#
# Create by Hua on 2/1/22.
#

"""
There is a programming language with only four operations and one variable X:

    ++X and X++ increments the value of the variable X by 1.
    --X and X-- decrements the value of the variable X by 1.

Initially, the value of X is 0.

Given an array of strings operations containing a list of operations,
return the final value of X after performing all the operations.



Example 1:
Input: operations = ["--X","X++","X++"]
Output: 1
Explanation: The operations are performed as follows:
Initially, X = 0.
--X: X is decremented by 1, X =  0 - 1 = -1.
X++: X is incremented by 1, X = -1 + 1 =  0.
X++: X is incremented by 1, X =  0 + 1 =  1.

Example 2:
Input: operations = ["++X","++X","X++"]
Output: 3
Explanation: The operations are performed as follows:
Initially, X = 0.
++X: X is incremented by 1, X = 0 + 1 = 1.
++X: X is incremented by 1, X = 1 + 1 = 2.
X++: X is incremented by 1, X = 2 + 1 = 3.

Example 3:
Input: operations = ["X++","++X","--X","X--"]
Output: 0
Explanation: The operations are performed as follows:
Initially, X = 0.
X++: X is incremented by 1, X = 0 + 1 = 1.
++X: X is incremented by 1, X = 1 + 1 = 2.
--X: X is decremented by 1, X = 2 - 1 = 1.
X--: X is decremented by 1, X = 1 - 1 = 0.



Constraints:
    1 <= operations.length <= 100
    operations[i] will be either "++X", "X++", "--X", or "X--".
"""


class Solution(object):
    def finalValueAfterOperations(self, operations):
        """
        :type operations: List[str]
        :rtype: int

        easy 1 min.
        thought: straightforward, if has +, then ++, if has -, then --
        02/01/2022 15:21	Accepted	72 ms	13.3 MB	python
        """

        ret = 0
        for s in operations:
            if "+" in s:
                ret += 1
            else:
                ret -= 1
        return ret
