Check Palindrome Using a Loop

Easy ⏱ 8 min 74% acceptance ★★★★☆ 4.4

Write a function is_palindrome(s) that returns True if the string s reads the same forwards and backwards, checked with a loop that compares characters from both ends moving inward (do not use slicing to reverse the string).

Examples

Example 1

Input

is_palindrome("racecar")

Output

True

Explanation

Reads the same forward and backward.

Example 2

Input

is_palindrome("hello")

Output

False

Explanation

Not symmetric.

Constraints

s contains no spaces and comparison is case-sensitive.
Must not use s[::-1] or reversed().

Topics

Loopswhile loop

Companies

TCSWipro

Hints

Hint 1

Use two pointers, `left = 0` and `right = len(s) - 1`, moving toward the center.

Hint 2

Return False as soon as a mismatch is found.

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