백준 2252번 줄 세우기

문제 링크: https://www.acmicpc.net/problem/2252

Author: skysign

백준 2252번 줄 세우기 v2/main.py

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+import sys
+from collections import defaultdict
+
+
+def solve():
+    input = sys.stdin.readline
+    N, M = map(int, input().strip().split())
+    edges_fr2to = defaultdict(list)
+    incoming = [0 for _ in range(N + 1)]
+
+    for _ in range(M):
+        fr, to = map(int, input().strip().split())
+        edges_fr2to[fr].append(to)
+        incoming[to] += 1
+
+    queue = []
+    for n in range(1, N + 1):
+        if incoming[n] == 0:
+            queue.append(n)
+
+    ans = []
+    while queue:
+        fr = queue.pop(0)
+        ans.append(fr)
+
+        while edges_fr2to[fr]:
+            to = edges_fr2to[fr].pop(0)
+            incoming[to] -= 1
+            if incoming[to] == 0:
+                queue.append(to)
+
+    print(' '.join(map(str, ans)))
+
+
+if __name__ == '__main__':
+    solve()

백준 2252번 줄 세우기 v2/test1.txt

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+3 2
+1 3
+2 3

백준 2252번 줄 세우기 v2/test1_answer.txt

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+1 2 3

백준 2252번 줄 세우기 v2/test2.txt

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+4 2
+4 2
+3 1

백준 2252번 줄 세우기 v2/test2_answer.txt

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+4 2 3 1

백준 2252번 줄 세우기 v2/test_main.py

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+import sys
+from pathlib import Path
+from unittest import TestCase
+from main import solve
+
+
+class Test(TestCase):
+    def my_solve(self, testcase_input):
+        sys.stdin = open(testcase_input, 'r')
+        stdout = sys.stdout
+        sys.stdout = open('stdout.txt', 'w')
+        solve()
+        sys.stdout.close()
+        sys.stdout = stdout
+
+    def test_solve(self, testcase_number: str):
+        self.my_solve('test' + testcase_number + '.txt')
+        self.assertEqual(
+            Path('test' + testcase_number + '_answer.txt').read_text().strip(),
+            Path('stdout.txt').read_text().strip())
+
+    def test1_solve(self):
+        self.test_solve('1')
+
+    def test2_solve(self):
+        self.test_solve('2')