Submission #965038

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
965038	2024-04-18 04:01:33	Pannda	Swapping Cities (APIO20_swap)	C++17	17 / 100	2064 ms	524288 KiB

swap

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#include "swap.h"
#include <bits/stdc++.h>
using namespace std;
struct DSU {
    vector<int> f;
    vector<int> siz;
    vector<int> deg;
    vector<bool> ok;
    DSU(int n) : f(n), siz(n, 1), deg(n, 0), ok(n, false) { iota(f.begin(), f.end(), 0); }
    int leader(int u) {
        while (u != f[u]) u = f[u] = f[f[u]];
        return u;
    }
    bool unionize(int u0, int v0) {
        int u = leader(u0);
        int v = leader(v0);
        if (u == v) {
            ok[u] = true;
            return false;
        }
        if (siz[u] > siz[v]) swap(u, v);
        siz[v] += siz[u];
        if (++deg[u0] >= 3 || ++deg[v0] >= 3) ok[v] = true;
        ok[v] = ok[v] | ok[u];
        f[u] = v;
 
 
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