3969. Valid Subarrays With Matching Sum Digits I

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You are given an integer array nums and an integer digit x. A subarray nums[l..r] is considered valid if the sum of its elements satisfies both of the following conditions: - The first digit of the sum is equal to x. - The last digit of the sum is equal to x. Return the number of valid subarrays. Example 1: Input: nums = [1,100,1], x = 1 Output: 4 Explanation: The valid subarrays are:

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solution.cppC++17

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