Submission #765269

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
765269	2023-06-24 10:05:05	canadavid1	Joker (BOI20_joker)	C++14	25 / 100	205 ms	10132 KiB

Joker

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#include <bits/stdc++.h>
using namespace std;
vector<bool> diff;
vector<int> p;
vector<int> siz;
pair<int,bool> find(int a,bool len=0)
{
    if (p[a] == -1) return {a,len};
    return find(p[a],len^diff[a]); // no path compression
}
bool unite(int a,int b) // true if works, false elsewise
{
    auto av = find(a);
    auto bv = find(b);
    if (av.first == bv.first) return av.second!=bv.second;
    
    if (siz[av.first] > siz[bv.first]) swap(av,bv);
    // b > a
    p[av.first] = bv.first;
    siz[bv.first] += siz[av.first];
    if (av.second == bv.second) diff[av.first] = true;
    return true;
}
 
 
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