Method find

kotlin/Graphs/MergingCommunities.kt:24–31

    }

    fun find(x: Int): Int {
        if (x == parent[x]) {
            return x
        }
        // Path compression.
        parent[x] = find(parent[x])
        return parent[x]
    }

    fun getSize(x: Int): Int {
        return size[find(x)]