Introduction

In this blog post, we will explore how to solve the LeetCode problem "1813" using AI. LeetCode is a popular platform for preparing for coding interviews, and with the help of AI tools like Chatmagic, we can generate solutions quickly and efficiently - helping you pass the interviews and get the job offer without having to study for months.

Problem Statement

You are given two strings sentence1 and sentence2, each representing a sentence composed of words. A sentence is a list of words that are separated by a single space with no leading or trailing spaces. Each word consists of only uppercase and lowercase English characters. Two sentences s1 and s2 are considered similar if it is possible to insert an arbitrary sentence (possibly empty) inside one of these sentences such that the two sentences become equal. Note that the inserted sentence must be separated from existing words by spaces. For example, s1 = "Hello Jane" and s2 = "Hello my name is Jane" can be made equal by inserting "my name is" between "Hello" and "Jane" in s1. s1 = "Frog cool" and s2 = "Frogs are cool" are not similar, since although there is a sentence "s are" inserted into s1, it is not separated from "Frog" by a space. Given two sentences sentence1 and sentence2, return true if sentence1 and sentence2 are similar. Otherwise, return false. Example 1: Input: sentence1 = "My name is Haley", sentence2 = "My Haley" Output: true Explanation: sentence2 can be turned to sentence1 by inserting "name is" between "My" and "Haley". Example 2: Input: sentence1 = "of", sentence2 = "A lot of words" Output: false Explanation: No single sentence can be inserted inside one of the sentences to make it equal to the other. Example 3: Input: sentence1 = "Eating right now", sentence2 = "Eating" Output: true Explanation: sentence2 can be turned to sentence1 by inserting "right now" at the end of the sentence. Constraints: 1 <= sentence1.length, sentence2.length <= 100 sentence1 and sentence2 consist of lowercase and uppercase English letters and spaces. The words in sentence1 and sentence2 are separated by a single space.

Explanation

Here's a breakdown of the solution:

• Find Common Prefix and Suffix: The core idea is to identify the longest common prefix and suffix between the two sentences. The dissimilar part lies in the middle.

• Similarity Check: If one sentence can be transformed into the other by inserting a sub-sentence, after removing the common prefix and suffix the remaining part of the shorter sentence must be empty.

• Time Complexity: O(m + n), where m and n are the lengths of the sentences.

• Space Complexity: O(m + n), due to splitting the sentences into lists of words.

Code

    def areSentencesSimilar(sentence1: str, sentence2: str) -> bool:
    """
    Given two sentences sentence1 and sentence2, each representing a sentence composed of words.
    A sentence is a list of words that are separated by a single space with no leading or trailing spaces.
    Each word consists of only uppercase and lowercase English characters.
    Two sentences s1 and s2 are considered similar if it is possible to insert an arbitrary sentence (possibly empty) inside one of these sentences such that the two sentences become equal.
    Note that the inserted sentence must be separated from existing words by spaces.
    For example,
    s1 = "Hello Jane" and s2 = "Hello my name is Jane" can be made equal by inserting "my name is" between "Hello" and "Jane" in s1.
    s1 = "Frog cool" and s2 = "Frogs are cool" are not similar, since although there is a sentence "s are" inserted into s1, it is not separated from "Frog" by a space.

    Given two sentences sentence1 and sentence2, return true if sentence1 and sentence2 are similar. Otherwise, return false.

    Example 1:
    Input: sentence1 = "My name is Haley", sentence2 = "My Haley"
    Output: true
    Explanation: sentence2 can be turned to sentence1 by inserting "name is" between "My" and "Haley".

    Example 2:
    Input: sentence1 = "of", sentence2 = "A lot of words"
    Output: false
    Explanation: No single sentence can be inserted inside one of the sentences to make it equal to the other.

    Example 3:
    Input: sentence1 = "Eating right now", sentence2 = "Eating"
    Output: true
    Explanation: sentence2 can be turned to sentence1 by inserting "right now" at the end of the sentence.

    Constraints:
    1 <= sentence1.length, sentence2.length <= 100
    sentence1 and sentence2 consist of lowercase and uppercase English letters and spaces.
    The words in sentence1 and sentence2 are separated by a single space.
    """

    words1 = sentence1.split()
    words2 = sentence2.split()

    i, j = 0, 0
    while i < len(words1) and j < len(words2) and words1[i] == words2[j]:
        i += 1
        j += 1

    k, l = len(words1) - 1, len(words2) - 1
    while k >= i and l >= j and words1[k] == words2[l]:
        k -= 1
        l -= 1

    return i > k or j > l