Merge pull request #359 from Samuel-Hinchliffe/main

neetcode-gh · web-flow · commit 65b898722023 · 2022-07-05T15:02:58.000-07:00
Create 332-Reconstruct-Itinerary.js
diff --git a/javascript/332-Reconstruct-Itinerary.js b/javascript/332-Reconstruct-Itinerary.js
@@ -0,0 +1,44 @@
+/**
+ * @param {string[][]} tickets
+ * @return {string[]}
+ */
+var findItinerary = function (tickets) {
+	const flight_paths = new Map();
+	const flight_path_order = ["JFK"];
+
+	tickets = tickets.sort();
+
+	for (const [source, dest] of tickets) {
+		let edges = [];
+		if (flight_paths.has(source)) {
+			edges = flight_paths.get(source);
+		}
+		edges.push(dest);
+		flight_paths.set(source, edges);
+	}
+
+	const depth_first_search = (city) => {
+		if (flight_path_order.length === tickets.length + 1) return true;
+
+		const cities_to_go_to = flight_paths.get(city) || [];
+		if (!cities_to_go_to.length) return false;
+
+		const cities_copied = Array.from(cities_to_go_to);
+
+		for (const other_city of cities_copied) {
+			flight_path_order.push(other_city);
+			cities_to_go_to.shift();
+
+			if (depth_first_search(other_city)) {
+				return flight_path_order;
+			} else {
+				flight_path_order.pop();
+				cities_to_go_to.push(other_city);
+			}
+		}
+
+		return false;
+	};
+
+	return depth_first_search("JFK");
+};
