java

public int [] ex4_8(int [] a, int idx, int n){

    	int num[] = new int[idx];
		ArrayList<Integer> hoge = new ArrayList<Integer>();
	    for(int i=0;i<= a.length-1;i++){
	    		hoge.add(a[i]);
	        }
	    //
		for(int j= idx;j< n+idx;j++){
			if (idx != n) {
				hoge.remove(idx);
			}
	 	}
		//
	    int [] ret = new int[hoge.size()];
	    for (int s = 0; s < ret.length;s++){
	        ret[s] = hoge.get(s);
	    }
        return ret;
    }