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Logic-1 > sumLimit
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Given 2 non-negative ints, a and b, return their sum, so long as the sum has the same number of digits as a. If the sum has more digits than a, just return a without b. (Note: one way to compute the number of digits of a non-negative int n is to convert it to a string with String.valueOf(n) and then check the length of the string.)

sumLimit(2, 3) → 5
sumLimit(8, 3) → 8
sumLimit(8, 1) → 9

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public int sumLimit(int a, int b) { }

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