LeetCode Entry

2011. Final Value of Variable After Performing Operations

20.10.2025 easy 2025 kotlin rust

do ++ or -- operation from 0

2011. Final Value of Variable After Performing Operations easy blog post substack youtube

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Problem TLDR

do ++ or – operation from 0 #easy

Intuition

Simulate the process.

Approach

• just check ‘+’ in string

Complexity

• Time complexity: \(O(n)\)

• Space complexity: \(O(1)\)

Code

// 7ms
    fun finalValueAfterOperations(o: Array<String>) =
        2 * o.count { '+' in it } - o.size

// 1ms
    pub fn final_value_after_operations(o: Vec<String>) -> i32 {
        (o.join("").matches('+').count() - o.len()) as _
    }