repalceSum has return type of (int) but in main() . we are calling it has void return type . how is this true?
Replacement Sum
@Kameilirshad the return type is used for recursive calls as it used in updating value of each node. but we dont really need that value in the main function. so we dont store it anywhere. we could write int a = replacesum(root)
but we dont need that value, so we simply dont store it.
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