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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. string addBinary(string a, string b) {
  5.     int lenA = a.length(), lenB = b.length();
  6.     int i = lenA - 1, j = lenB - 1;
  7.     int carry = 0;
  8.     stack<char> out;
  9.     int sum = 0;
  10.     while(i >= 0 || j >= 0){
  11.         if(i >= 0 && j >= 0){
  12.             sum = a[i] - '0' + b[j] - '0' + carry;
  13.             i--;
  14.             j--;
  15.         }else{
  16.             if(i < 0){
  17.                 sum = b[j] - '0' + carry;
  18.                 j--;
  19.             }
  20.             else{
  21.                 sum = a[i] - '0' + carry;
  22.                 i--;
  23.             }
  24.         }
  25.         if(sum > 1){
  26.             carry = 1;
  27.         }else{
  28.             carry = 0;
  29.         }
  30.         sum = sum % 2;
  31.         char aChar = '0' + sum;
  32.         out.push(aChar);
  33.     }
  34.     if(carry){
  35.         out.push('1');
  36.     }
  37.     string res = "";
  38.     while(!out.empty()){
  39.         res = res + out.top();
  40.         out.pop();
  41.     }
  42.     return res;
  43. }
  44.  
  45.  
  46. int main() {
  47. 	cout << addBinary("11", "1");
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/o5r3Eq
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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