reorganize dir

Signed-off-by: Mia Steinkirch <mia.steinkirch@gmail.com>

ebook_src/real_interview_problems/balanced.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+def balance_par_str_with_stack(str1):
+    i, stack = 0, []
+
+    while i < len(str1):
+        symbol = str1[i]
+        if symbol == "(":
+            stack.append(symbol)
+        elif symbol == ")":
+            stack.pop()
+        i += 1
+    return not stack
+
+
+
+if __name__ == '__main__':
+    print(balance_par_str_with_stack('((()))'))
+    print(balance_par_str_with_stack('(()'))