Submission #156631

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Source Code Expand

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);

		int maisuu = sc.nextInt();



		int[] cards;
		int[] carddis;
		cards = new int[maisuu];
		carddis = new int[maisuu];

		for(int i = 0; i < maisuu; i++){
			cards[i] = sc.nextInt();
		}

		int answer = 0;
		boolean onlyone = true;
		boolean onlyzero = true;


		for(int i = 0; i < maisuu; i++){
			carddis[i] = Math.abs(cards[i] - i - 1);
			if(carddis[i] != 0){onlyzero = false;}
			if(carddis[i] > 1){onlyone = false;}
		}

		for(int i = 0; i < maisuu; i++){
			if(carddis[i] > 1){
				onlyone = false;
				answer += 1;
			}
		}

		int onenum = 0;
			for(int i = 0; i < maisuu; i++){
				if(carddis[i] == 1){
					onenum = onenum + 1;
				}
			}

		if(onenum / 2 == 0){
			answer = answer + 1;
		}


		if(onlyone){
			answer = 0;

			answer = onenum / 2;
		}
		if(onlyzero){answer = 0;}

		System.out.println(answer);
		
	}
}

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