2357-MakeArrayZeroBySubtractingEqualAmounts.go

package main

// 2357. Make Array Zero by Subtracting Equal Amounts
// You are given a non-negative integer array nums. In one operation, you must:
//     1. Choose a positive integer x such that x is less than or equal to the smallest non-zero element in nums.
//     2. Subtract x from every positive element in nums.

// Return the minimum number of operations to make every element in nums equal to 0.

// Example 1:
// Input: nums = [1,5,0,3,5]
// Output: 3
// Explanation:
// In the first operation, choose x = 1. Now, nums = [0,4,0,2,4].
// In the second operation, choose x = 2. Now, nums = [0,2,0,0,2].
// In the third operation, choose x = 2. Now, nums = [0,0,0,0,0].

// Example 2:
// Input: nums = [0]
// Output: 0
// Explanation: Each element in nums is already 0 so no operations are needed.

// Constraints:
//     1 <= nums.length <= 100
//     0 <= nums[i] <= 100

import "fmt"

func minimumOperations(nums []int) int {
    mp := make(map[int]int)
    for _, v := range nums { 
        if v != 0 { 
            mp[v]++ // 统计出有多少非0的数值类型即可
        } 
    }
    return len(mp)
}

func main() {
    // Example 1:
    // Input: nums = [1,5,0,3,5]
    // Output: 3
    // Explanation:
    // In the first operation, choose x = 1. Now, nums = [0,4,0,2,4].
    // In the second operation, choose x = 2. Now, nums = [0,2,0,0,2].
    // In the third operation, choose x = 2. Now, nums = [0,0,0,0,0].
    fmt.Println(minimumOperations([]int{1,5,0,3,5})) // 3
    // Example 2:
    // Input: nums = [0]
    // Output: 0
    // Explanation: Each element in nums is already 0 so no operations are needed.
    fmt.Println(minimumOperations([]int{0})) // 0
}