How should I practice Add Two Numeric Strings with Carry?

Start by reading the full statement, solve the visible examples, then compare the pattern against related ZipRecruiter onsite interview problems in FastPrep.

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Add Two Numeric Strings with Carry

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Problem statement

You are given two strings, a and b, representing nonnegative decimal integers. Return their decimal sum as a string.

Perform digit-by-digit addition with carry; the inputs may be too large for fixed-width numeric types.

Function

addNumericStrings(a: String, b: String) → String

Examples

Example 1

a = "999"b = "1"return = "1000"

Adding the final digits produces a carry through all three nines.

Example 2

a = "123"b = "789"return = "912"

Right-to-left addition gives units 2, tens 1, and hundreds 9.

Constraints

1 <= a.length,b.length <= 10000
Both inputs contain only decimal digits.
Neither input has a leading zero unless it equals "0".