252nd Commit

README.md

@@ -283,9 +283,10 @@ Ace Coding Interview with 75 Qs
 | Intervals                                       |                 |        |
 | ----------------------------------------------- | --------------- | ------ |
 | 435. Non-overlapping Intervals                  | [Solution][435] | Medium |
-| 452. Minimum Number of Arrows to Burst Balloons | Solution        | Medium |
+| 452. Minimum Number of Arrows to Burst Balloons | [Solution][452] | Medium |
 
 [435]: ./src/page-5/435.%20Non-overlapping%20Intervals/eraseOverlapIntervals.ts
+[452]: ./src/page-5/452.%20Minimum%20Number%20of%20Arrows%20to%20Burst%20Balloons/findMinArrowShots.ts
 
 | Monotonic Stack         |          |        |
 | ----------------------- | -------- | ------ |
@@ -385,12 +386,14 @@ Must-do List for Interview Prep
 
 [1]: ./src/page-1/1.%20Two%20Sum/twoSum.ts
 
-| Intervals                                       |          |        |
-| ----------------------------------------------- | -------- | ------ |
-| 228. Summary Ranges                             | Solution | Easy   |
-| 56. Merge Intervals                             | Solution | Medium |
-| 57. Insert Interval                             | Solution | Medium |
-| 452. Minimum Number of Arrows to Burst Balloons | Solution | Medium |
+| Intervals                                       |                 |        |
+| ----------------------------------------------- | --------------- | ------ |
+| 228. Summary Ranges                             | Solution        | Easy   |
+| 56. Merge Intervals                             | Solution        | Medium |
+| 57. Insert Interval                             | Solution        | Medium |
+| 452. Minimum Number of Arrows to Burst Balloons | [Solution][452] | Medium |
+
+[452]: ./src/page-5/452.%20Minimum%20Number%20of%20Arrows%20to%20Burst%20Balloons/findMinArrowShots.ts
 
 | Stack                                 |                 |        |
 | ------------------------------------- | --------------- | ------ |

src/page-5/452. Minimum Number of Arrows to Burst Balloons/findMinArrowShots.test.ts

@@ -0,0 +1,32 @@
+import { findMinArrowShots } from './findMinArrowShots';
+
+describe('452. Minimum Number of Arrows to Burst Balloons', () => {
+  test('findMinArrowShots', () => {
+    expect(
+      findMinArrowShots([
+        [10, 16],
+        [2, 8],
+        [1, 6],
+        [7, 12],
+      ]),
+    ).toBe(2);
+
+    expect(
+      findMinArrowShots([
+        [1, 2],
+        [3, 4],
+        [5, 6],
+        [7, 8],
+      ]),
+    ).toBe(4);
+
+    expect(
+      findMinArrowShots([
+        [1, 2],
+        [2, 3],
+        [3, 4],
+        [4, 5],
+      ]),
+    ).toBe(2);
+  });
+});

src/page-5/452. Minimum Number of Arrows to Burst Balloons/findMinArrowShots.ts

@@ -0,0 +1,25 @@
+type FindMinArrowShots = (points: number[][]) => number;
+
+/**
+ * Accepted
+ */
+export const findMinArrowShots: FindMinArrowShots = (points) => {
+  // Sort the balloons by their end positions
+  points.sort((a, b) => a[1] - b[1]);
+
+  // Initialize the number of arrows needed and the position of the last arrow shot
+  let arrows = 1;
+  let arrowPosition = points[0][1];
+
+  // Iterate through each balloon
+  for (let i = 1; i < points.length; i++) {
+    // If the current balloon's start is greater than the last arrow position
+    if (points[i][0] > arrowPosition) {
+      // We need a new arrow
+      arrows += 1;
+      arrowPosition = points[i][1]; // Update the arrow position to the current balloon's end
+    }
+  }
+
+  return arrows;
+};