Package g0401_0500.s0415_add_strings

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    415 - Add Strings\.

    Easy

    Given two non-negative integers, num1 and num2 represented as string, return the sum of num1 and num2 as a string.

    You must solve the problem without using any built-in library for handling large integers (such as BigInteger). You must also not convert the inputs to integers directly.

    Example 1:

    Input: num1 = "11", num2 = "123"

    Output: "134"

    Example 2:

    Input: num1 = "456", num2 = "77"

    Output: "533"

    Example 3:

    Input: num1 = "0", num2 = "0"

    Output: "0"

    Constraints:

    • <code>1 <= num1.length, num2.length <= 10<sup>4</sup></code>

    • num1 and num2 consist of only digits.

    • num1 and num2 don't have any leading zeros except for the zero itself.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final String addStrings(String num1, String num2)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait