Halted 0 ms 0 KB -