Completed 'AngryFrogs' puzzle

Author: Ryo112358

Playground/Puzzles/AngryFrogs.test.ts

@@ -0,0 +1,28 @@
+import { assertEquals } from '../../test_deps.ts';
+
+import maxDistance from './AngryFrogs.ts';
+
+
+// RUN: deno test Playground/Puzzles/AngryFrogs.test.ts
+
+//---------------------------------------------------------------------
+// ----------                  UNIT TESTS                    ----------
+//---------------------------------------------------------------------
+
+Deno.test({
+    name: "[1,2,3,4,5] -> 4",
+    fn() {
+        let lilypadHeights = [1,2,3,4,5];
+        assertEquals(maxDistance(lilypadHeights), 4);
+    }
+});
+
+
+
+Deno.test({
+    name: "[5,7,3,1,2,3,4,6,2] -> 6",
+    fn() {
+        let lilypadHeights = [5,7,3,1,2,3,4,6,2];
+        assertEquals(maxDistance(lilypadHeights), 6);
+    }
+});

Playground/Puzzles/AngryFrogs.ts

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+export default function maxDistance(lilypadHeights: number[]) {
+    Solution.initializeLilypadForest(lilypadHeights);
+    return Solution.findMaxDistance();
+}
+
+class Solution {
+
+    private static lilypadForest: number[];
+
+    static initializeLilypadForest(lilypadHeights: number[]) {
+        Solution.lilypadForest = lilypadHeights;
+    }
+
+    static findMaxDistance(): number {
+
+        let maxDistance = 0;
+
+        let distanceTraveledLeft, distanceTraveledRight, distanceTraveled;
+
+        for(let i=0; i < Solution.lilypadForest.length; ++i) {
+            // console.log("Lilypad", i);
+            distanceTraveledRight = Solution._travelRightFrom(i);
+            distanceTraveledLeft = Solution._travelLeftFrom(i);
+
+            distanceTraveled = distanceTraveledLeft + distanceTraveledRight;
+
+            // console.log("    Distance Traveled:", distanceTraveled)
+
+            if(distanceTraveled > maxDistance)
+                maxDistance = distanceTraveled;
+
+            // console.log("  Max Distance:", maxDistance)
+        }
+
+        return maxDistance;
+    }
+
+    private static _travelRightFrom(index: number): number {
+        for(let i=index; ; ++i) {
+            if(i+1 == Solution.lilypadForest.length ||
+                Solution.lilypadForest[i+1] < Solution.lilypadForest[i]) {
+                    // console.log("  Traveled Right: ", i-index);
+                    return i-index;
+                }
+        }
+    }
+
+    private static _travelLeftFrom(index: number): number {
+        for(let i=index; ; --i) {
+            if(i-1 < 0 || Solution.lilypadForest[i-1] < Solution.lilypadForest[i]) {
+                // console.log("  Traveled Left: ", index-i);
+                return index-i;
+            }
+        }
+    }
+}
+
+//---------------------------------------------------------------------
+// ----------                 MAIN PROGRAM                   ----------
+//---------------------------------------------------------------------
+if (import.meta.main) {
+
+    let forest1 = [5,7,3,1,2,3,4,6,2];
+    console.log("Forest 1: ", maxDistance(forest1));
+
+    // RUN:   deno run Playground/Puzzles/AngryFrogs.ts
+}