[LeetCode] 2011. Final Value of Variable After Performing Operations c++

• 문제

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.

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.

 

 

• 문제 해결

class Solution {
public:
    int finalValueAfterOperations(vector<string>& operations) {
        
        int result(0);
        for(const auto &it : operations){
            if(it[1] == '+')
                result += 1;
            else
                result -= 1;
        }
        return result;
    }
};

다른 풀이

class Solution {
public:
    int finalValueAfterOperations(vector<string>& operations) {
        
        int result(0);
        for(const auto &it : operations){
            result = it[1] == '-' ? result - 1 : result + 1;
        }
        return result;
    }
};