Submission #374049

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
374049	2021-03-06 13:49:15	duchung	Making Friends on Joitter is Fun (JOI20_joitter2)	C++17	100 / 100	717 ms	41184 KiB

joitter2

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#define ii pair<int , int>
#define ll long long
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 5;
int n , m;
ll ans = 0;
int parent[N];
ll sz[N];
set<ii> edge[N];
set<int> group[N];
int find_set(int u)
{
    return parent[u] == u ? u : find_set(parent[u]);
}
void join(int U , int V)
{
    int u = find_set(U) , v = find_set(V);
    if (u == v) return;
    auto it = edge[v].lower_bound(make_pair(u , 0));
    if (it != edge[v].end() && it->first == u)
    {
        ans += sz[u] * sz[v] * 2;
 
 
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• Subtask 1: 1 / 1
• Subtask 2: 16 / 16
• Subtask 3: 83 / 83