# Intuition

To solve this problem, I need to keep track of the value of x and update it according to the operations in the array.

# Approach

I will use a variable x to store the value of x and initialize it to zero. Then I will loop through the array of operations and use a switch statement to check each operation and increment or decrement x accordingly.

# Complexity

• Time complexity:
The time complexity is \$\$O(n)\$\$ where n is the length of the array, because I need to iterate through all the operations once.

• Space complexity:
The space complexity is \$\$O(1)\$\$ because I only use a constant amount of extra space for the variable x.

# Code

``````class Solution {
public int finalValueAfterOperations(String[] operations) {
int x = 0;
int size = operations.length; // store the size of the array
for (int i = 0; i < size; i++) { // use the size variable
String operation = operations[i]; // store the operation in a variable
switch (operation) { // use switch statement
case "++X":
case "X++":
x++;
break;
case "--X":
case "X--":
x--;
break;
}
}
return x;
}
}

``````