Package g0401_0500.s0415_add_strings

Class Solution

java.lang.Object
g0401_0500.s0415_add_strings.Solution
public class Solution extends java.lang.Object
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:

  • 1 <= num1.length, num2.length <= 104
  • num1 and num2 consist of only digits.
  • num1 and num2 don’t have any leading zeros except for the zero itself.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.lang.String
    addStrings(java.lang.String num1, java.lang.String num2)
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • addStrings

      public java.lang.String addStrings(java.lang.String num1, java.lang.String num2)