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Add Binary Strings.cpp
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Add Binary Strings.cpp
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//{ Driver Code Starts
#include<bits/stdc++.h>
using namespace std;
// } Driver Code Ends
//User function template for C++
class Solution{
public:
string addBinary(string A, string B)
{
int carry=0;
string ans="";
int index1=A.length()-1;
int index2=B.length()-1;
while(index1>=0 && index2>=0){
if( A[index1]=='1' && B[index2]=='1'){
if(carry==1){
ans+="1";
carry=1;
}else{
ans+="0";
carry=1;
}
}else if(A[index1]=='1' && B[index2]=='0'){
if(carry==1){
ans+="0";
carry=1;
}else{
ans+="1";
carry=0;
}
}else if(A[index1]=='0' && B[index2]=='1'){
if(carry==1){
ans+="0";
carry=1;
}else{
ans+="1";
carry=0;
}
}else{
if(carry==1){
ans+="1";
carry=0;
}else{
ans+="0";
carry=0;
}
}
index1--;
index2--;
}
if(index1>=0){
while(index1>=0){
if(carry==1 && A[index1]=='1'){
ans+="0";
carry=1;
}else if(carry==0 && A[index1]=='1'){
ans+="1";
carry=0;
}
else if(carry==1 && A[index1]=='0'){
ans+="1";
carry=0;
}else{
ans+="0";
carry=0;
}
index1--;
}
}
if(index2>=0){
while(index2>=0){
if(carry==1 && B[index2]=='1'){
ans+="0";
carry=1;
}else if(carry==0 && B[index2]=='1'){
ans+="1";
carry=0;
}
else if(carry==1 && B[index2]=='0'){
ans+="1";
carry=0;
}else{
ans+="0";
carry=0;
}
index2--;
}
}
if(carry==1){
ans+="1";
}
reverse(ans.begin(),ans.end());
int i=0;
while(i<ans.length() && ans[i]=='0'){
i++;
}
return ans.substr(i);
}
};
//{ Driver Code Starts.
int main()
{
int t; cin >> t;
while (t--)
{
string A, B; cin >> A >> B;
Solution ob;
cout << ob.addBinary (A, B);
cout << "\n";
}
}
// Contributed By: Pranay Bansal
// } Driver Code Ends