Submission #406433

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
406433	2021-05-17 15:15:40	tengiz05	Swapping Cities (APIO20_swap)	C++17	0 / 100	2008 ms	53668 KiB

swap

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#include "swap.h"
#include <bits/stdc++.h>
constexpr int N = 3e5 + 5;
int n, m;
int up[N][20], f[N], ans[N], tin[N], tout[N];
std::vector<int> e[N], to[N];
struct desu{
    std::vector<int> p;
    desu(int n){
        p.assign(n, 0);
        iota(p.begin(), p.end(), 0);
    }
    int leader(int u){
        while (p[u] != u) u = p[u] = p[p[u]];
        return u;
    }
    void merge(int u, int v){
        u = leader(u);
        v = leader(v);
        if (u == v) return;
        p[v] = u;
    }
    bool same(int u, int v){
        return leader(u) == leader(v);
    }
}d(N);
int timer = 0;
void dfs(int u, int p){
    tin[u] = timer++;
    up[u][0] = p;
 
 
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