Check for Balanced Parentheses using Stack – Java Code

Write a java code to check for balanced parentheses using stack. Given an expression containing characters ‘{‘,’}’,'(‘,’)’,'[‘,’]’. We have to write a java code to check whether an input string has valid parentheses.

An input string is valid if:

Open brackets must be closed by the same type of brackets.
Open brackets must be closed in the correct order.

Example –

i) {[]}) – Invalid
ii) {()}[] – Valid

Binary Search in PHP : Explain with Code Examples

Write a program to implement binary search in PHP. Given a sorted array, we have to write a PHP code to search an element using binary search algorithm.

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Find First Non-repeated Character in a String – Java Code

Write a java program to find first non-repeated character in a string. Given an input string, find it’s first non-repeated character in a string.

For example –

i) Input string – java
Output – j (j is the first non-repeating character in a string)

ii) Input string – web rewrite
Output – b (b is the first non-repeating character in a string)

Swap Two Numbers in PHP – Explain with Code Examples

Write a PHP script to swap two numbers. In this tutorial, we are going to write a code to swap two numbers in PHP.

There are multiple approaches by which you can swap two numbers.

i) We can swap two numbers using third or temp variable.

ii) We can swap two numbers without using third variable.