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Main.java
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Main.java
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package com.company;
public class Main {
public static void main(String[] args) {
// write your code here
}
public String addStrings(String num1, String num2) {
String res = "";
int p1 = num1.length() - 1, p2 = num2.length() - 1;
int car = 0, cur = 0;
while (p1 >= 0 && p2 >= 0) {
cur = (num1.charAt(p1) - '0' + num2.charAt(p2) - '0' + car) % 10;
car = (num1.charAt(p1--) - '0' + num2.charAt(p2--) - '0' + car) / 10;
res = cur + res;
}
while (p1 >= 0) {
cur = (num1.charAt(p1) - '0' + car) % 10;
car = (num1.charAt(p1--) - '0' + car) / 10;
res = cur + res;
}
while (p2 >= 0) {
cur = (num2.charAt(p2) - '0' + car) % 10;
car = (num2.charAt(p2--) - '0' + car) / 10;
res = cur + res;
}
if(car != 0) res = car + res;
return res;
}
}