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/******************************************************************************
Online C++ Compiler.
Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.
*******************************************************************************/
#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int main()
{
int a, b;
cin >> a >> b;
if (a > b)
{
int temp;
temp = a;
a = b;
b = temp;
}
string binaryA = bitset<32>(a).to_string();
string binaryB = bitset<32>(b).to_string();
binaryB.erase(0, binaryB.find_first_not_of('0'));
binaryA = binaryA.substr(binaryA.length() - binaryB.length(), binaryA.length());
;
int tempB = bitset<32>(binaryB).to_ulong();
int MSB = 0;
int iterator = 0;
while (tempB > 0)
{
if (tempB & 1)
{
MSB = iterator;
}
iterator++;
tempB = tempB >> 1;
}
if (a == b)
{
cout << 0 << endl;
}
else
{
for (int i = 0; i < binaryB.length(); i++)
{
if (binaryA.at(i) == binaryB.at(i))
{
if (binaryB[i] == '0')
{
cout << (binaryB.at(i));
binaryA[i] = '1';
}
else
{
binaryB[i] = '0';
}
}
}
}
binaryA[0] = '0';
binaryB[0] = '0';
int a1 = (int)bitset<32>(binaryA).to_ulong();
a1 = int(a1);
int b1 = (int)bitset<32>(binaryB).to_ulong();
int ans = (a1 ^ b1);
string ANS = to_string(ans);
ans = stoi(ANS);
// cout << ANS << endl;
// ANS.erase(0,ANS.find_first_not_of('0'));
cout << ans - 0;
return 0;
}
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