ABB to BA (Hard) 풀이

Author: saebyeok0306

BAEKJOON/3Gold/ABB to BA (Hard).py

@@ -0,0 +1,62 @@
+# 자료 구조, 문자열, 스택
+# https://www.acmicpc.net/problem/32293
+
+"""
+4
+3
+ABB
+9
+ABABABBBB
+12
+AAAAAABBBBBB
+12
+AAAABBBBBBBB
+
+BA
+BAABA
+AAAABABA
+ABAAA
+"""
+
+import sys
+from collections import deque
+
+input = sys.stdin.readline
+T = int(input())
+A = []
+
+def logic(size, stack1, stack2):
+    if size > 1:
+        if stack1[size] == "B" and stack1[size-1] == "B" and stack1[size-2] == "A":
+            stack2.append("A")
+            stack2.append("B")
+            stack1.pop()
+            stack1.pop()
+            stack1.pop()
+            return size-3
+    return size
+
+for _ in range(T):
+    l = int(input())
+    S = list(input().rstrip())
+
+    size = -1
+    stack1 = deque()
+    stack2 = deque() # 삽입대기
+
+    for s in S:
+        size += 1
+        stack1.append(s)
+
+        if size < 2:
+            continue
+        
+        size = logic(size, stack1, stack2)
+        while stack2:
+            size += 1
+            stack1.append(stack2.pop())
+            size = logic(size, stack1, stack2)
+    
+    A.append("".join(stack1))
+
+print("\n".join(A))