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);
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