Class Solution
Easy
There is a programming language with only four operations and one variable X
:
++X
andX++
increments the value of the variableX
by1
.--X
andX--
decrements the value of the variableX
by1
.
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--"
.
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Constructor Summary
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Method Summary
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Constructor Details
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Solution
public Solution()
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Method Details
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finalValueAfterOperations
public int finalValueAfterOperations(java.lang.String[] operations)
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