2024-03-13

H0ngJu/README.md

@@ -3,5 +3,6 @@
 | 차시  |    날짜    | 문제유형 |                                    링크                                     |                        풀이                         |
 | :---: | :--------: | :------: | :-------------------------------------------------------------------------: | :-------------------------------------------------: |
 | 1차시 | 2024.03.05 |    큐    | [프로세스](https://school.programmers.co.kr/learn/courses/30/lessons/42587) | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/151 |
+| 4차시 | 2024.03.13 |    힙    |               [문제집](https://www.acmicpc.net/problem/1766)                | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/158 |
 
 ---

H0ngJu/힙/문제집.py

@@ -0,0 +1,32 @@
+import sys
+import heapq
+
+n, m = map(int, sys.stdin.readline().rstrip().split())
+
+graph = [[] for _ in range(n+1)]
+inDegree = [0 for _ in range(n+1)]
+q = []
+answer = []
+
+# 입력받아서 넣기
+for _ in range(m):
+    p1, p2 = map(int, sys.stdin.readline().rstrip().split())
+    graph[p1].append(p2) # p1은 p2와 연결된 문제
+    inDegree[p2] += 1 # 간선 추가
+
+# 진입차수가 0이면 큐에 넣기
+for i in range(1, n+1):
+    if inDegree[i] == 0:
+        heapq.heappush(q, i)
+
+# answer에 넣고, 간선 제거
+while q:
+    prob = heapq.heappop(q)
+    answer.append(prob)
+    for i in graph[prob]: # 간선 제거 & 진입차수 0인 것들 처리
+        inDegree[i] -= 1
+        if inDegree[i] == 0:
+            heapq.heappush(q, i)
+
+for result in answer:
+    print(result, end=" ")