solved(python): baekjoon 1753

Author: himitery

baekjoon/python/1753/__init__.py

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+import heapq
+import math
+import sys
+
+from collections import defaultdict
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.v, self.e = map(int, read().split())
+        self.k = int(read())
+
+        self.graph = defaultdict(list)
+        for start, end, distance in [map(int, read().split()) for _ in range(self.e)]:
+            self.graph[start].append((end, distance))
+
+    def solve(self) -> None:
+        distances = self.dijkstra()
+
+        for vertex in range(self.v):
+            print(distances[vertex] if distances[vertex] != math.inf else "INF")
+
+    def dijkstra(self) -> list[float]:
+        queue, distances = [(0, self.k)], [0 if idx == self.k else math.inf for idx in range(self.v + 1)]
+
+        while queue:
+            current_distance, current_vertex = heapq.heappop(queue)
+
+            if current_distance > distances[current_vertex]:
+                continue
+
+            for next_vertex, distance in self.graph[current_vertex]:
+                next_distance = current_distance + distance
+                if next_distance < distances[next_vertex]:
+                    distances[next_vertex] = next_distance
+                    heapq.heappush(queue, (next_distance, next_vertex))
+
+        return distances[1:]
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/1753/main.py

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+[
+  {
+    "input": [
+      "5 6",
+      "1",
+      "5 1 1",
+      "1 2 2",
+      "1 3 3",
+      "2 3 4",
+      "2 4 5",
+      "3 4 6"
+    ],
+    "expected": [
+      "0",
+      "2",
+      "3",
+      "7",
+      "INF"
+    ]
+  }
+]

baekjoon/python/1753/sample.json

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+import json
+import os.path
+import unittest
+from io import StringIO
+from unittest.mock import patch
+
+from parameterized import parameterized
+
+from main import Problem
+
+
+def load_sample(filename: str):
+    path = os.path.join(os.path.dirname(os.path.abspath(__file__)), filename)
+
+    with open(path, "r") as file:
+        return [(case["input"], case["expected"]) for case in json.load(file)]
+
+
+class TestCase(unittest.TestCase):
+    @parameterized.expand(load_sample("sample.json"))
+    def test_case(self, case: str, expected: list[str]):
+        # When
+        with (
+            patch("sys.stdin.readline", side_effect=case),
+            patch("sys.stdout", new_callable=StringIO) as output,
+        ):
+            Problem().solve()
+
+            result = output.getvalue().rstrip()
+
+        # Then
+        self.assertEqual("\n".join(expected), result)
+
+
+if __name__ == "__main__":
+    unittest.main()