restructure zeta/** to storage/zeta/**

storage/zeta/py/completed/1167.py

@@ -0,0 +1,47 @@
+import sys
+
+input = sys.stdin.readline
+
+
+def longest(E, start) -> tuple[int, int]:
+    D = []
+
+    M = 0
+    V_M = 0
+    D.append((start, [start], 0))  # now, visited, accumulated
+
+    while D:
+        now, visited, accumulated = D.pop(0)
+        flag = True
+        for e in E[now]:
+            target, cost = e[0], e[1]
+            if target not in visited:
+                flag = False
+                D.append((target, visited + [target], cost + accumulated))
+
+        if flag:
+            if accumulated > M:
+                M = accumulated
+                V_M = now
+
+    return V_M, M
+
+
+def solve(V, E):
+    first = longest(E, 1)[0]
+    _, diameter = longest(E, first)
+
+    return diameter
+
+
+if __name__ == "__main__":
+    V = int(input())
+    E = {}
+    for _ in range(V):
+        _i = list(map(int, input().split()))
+        E[_i[0]] = []
+
+        for i, v in zip(_i[1:-1:2], _i[2:-1:2]):
+            E[_i[0]].append((i, v))
+
+    print(solve(V, E))