Kotlin Leetcode - 2011. Final Value of Variable After Performing Operations

題目連接

class Solution {
    fun finalValueAfterOperations(operations: Array<String>): Int {
        
    }
}

解題思路

這一題考的是陣列元素的個數計算

我們將 X++ 和 ++X 的個數計算出來後

減去剩餘元素的個數

就可以得到答案

Kotlin 參考解答

class Solution {
    fun finalValueAfterOperations(A: Array<String>) = 
    (A.filter{ it == "X++" || it == "++X" }.size) - (A.size - A.filter{ it == "X++" || it == "++X" }.size)
}

如果希望更加簡潔，移項一下可以得到

class Solution {
    fun finalValueAfterOperations(A: Array<String>) = 
    2 * A.filter{ it == "X++" || it == "++X" }.size - A.size
}

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