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import numpy as np
import matplotlib.pyplot as plt
from matplotlib.colors import ListedColormap


def plot_decision_regions(X, y, classifier, title=None, test_idx=None, resolution=0.02):
    markers = ('s', 'x', 'o', '^', 'v')
    colors = ('red', 'blue', 'lightgreen', 'gray', 'cyan')
    cmap = ListedColormap(colors[:len(np.unique(y))])
    x1_min, x1_max = X[:, 0].min() - 1, X[:, 0].max()+1

Shirataki2

#include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < n; i++)

#define DESC(class, type) class<type> *, vector<class<type> *>, greater<class<type> *> 

using namespace std;
static const int nil = (1 << 31);
static const int inf = (1 << 30);

class UnionFind {

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