Create 1496-path-crossing.kt

Author: a93a

kotlin/1496-path-crossing.kt

@@ -0,0 +1,24 @@
+class Solution {
+    fun isPathCrossing(path: String): Boolean {
+        var dirs = mapOf(
+            'N' to intArrayOf(0, 1),
+            'S' to intArrayOf(0, -1),
+            'E' to intArrayOf(1, 0),
+            'W' to intArrayOf(-1, 0),
+        )
+        val visit = HashSet<Pair<Int, Int>>()
+        var x = 0
+        var y = 0
+
+        for (c in path) {
+            visit.add(x to y)
+            val (dx, dy) = dirs[c]!!
+            x += dx
+            y += dy
+            if ((x to y) in visit)
+                return true
+        }
+
+        return false
+    }
+}