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Author: hogan-tech

2137-final-value-of-variable-after-performing-operations/2137-final-value-of-variable-after-performing-operations.py

@@ -0,0 +1,22 @@
+# time complexity: O(n)
+# space complexity: O(1)
+from typing import List
+
+
+class Solution:
+    def finalValueAfterOperations(self, operations: List[str]) -> int:
+        count = 0
+        for operation in operations:
+            if operation[0] == '+' or operation[-1] == '+':
+                count += 1
+            else:
+                count -= 1
+        return count
+
+
+operations = ["--X", "X++", "X++"]
+print(Solution().finalValueAfterOperations(operations))
+operations = ["++X", "++X", "X++"]
+print(Solution().finalValueAfterOperations(operations))
+operations = ["X++", "++X", "--X", "X--"]
+print(Solution().finalValueAfterOperations(operations))