From f05d888a0b621ca4e99e2b0fb6e23c097006fe41 Mon Sep 17 00:00:00 2001 From: Santo Cariotti Date: Tue, 28 May 2024 10:29:13 +0200 Subject: Init --- progs/a170.py | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 progs/a170.py (limited to 'progs/a170.py') diff --git a/progs/a170.py b/progs/a170.py new file mode 100644 index 0000000..2c39536 --- /dev/null +++ b/progs/a170.py @@ -0,0 +1,15 @@ +from collections import deque +def check_expression(exp): + if len(exp) & 1: + return False + stack = deque() + for ch in exp: + if ch == '(' or ch == '{' or ch == '[': + stack.append(ch) + if ch == ')' or ch == '}' or ch == ']': + if not stack: + return False + top = stack.pop() + if (top == '(' and ch != ')') or (top == '{' and ch != '}' or (top == '[' and ch != ']')): + return False + return not stack \ No newline at end of file -- cgit v1.2.3-18-g5258