feat: 0094 python solution SPFA

Author: sunlight0602

problems/kamacoder/0094.城市间货物运输I-SPFA.md

@@ -425,7 +425,44 @@ public class Main {
 ```
 
 ### Python
-
+```Python
+import collections
+
+def main():
+    n, m = map(int, input().strip().split())
+    edges = []
+    for _ in range(m):
+        src, dest, weight = map(int, input().strip().split())
+        edges.append([src, dest, weight])
+    
+    minDist = [float("inf")] * (n + 1)
+    minDist[1] = 0
+    que = collections.deque([1])
+    visited = [False] * (n + 1)
+    visited[1] = True
+    
+    while que:
+        cur = que.popleft()
+        visited[cur] = True
+        updated = False
+        for src, dest, weight in edges:
+            if minDist[src] != float("inf") and minDist[src] + weight < minDist[dest]:
+                minDist[dest] = minDist[src] + weight
+                updated = True
+                if visited[dest] == False:
+                    que.append(dest)
+                    visited[dest] = True
+        
+        if not updated:
+            break
+    
+    if minDist[-1] == float("inf"):
+        return "unconnected"
+    return minDist[-1]
+
+if __name__ == "__main__":
+    print(main())
+```
 ### Go
 
 ### Rust