Leetcode•Apr 27, 2026

Ransom Note

Hazrat Ali

Leetcode

Given two strings ransomNote and magazine, return true if ransomNote can be constructed by using the letters from magazine and false otherwise.

Each letter in magazine can only be used once in ransomNote.

 

Example 1:

Input: ransomNote = "a", magazine = "b"
Output: false

Example 2:

Input: ransomNote = "aa", magazine = "ab"
Output: false

Example 3:

Input: ransomNote = "aa", magazine = "aab"
Output: true

Solution
var canConstruct = function(ransomNote, magazine) {
    let count = new Array(26).fill(0);

    for (let ch of magazine) {
        count[ch.charCodeAt(0) - 97]++;
    }

    for (let ch of ransomNote) {
        let idx = ch.charCodeAt(0) - 97;

        if (count[idx] === 0) return false;

        count[idx]--;
    }

    return true;
};



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