Submission #810324

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
810324	2023-08-06 08:27:56	vuavisao	Feast (NOI19_feast)	C++17	100 / 100	81 ms	12152 KiB

feast

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#include<bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define ll long long
using namespace std;
const ll N = 3e5 + 10;
const ll INF = 1e18;
struct dsu {
    ll n = 0;
    vector<ll> parent = {};
    
    void resize(ll _n) {
        n = _n; 
        parent.resize(n + 10); for(ll i = 1; i <= n; ++ i) parent[i] = i;
    }
    dsu() {};
    dsu(ll _n) { this -> resize(_n); };
    ll ancestor(ll u) {
        if(parent[u] == u) return u;
        return parent[u] = ancestor(parent[u]);
    }
    bool join(ll u, ll v) {
        u = ancestor(u); v = ancestor(v);
        if(u == v) return false;
        parent[v] = u;
        return true;
 
 
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