LeetCode Entry

2839. Check if Strings Can be Made Equal With Operations I

29.03.2026 easy 2026 kotlin rust

Match a and b at (0|2,1|3) positions

2839. Check if Strings Can be Made Equal With Operations I easy youtube

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Problem TLDR

Match a and b at (0

2,1

3) positions #easy

Intuition

How short can the code be?

Approach

• Kotlin: setOf, (0..1)
• Rust: bitmask

Complexity

• Time complexity: \(O(1)\)

• Space complexity: \(O(1)\)

Code

// 24ms
    fun canBeEqual(a: String, b: String) =
    (0..1).all { setOf(a[it],a[it+2]) == setOf(b[it],b[it+2]) }

// 0ms
    pub fn can_be_equal(a: String, b: String) -> bool {
        let f = |s: &[u8]| 1<<s[0] | 1<<s[2] | 1<<s[1]+16 | 1<<s[3]+16;
        f(a.as_bytes()) == f(b.as_bytes())
    }