453. Minimum Moves to Equal Array Elements

Medium

Given an integer array nums of size n, return the minimum number of moves required to make all array elements equal.

In one move, you can increment n - 1 elements of the array by 1.

Example 1:

Input: nums = [1,2,3]
Output: 3
Explanation: Only three moves are needed (remember each move increments two elements):
[1,2,3]  =>  [2,3,3]  =>  [3,4,3]  =>  [4,4,4]

Example 2:

Input: nums = [1,1,1]
Output: 0

Constraints:

• n == nums.length

• 1 <= nums.length <= 10^5

• -10^9 <= nums[i] <= 10^9

• The answer is guaranteed to fit in a 32-bit integer.

解題

func minMoves(nums []int) int {
    // sum - length*min
    minv := nums[0]
    sum := 0

    for _, n := range nums {
        sum += n
        minv = min(minv, n)
    }

    return sum -len(nums)*minv
}

func min(a, b int) int {
    if a < b { return a }
    return b 
}