1051. Height Checker
Easy
A school is trying to take an annual photo of all the students. The students are asked to stand in a single file line in non-decreasing order by height. Let this ordering be represented by the integer array expected where expected[i] is the expected height of the ith student in line.
You are given an integer array heights representing the current order that the students are standing in. Each heights[i] is the height of the ith student in line (0-indexed).
Return the number of indices where heights[i] != expected[i].
Example 1:
Input: heights = [1,1,4,2,1,3]
Output: 3
Explanation:
expected: [1,1,1,2,3,4]
Indices 2, 4, and 5 do not match.
Example 2:
Input: heights = [5,1,2,3,4]
Output: 5
Explanation:
expected: [1,2,3,4,5]
All indices do not match.
Example 3:
Input: heights = [1,2,3,4,5]
Output: 0
Explanation:
expected: [1,2,3,4,5]
All indices match.
Constraints:
1 <= heights.length <= 100
1 <= heights[i] <= 100
Solution:
/**
* @param Integer[] $heights
* @return Integer
*/
function heightChecker($heights) {
$ans = 0;
$currentHeight = 1;
$count = array_fill(0, 101, 0);
foreach ($heights as $height) {
$count[$height]++;
}
foreach ($heights as $height) {
while ($count[$currentHeight] == 0) {
$currentHeight++;
}
if ($height != $currentHeight) {
$ans++;
}
$count[$currentHeight]–;
}
return $ans;
}
}
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