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

// Example 1:

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

// Output: "134"

// Example 2:

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

// Output: "533"

// Tag - Easy

class Solution {

public String addStrings(String num1, String num2) {

String big = num1.length() >= num2.length() ? num1 : num2;

String small = num1.length() < num2.length() ? num1 : num2;

StringBuilder sb = new StringBuilder();

int sum = 0;

for (int i = 0; i < big.length(); i++) {

int b = big.charAt(big.length() - i - 1) - '0';

int s = i < small.length() ? (small.charAt(small.length() - i - 1) - '0') : 0;

sum += b + s;

sb.append(sum % 10);

sum /= 10;

}

if (sum > 0) sb.append(sum);

return sb.reverse().toString();

}

}