Submission #1041486

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1041486	2024-08-02 04:43:52	hotboy2703	Making Friends on Joitter is Fun (JOI20_joitter2)	C++17	100 / 100	532 ms	102228 KiB

joitter2

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#include<bits/stdc++.h>
using ll = long long;
using namespace std;
#define pll pair <ll,ll>
#define fi first
#define se second
#define MP make_pair
#define sz(a) (ll((a).size()))
#define BIT(mask,i) (((mask) >> (i))&1)
#define MASK(i) (1LL << (i))
const ll INF = 1e9;
const ll MAXN = 1e5+100;
set <ll> s[MAXN];
set <pll> rev[MAXN];
set <ll> edge[MAXN];
ll dsu[MAXN];
ll ans;
vector <pll> all;
void join(ll x,ll y){
    x = dsu[x],y = dsu[y];
    if (x==y)return;
    if (sz(s[x]) < sz(s[y]))swap(x,y);
    for (auto it = rev[x].lower_bound(MP(y,0));it != rev[x].end() && (*it).fi == y;it=rev[x].erase(it)){
        ans -= sz(s[x]);
    }
    for (auto it = rev[y].lower_bound(MP(x,0));it != rev[y].end() && (*it).fi == x;it=rev[y].erase(it)){
        ans -= sz(s[y]);
    }
    ans += sz(s[x]) * sz(s[y]) * 2;
    ans += sz(rev[x]) * sz(s[y]) + sz(rev[y]) * sz(s[x]);
 
 
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• Subtask 1: 1 / 1
• Subtask 2: 16 / 16
• Subtask 3: 83 / 83