X DAYS

:

HOUR

:

MINS

:

SEC

Copied to Clipboard
Infix to Postfix
Easy Accuracy: 51.65% Submissions: 15723 Points: 2

Given an infix expression in the form of string str. Convert this infix expression to postfix expression.

• Infix expression: The expression of the form a op b. When an operator is in-between every pair of operands.
• Postfix expression: The expression of the form a b op. When an operator is followed for every pair of operands.
â€‹Note: The order of precedence is: ^ greater than * equals to / greater than + equals to -.

Example 1:

Input: str = "a+b*(c^d-e)^(f+g*h)-i"
Output: abcd^e-fgh*+^*+i-
Explanation:
After converting the infix expression
into postfix expression, the resultant
expression will be abcd^e-fgh*+^*+i-

Example 2:

Input: str = "A*(B+C)/D"
Output: ABC+*D/
Explanation:
After converting the infix expression
into postfix expression, the resultant
expression will be ABC+*D/

This is a function problem. You only need to complete the function infixToPostfix() that takes a string(Infix Expression) as a parameter and returns a string(postfix expression). The printing is done automatically by the driver code.

Expected Time Complexity: O(|str|).
Expected Auxiliary Space: O(|str|).

Constraints:
1 ≤ |str| ≤ 105

We are replacing the old Disqus forum with the new Discussions section given below.

Editorial

We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?

My Submissions:  