Number of Pairs of Strings With Concatenation Equal to Target solution leetcode

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Given an array of digit strings nums
and a digit string target
, return the number of pairs of indices (i, j)
(where i != j
) such that the concatenation of nums[i] + nums[j]
equals target
. Number of Pairs of Strings With Concatenation Equal to Target solution leetcode
Number of Pairs of Strings With Concatenation Equal to Target solution leetcode
Input: nums = ["777","7","77","77"], target = "7777" Output: 4 Explanation: Valid pairs are:  (0, 1): "777" + "7"  (1, 0): "7" + "777"  (2, 3): "77" + "77"  (3, 2): "77" + "77"
Number of Pairs of Strings With Concatenation Equal to Target solution leetcode
Input: nums = ["123","4","12","34"], target = "1234" Output: 2 Explanation: Valid pairs are:  (0, 1): "123" + "4"  (2, 3): "12" + "34"
Example 3:
Input: nums = ["1","1","1"], target = "11" Output: 6 Explanation: Valid pairs are:  (0, 1): "1" + "1"  (1, 0): "1" + "1"  (0, 2): "1" + "1"  (2, 0): "1" + "1"  (1, 2): "1" + "1"  (2, 1): "1" + "1"
Number of Pairs of Strings With Concatenation Equal to Target solution leetcode
2 <= nums.length <= 100
1 <= nums[i].length <= 100
2 <= target.length <= 100
nums[i]
andtarget
consist of digits.nums[i]
andtarget
do not have leading zeros.
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