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1051. Height Checker

Description

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: 
heights:  [1,1,4,2,1,3]
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:
heights:  [5,1,2,3,4]
expected: [1,2,3,4,5]
All indices do not match.

Example 3:

Input: heights = [1,2,3,4,5]
Output: 0
Explanation:
heights:  [1,2,3,4,5]
expected: [1,2,3,4,5]
All indices match.

 

Constraints:

  • 1 <= heights.length <= 100
  • 1 <= heights[i] <= 100

Solutions

  • class Solution {
    public int heightChecker(int[] heights) {
        int[] expected = heights.clone();
        Arrays.sort(expected);
        int ans = 0;
        for (int i = 0; i < heights.length; ++i) {
            if (heights[i] != expected[i]) {
                ++ans;
            }
        }
        return ans;
    }
}

  • class Solution {
public:
    int heightChecker(vector<int>& heights) {
        vector<int> expected = heights;
        sort(expected.begin(), expected.end());
        int ans = 0;
        for (int i = 0; i < heights.size(); ++i) ans += heights[i] != expected[i];
        return ans;
    }
};

  • class Solution:
    def heightChecker(self, heights: List[int]) -> int:
        expected = sorted(heights)
        return sum(a != b for a, b in zip(heights, expected))


  • func heightChecker(heights []int) int {
	expected := make([]int, len(heights))
	copy(expected, heights)
	sort.Ints(expected)
	ans := 0
	for i, v := range heights {
		if v != expected[i] {
			ans++
		}
	}
	return ans
}

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