Submission #311859

---

Source Code Expand

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.IO;

class Myon
{
    public Myon() { }
    public static int Main()
    {

        rnd = new XRand();
        new Myon().calc();
        return 0;
    }
    static XRand rnd;


    void calc()
    {
        Scanner cin = new Scanner();
        int N = cin.nextInt();
        int M = cin.nextInt();
        int[] a = new int[M];
        int[] b = new int[M];

        for (int i = 0; i < M; i++)
        {
            a[i] = cin.nextInt() - 1;
            b[i] = cin.nextInt() - 1;
        }

        init(N);
        for (int i = 0; i < M; i++)
        {
            connect(a[i], b[i]);
        }

        int ret = 0;
        for (int i = 0; i < N; i++)
        {
            if (getuni(i) == i) ret++;
        }
        Console.WriteLine(ret - 1);
    }

    int[] uni;

    void init(int N)
    {
        uni = new int[N];
        for (int i = 0; i < N; i++)
        {
            uni[i] = -1;
        }
    }

    int getuni(int a)
    {
        if (uni[a] < 0) return a;
        else return uni[a] = getuni(uni[a]);
    }

    bool connect(int a, int b)
    {
        a = getuni(a);
        b = getuni(b);
        if (a == b) return false;
        uni[a] = b;
        return true;
    }

}




class Scanner
{
    string[] s;
    int i;

    char[] cs = new char[] { ' ' };

    public Scanner()
    {
        s = new string[0];
        i = 0;
    }

    public string next()
    {
        if (i < s.Length) return s[i++];
        do
        {
            s = Console.ReadLine().Split(cs, StringSplitOptions.RemoveEmptyEntries);
        } while ((s.Length == 1 && s[0] == "") || s.Length == 0);
        i = 0;
        return s[i++];
    }

    public int nextInt()
    {
        return int.Parse(next());
    }

    public long nextLong()
    {
        return long.Parse(next());
    }

    public double nextDouble()
    {
        return double.Parse(next());
    }

}

class XRand
{
    uint x, y, z, w;


    public XRand()
    {
        init();
    }

    public XRand(uint s)
    {
        init();
        init_xor128(s);
    }

    void init()
    {
        x = 314159265; y = 358979323; z = 846264338; w = 327950288;

    }

    public void init_xor128(uint s)
    {
        z ^= s;
        z ^= z >> 21; z ^= z << 35; z ^= z >> 4;
        z *= 736338717;
    }

    uint next()
    {
        uint t = x ^ x << 11; x = y; y = z; z = w; return w = w ^ w >> 19 ^ t ^ t >> 8;
    }

    public long nextLong(long m)
    {
        return (long)((((ulong)next() << 32) + next()) % (ulong)m);
    }

    public int nextInt(int m)
    {
        return (int)(next() % m);
    }

    public long nextLong(long min, long max)
    {
        return min + nextLong(max - min + 1);
    }

    public int nextInt(int min, int max)
    {
        return min + nextInt(max - min + 1);
    }

    public int nextIntP(int a)
    {
        return (int)Math.Pow(a, nextDouble());
    }

    public int nextIntP(int min, int max)
    {
        int diff = max - min;
        return min + nextIntP(diff + 2) - 1;
    }

    public long nextLongP(long a)
    {
        return (long)Math.Pow(a, nextDouble());
    }

    public long nextLongP(long min, long max)
    {
        long diff = max - min;
        return min + nextLongP(diff + 2) - 1;
    }


    public double nextDouble()
    {
        return (double)next() / uint.MaxValue;
    }

    public double nextDoubleP(double a)
    {
        return Math.Pow(a, nextDouble());
    }
}

Submission Info

Judge Result