[Lesson] 4. FrogRiverOne

소스코드 

Map<Integer, Integer> xCnt = new HashMap();
int cntResult = -1;
for(int i = 0; i < A.length ; i ++){
	if(A[i] <= X){
		xCnt.put(A[i], 0);
		if(xCnt.size() == X){
			cntResult = i;
			break;
		}
	}
}

System.out.println(cntResult);