CCF-CSP模拟试题201803-2 碰撞的小球 java

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        int[] pos = new int[100];
        int i = 0, n, L, t;

        Scanner s = new Scanner(System.in);
        n = s.nextInt();
        L = s.nextInt();
        t = s.nextInt();

        for (i=0; i<n; i++){
            pos[i] = s.nextInt();
        }

        while (t > 0){
            for (i=0; i<n; i++){
                if(pos[i] < L){
                    pos[i] += 1;
                }else{
                    pos[i] = -pos[i];
                    pos[i] += 1;
                }
            }
            change(pos, n);
            t--;
        }
    for (i=0; i < n; i++){
        System.out.printf("%d ",Math.abs(pos[i]));
    }

    }
    public static void change(int arr[],int n){
        int i, j;
        for (i=0; i<n; i++){
            for (j=i+1; j<n; j++){
                if (Math.abs(arr[i])==Math.abs(arr[j])){
                    arr[i] = -arr[i];
                    arr[j] = -arr[j];
                    break;
                }
            }
        }

    }



}