Minimum Replacements to Sort the Array LeetCode Solution

Problem – Minimum Replacements to Sort the Array LeetCode Solution

You are given a 0-indexed integer array nums. In one operation you can replace any element of the array with any two elements that sum to it.

• For example, consider nums = [5,6,7]. In one operation, we can replace nums[1] with 2 and 4 and convert nums to [5,2,4,7].

Return the minimum number of operations to make an array that is sorted in non-decreasing order.

Example 1:

Input: nums = [3,9,3]
Output: 2
Explanation: Here are the steps to sort the array in non-decreasing order:
- From [3,9,3], replace the 9 with 3 and 6 so the array becomes [3,3,6,3]
- From [3,3,6,3], replace the 6 with 3 and 3 so the array becomes [3,3,3,3,3]
There are 2 steps to sort the array in non-decreasing order. Therefore, we return 2.

Example 2:

Input: nums = [1,2,3,4,5]
Output: 0
Explanation: The array is already in non-decreasing order. Therefore, we return 0.

Constraints:

• 1 <= nums.length <= 105
• 1 <= nums[i] <= 109

Minimum Replacements to Sort the Array LeetCode Solution in Java

    public long minimumReplacement(int[] A) {
        long x = 1000000000, res = 0, k;
        for (int i = A.length - 1; i >= 0; --i) {
            k = (A[i] + x - 1) / x;
            x = A[i] / k;
            res += k - 1;
        }
        return res;
    }

Minimum Replacements to Sort the Array LeetCode Solution in C++

    long long minimumReplacement(vector<int>& A) {
        long n = A.size(), x = 1e9, res = 0, k;
        for (int i = n - 1; i >= 0; --i) {
            k = (A[i] + x - 1) / x;
            x = A[i] / k;
            res += k - 1;
        }
        return res;
    }

Minimum Replacements to Sort the Array LeetCode Solution in Python

    def minimumReplacement(self, A):
        x = A[-1]
        res = 0
        for a in reversed(A):
            k = (a + x - 1) // x
            x = a // k
            res += k - 1
        return res

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