Create 1199-minimum-time-to-build-blocks.js

Author: everthis

1199-minimum-time-to-build-blocks.js

@@ -0,0 +1,58 @@
+/**
+ * @param {number[]} blocks
+ * @param {number} split
+ * @return {number}
+ */
+const minBuildTime = function (blocks, split) {
+  const minHeap = new MinHeap()
+  blocks.forEach((block) => minHeap.push(block))
+  while (minHeap.size() > 1) {
+    minHeap.pop()
+    minHeap.push(minHeap.pop() + split)
+  }
+  return minHeap.pop()
+}
+
+class MinHeap {
+  constructor() {
+    this.store = []
+  }
+  size() {
+    return this.store.length
+  }
+  push(value) {
+    this.store.push(value)
+    this.heapifyUp(this.store.length - 1)
+  }
+  pop() {
+    if (this.store.length < 2) return this.store.pop()
+    let result = this.store[0]
+    this.store[0] = this.store.pop()
+    this.heapifyDown(0)
+    return result
+  }
+  heapifyUp(child) {
+    const parent = Math.floor((child - 1) / 2)
+    if (child && this.store[child] < this.store[parent]) {
+      const temp = this.store[child]
+      this.store[child] = this.store[parent]
+      this.store[parent] = temp
+      this.heapifyUp(parent)
+    }
+  }
+  heapifyDown(parent) {
+    const childs = [1, 2]
+      .map((n) => parent * 2 + n)
+      .filter((n) => n < this.store.length)
+    let child = childs[0]
+    if (childs[1] && this.store[childs[1]] < this.store[child]) {
+      child = childs[1]
+    }
+    if (child && this.store[child] < this.store[parent]) {
+      const temp = this.store[child]
+      this.store[child] = this.store[parent]
+      this.store[parent] = temp
+      this.heapifyDown(child)
+    }
+  }
+}