From 09883109b9d06bd467967a36292660090a988f32 Mon Sep 17 00:00:00 2001
From: pu2rile <3o920@naver.com>
Date: Thu, 11 Jul 2024 22:13:22 +0900
Subject: [PATCH] 2024-07-11

---
 pu2rile/README.md                             |  4 +++-
 ...24\355\225\231\354\213\235\353\237\211.py" | 22 +++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 "pu2rile/\354\212\244\355\203\235/\355\231\224\355\225\231\354\213\235\353\237\211.py"

diff --git a/pu2rile/README.md b/pu2rile/README.md
index 70f15e8..2376f74 100644
--- a/pu2rile/README.md
+++ b/pu2rile/README.md
@@ -9,4 +9,6 @@
 | 5차시 | 2024.04.10 |  그리디 알고리즘  | [국회의원 선거](https://www.acmicpc.net/problem/1417)  | [#18](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/18#issue-2235862658)
 | 6차시 | 2024.05.10 |  그리디 알고리즘  | [ATM](https://www.acmicpc.net/problem/11399)  | [#25](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/25#issue-2289086909)
 | 7차시 | 2024.05.10 |  완전 탐색 알고리즘  | [영화감독 숌](https://www.acmicpc.net/problem/1436)  | [#26](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/25#issue-2289086909)
-| 8차시 | 2024.05.14 |  그리디 알고리즘  | [팔](https://www.acmicpc.net/problem/1105)  | [#28](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/28#issue-2295901384)
\ No newline at end of file
+| 8차시 | 2024.05.14 |  그리디 알고리즘  | [팔](https://www.acmicpc.net/problem/1105)  | [#28](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/28#issue-2295901384)
+| 9차시 | 2024.05.27 |  구현  | [오늘도 졌다](https://www.acmicpc.net/problem/14582)  | [#29](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/29#issue-2320060288)
+| 10차시 | 2024.07.11 |  스택  | [화학식량](https://www.acmicpc.net/problem/2257)  | [#34]()
\ No newline at end of file
diff --git "a/pu2rile/\354\212\244\355\203\235/\355\231\224\355\225\231\354\213\235\353\237\211.py" "b/pu2rile/\354\212\244\355\203\235/\355\231\224\355\225\231\354\213\235\353\237\211.py"
new file mode 100644
index 0000000..e964f10
--- /dev/null
+++ "b/pu2rile/\354\212\244\355\203\235/\355\231\224\355\225\231\354\213\235\353\237\211.py"
@@ -0,0 +1,22 @@
+chemical = input()
+stack = []
+atomic = {'H':1, 'C':12, 'O':16} # 원자량 딕셔너리
+
+for c in chemical:
+  if c =='(': 
+    stack.append(c)
+  elif c == 'H' or c == 'C' or c == 'O':
+    stack.append(atomic[c]) # 입력받은 원자의 원자량을 스택에 추가
+  elif c == ')':
+    temp = 0 # 닫는 괄호를 만나면 temp 초기화
+    while True:
+      if stack[-1] == '(': # 스택의 top이 여는 괄호면
+        stack.pop() # 스택에서 여는 괄호를 삭제
+        stack.append(temp) # 스택에 temp 추가
+        break
+      else:
+        temp += stack.pop() # 여는 괄호 전까지의 스택 안의 모든 값을 temp에 저장
+  else: # c가 숫자라면
+    stack.append(stack.pop()*int(c)) # 스택의 top 값과 숫자를 곱하여 스택에 추가
+
+print(sum(stack))
\ No newline at end of file