💡 프로그래머스 42628 - 이중우선순위큐

Author: yoouyeon

Programmers/Level3/42628_이중우선순위큐.js

@@ -0,0 +1,124 @@
+/* 
+⭐️ 문제 정보 ⭐️
+문제 : 42628 - 이중우선순위큐
+레벨 : Level 3
+링크 : https://school.programmers.co.kr/learn/courses/30/lessons/42628
+*/
+
+// ANCHOR : 26.02.05 풀이
+class Heap {
+  constructor(compare) {
+    this.heap = [];
+    this.compare = compare;
+  }
+
+  size() {
+    return this.heap.length;
+  }
+
+  push(value) {
+    this.heap.push(value);
+    this.siftUp(this.heap.length - 1);
+  }
+
+  pop() {
+    if (this.heap.length === 0) return null;
+    const root = this.heap[0];
+    if (this.heap.length === 1) return this.heap.pop();
+    this.heap[0] = this.heap.pop();
+    this.siftDown(0);
+
+    return root;
+  }
+
+  siftUp(i) {
+    while (i > 0) {
+      const p = Math.floor((i - 1) / 2);
+      if (this.compare(this.heap[i], this.heap[p])) {
+        this.swap(i, p);
+        i = p;
+      } else break;
+    }
+  }
+
+  siftDown(i) {
+    if (this.heap.length === 0) return;
+
+    while (true) {
+      const lc = 2 * i + 1 >= this.heap.length ? null : 2 * i + 1;
+      const rc = 2 * i + 2 >= this.heap.length ? null : 2 * i + 2;
+
+      let c;
+      if (lc === null) break;
+      else if (rc === null) c = lc;
+      else {
+        this.compare(this.heap[lc], this.heap[rc]) ? (c = lc) : (c = rc);
+      }
+
+      if (this.compare(this.heap[c], this.heap[i])) {
+        this.swap(c, i);
+        i = c;
+      } else break;
+    }
+  }
+
+  swap(a, b) {
+    [this.heap[a], this.heap[b]] = [this.heap[b], this.heap[a]];
+  }
+}
+
+function solution(operations) {
+  const minHeap = new Heap((a, b) => a.value < b.value);
+  const maxHeap = new Heap((a, b) => a.value > b.value);
+
+  let id = 0;
+  const deleted = new Set();
+  for (const operation of operations) {
+    const [op, value] = operation.split(" ");
+    if (op === "I") {
+      const num = Number(value);
+      minHeap.push({ id, value: num });
+      maxHeap.push({ id, value: num });
+      id++;
+    } else if (op === "D") {
+      if (value === "1") {
+        // MAX heap에서 삭제
+        while (maxHeap.size() > 0) {
+          const x = maxHeap.pop();
+          if (deleted.has(x.id)) continue;
+          else {
+            deleted.add(x.id);
+            break;
+          }
+        }
+      } else if (value === "-1") {
+        // MIN heap에서 삭제
+        while (minHeap.size() > 0) {
+          const x = minHeap.pop();
+          if (deleted.has(x.id)) continue;
+          else {
+            deleted.add(x.id);
+            break;
+          }
+        }
+      }
+    }
+  }
+
+  function popValid(heap, deleted) {
+    while (heap.size() > 0) {
+      const node = heap.pop();
+      if (node === null) return null;
+      if (deleted.has(node.id)) continue;
+      return node;
+    }
+    return null;
+  }
+
+  const maxNode = popValid(maxHeap, deleted);
+  if (maxNode === null) return [0, 0];
+  const minNode = popValid(minHeap, deleted);
+  if (minNode === null) return [0, 0];
+
+  return [maxNode.value, minNode.value];
+}

Programmers/README.md

@@ -38,6 +38,7 @@
 | 42583 | 다리를 지나는 트럭 | [42583_다리를_지나는_트럭.js](Level2/42583_다리를_지나는_트럭.js) | [🔗](https://school.programmers.co.kr/learn/courses/30/lessons/42583) |
 | 42584 | 주식가격 | [42584_주식가격.js](Level2/42584_주식가격.js) | [🔗](https://school.programmers.co.kr/learn/courses/30/lessons/42584) |
 | 42586 | 기능개발 | [42586_기능개발.js](Level2/42586_기능개발.js) | [🔗](https://school.programmers.co.kr/learn/courses/30/lessons/42586) |
+| 42628 | 이중우선순위큐 | [42628_이중우선순위큐.js](Level3/42628_이중우선순위큐.js) | [🔗](https://school.programmers.co.kr/learn/courses/30/lessons/42628) |
 | 42840 | 모의고사 | [42840_모의고사.js](Level1/42840_모의고사.js) | [🔗](https://school.programmers.co.kr/learn/courses/30/lessons/42840) |
 | 42888 | 오픈채팅방 | [42888_오픈채팅방.js](Level2/42888_오픈채팅방.js) | [🔗](https://school.programmers.co.kr/learn/courses/30/lessons/42888) |
 | 42889 | 실패율 | [42889_실패율.js](Level1/42889_실패율.js) | [🔗](https://school.programmers.co.kr/learn/courses/30/lessons/42889) |