[PROGRAMMERS]ダーツゲーム

public int solution(String dartResult) {
	int answer = 0;
    
	int arr[] = new int[3];
	String temp = "";
	int idx = 0;
    
	for(int i = 0; i < dartResult.length(); i++){
		switch(dartResult.charAt(i)){
			case '*':
				arr[idx-1]*=2;
				if(idx >1) arr[idx-2]*=2;
				break;
			case '#':
				arr[idx-1]*=-1;
				break;
			case 'S':
				arr[idx] = (int)Math.pow(Integer.parseInt(temp),1);
				idx++;
				temp ="";
				break;
			case 'D':
				arr[idx] = (int)Math.pow(Integer.parseInt(temp),2);
				idx++;
				temp ="";
				break;
			case 'T':
				arr[idx] = (int)Math.pow(Integer.parseInt(temp),3);
				idx++;
				temp ="";
				break;
			default:
				temp+=String.valueOf(dartResult.charAt(i));
				break;
		}
	}
	for(int i =0;i<arr.length;i++){
		answer+=arr[i];
	}
	return answer;
}