Решение

class Solution {
    fun isSubsequence(s: String, t: String): Boolean {
        val n = s.length
        if (n == 0) return true
        if (n > t.length) return false
        var i = 0
        for (c in t) {
            if (c == s[i]) {
                i++
                if (i == n) return true
            }
        }
        return false
    }
}