From 301d70cf8c0814897b2f8822b5fee8b272f46e9e Mon Sep 17 00:00:00 2001
From: Mhrooz <cxyoz@outlook.com>
Date: Sat, 25 May 2024 12:01:35 +0200
Subject: [PATCH] pass 141 easy
---
141-240525-pass/main.py | 21 +++++++++++++++++++++
20-240526-pass/main.py | 42 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 63 insertions(+)
create mode 100644 141-240525-pass/main.py
create mode 100644 20-240526-pass/main.py
diff --git a/141-240525-pass/main.py b/141-240525-pass/main.py
new file mode 100644
index 0000000..0c3146c
--- /dev/null
+++ b/141-240525-pass/main.py
@@ -0,0 +1,21 @@
+# Definition for singly-linked list.
+class ListNode:
+ def __init__(self, x):
+ self.val = x
+ self.next = None
+
+# Definition for singly-linked list.
+# class ListNode:
+# def __init__(self, x):
+# self.val = x
+# self.next = None
+class Solution:
+ def hasCycle(self, head: Optional[ListNode]) -> bool:
+ cnt = 0
+ if head == None: return False
+ while cnt < 1e4+10:
+ if head.next == None:
+ return False
+ head = head.next
+ cnt += 1
+ return True
\ No newline at end of file
diff --git a/20-240526-pass/main.py b/20-240526-pass/main.py
new file mode 100644
index 0000000..2b490ec
--- /dev/null
+++ b/20-240526-pass/main.py
@@ -0,0 +1,42 @@
+class Solution:
+ def isValid(self, s: str) -> bool:
+ def rcg_type(ch) -> int:
+ if ch[0] =='(':
+ return 1
+ if ch[0] ==')':
+ return 2
+ if ch[0] =='{':
+ return 3
+ if ch[0] =='}':
+ return 4
+ if ch[0] =='[':
+ return 5
+ if ch[0] ==']':
+ return 6
+ stack = []
+ top_idx = -1
+ def is_empty():
+ return top_idx == -1
+ def set_ele(stack: list, idx: int, ele: int):
+ if len(stack) <= idx:
+ stack.append(ele)
+ else:
+ stack[idx] = ele
+ for ch in s:
+ tp = rcg_type(ch)
+ if tp % 2 == 1:
+ top_idx += 1
+ set_ele(stack, top_idx, tp)
+ else:
+ if is_empty(): return False
+ top_ele = stack[top_idx]
+ if tp - top_ele != 1: return False
+ top_idx -= 1
+ if not is_empty(): return False
+ return True
+
+sol = Solution()
+print(sol.isValid("()"))
+print(sol.isValid("(){}[]"))
+print(sol.isValid("(]"))
+print(sol.isValid("[(])"))