2011. Final Value of Variable After Performing Operations

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--".

2011. Final Value of Variable After Performing Operations
struct Solution;

impl Solution {
    fn final_value_after_operations(operations: Vec<String>) -> i32 {
        let mut res = 0;
        for op in operations {
            if op.contains('+') {
                res += 1;
            } else {
                res -= 1;
            }
        }
        res
    }
}

#[test]
fn test() {
    let operations = vec_string!["--X", "X++", "X++"];
    let res = 1;
    assert_eq!(Solution::final_value_after_operations(operations), res);
    let operations = vec_string!["++X", "++X", "X++"];
    let res = 3;
    assert_eq!(Solution::final_value_after_operations(operations), res);
    let operations = vec_string!["X++", "++X", "--X", "X--"];
    let res = 0;
    assert_eq!(Solution::final_value_after_operations(operations), res);
}