LeetCode 2023: Number of Pairs of Strings With Concatenation Equal to Target Solution

Master LeetCode problem 2023 (Number of Pairs of Strings With Concatenation Equal to Target), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2023. Number of Pairs of Strings With Concatenation Equal to Target

Medium

Array Hash Table String Counting

Problem Explanation

Explanation

To solve this problem, we can iterate through all pairs of indices in the nums array and check if the concatenation of the two strings at those indices equals the target string. We can achieve this by using two nested loops to iterate through all possible pairs of indices.

Algorithm:

Initialize a variable count to keep track of the number of valid pairs.
Iterate through all pairs of indices (i, j) in the nums array where i != j.
Concatenate the strings at indices i and j.
If the concatenated string equals the target, increment the count.
Return the final count.

Time Complexity: O(n^2) where n is the length of the nums array.
Space Complexity: O(1)

Solution Code

class Solution {
    public int numOfPairs(String[] nums, String target) {
        int count = 0;
        for (int i = 0; i < nums.length; i++) {
            for (int j = 0; j < nums.length; j++) {
                if (i != j) {
                    String concat = nums[i] + nums[j];
                    if (concat.equals(target)) {
                        count++;
                    }
                }
            }
        }
        return count;
    }
}

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