feat: 0094 bellman-ford python solution

problems/kamacoder/0094.城市间货物运输I.md

@@ -451,6 +451,33 @@ public class Main {
 ```
 
 ### Python
+```Python
+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  # 起点处距离为0
+    
+    for i in range(1, n):
+        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 not updated:  # 若边不再更新，即停止回圈
+            break
+    
+    if minDist[-1] == float("inf"):  # 返还终点权重
+        return "unconnected"
+    return minDist[-1]
+    
+if __name__ == "__main__":
+    print(main())
+```
 
 ### Go