Day 3 - Ransom Note

Solution.kt

class Solution {
    fun canConstruct(ransomNote: String, magazine: String): Boolean {
        var m = HashMap<Char, Int>()
        
        magazine.forEach {
            if (m.containsKey(it)) {
                m[it] = m[it]!!.plus(1)
            } else {
                m[it] = 1
            }
        }
        
        ransomNote.forEach {
            if (m.containsKey(it) && m.get(it)!! > 0) {
                m[it] = m[it]!!.minus(1)
            } else {
                return false
            }
        }
        return true
    }
}