func heightChecker(heights []int) int {
count := [101]int{}
for _, ele := range heights {
count[ele]++
}
for i := 1; i < 101; i++ {
count[i] += count[i-1]
}
sum := 0
for i, ele := range heights {
if count[ele-1] > i || i >= count[ele] {
sum++
}
}
return sum
}