add 853-Car-Fleet

javascript/853-Car-Fleet.js

@@ -0,0 +1,25 @@
+function carFleet(target, position, speed) {
+  const combined = position
+    .map((item, index) => {
+      return [item, speed[index]];
+    })
+    .sort((a, b) => a[0] - b[0]);
+
+  const stack = [];
+
+  for (let i = combined.length - 1; i > -1; i--) {
+    const p = combined[i][0];
+    const s = combined[i][1];
+
+    stack.push((target - p) / s);
+
+    if (
+      stack.length >= 2 &&
+      stack[stack.length - 1] <= stack[stack.length - 2]
+    ) {
+      stack.pop();
+    }
+  }
+
+  return stack.length;
+}