Submission #379769

#	Time	Username	Problem	Language	Result	Execution time	Memory
379769		alirezasamimi100	Pipes (CEOI15_pipes)	C++17	20 / 100	1398 ms	42132 KiB

pipes

#include <bits/stdc++.h>
/*#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")*/
/*#pragma GCC optimize("O2")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2,fma")*/
using namespace std;
using ll = long long int;
#define F first
#define S second
#define pb push_back
#define lc v<<1
#define rc v<<1|1
#define fast_io ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
const int N=5e5+10,LN=20,M=1e5+10,SQ=450,inf=1e9;
const ll INF=1e18;
const int MH=1000696969,MOD=1000000007 /*998244353*/;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using pll=pair<ll,ll>;
using pii=pair<int,int>;
#define ordered_set tree<ll, null_type,less<ll>, rb_tree_tag,tree_order_statistics_node_update>
ll pow(ll x, ll y, ll mod){
    ll ans=1;
    while (y != 0) {
        if (y & 1) ans = ans * x % mod;
        y >>= 1;
        x = x * x % mod;
    }
    return ans;
}
ll n,q,p[2][N],m,dp[N],h[N];
bool f[N];
vector<pll> adj[N];
ll gp(ll c, ll x){
    return p[c][x]?p[c][x]=gp(c,p[c][x]):x;
}
bool uni(ll c, ll v, ll u){
    v=gp(c,v);
    u=gp(c,u);
    if(v==u) return false;
    p[c][u]=v;
    return true;
}
void dfs(ll v, ll i, ll pr){
    f[v]=1;
    dp[v]=h[v];
    for(auto [u,j] : adj[v]){
        if(!f[u]) h[u]=h[v]+1,dfs(u,j,v),dp[v]=min(dp[u],dp[v]);
    }
    for(auto [u,j] : adj[v]){
        if(j!=i) dp[v]=min(dp[v],h[u]);
    }
    if(dp[v]==h[v] && pr) cout << v << ' ' << pr << '\n';
}
int main(){
    fast_io;
    cin >> n >> q;
    while(q--){
        ll v,u;
        cin >> v >> u;
        if(uni(0,v,u) || uni(1,v,u)) adj[v].pb({u,m}),adj[u].pb({v,m++});
    }
    for(ll i=1; i<=n; i++) if(!f[i]) dfs(i,-1,0);
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 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