Решение

class Solution {
    fun isPathCrossing(path: String): Boolean {
        var x = 0
        var y = 0
        val visited = mutableSetOf<Pair<Int, Int>>()
        visited.add(0 to 0)
        for (c in path) {
            when (c) {
                'N' -> y++
                'S' -> y--
                'E' -> x++
                'W' -> x--
            }
            if (!visited.add(x to y)) return true
        }
        return false
    }
}