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AddBinary.cpp
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AddBinary.cpp
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// Source: https://leetcode.com/problems/add-binary/
// 2015/5/17
// My Solution
class Solution {
public:
string addBinary(string a, string b) {
if (a.size() == 0 || b.size() == 0)
return a.size() == 0 ? b : a;
string sum_str(a.size() > b.size() ? a.size() + 1 : b.size() + 1, '0');
int carry = 0, index = sum_str.size() - 1;
int i = a.size()-1, j = b.size() - 1;
for (; i >= 0 && j >= 0; --i, --j) {
int sum = a[i] - '0' + b[j] - '0' + carry;
sum_str[index--] = sum % 2 + '0';
carry = sum / 2;
}
while (i >= 0) {
int sum = a[i] - '0' + carry;
sum_str[index--] = sum % 2 + '0';
carry = sum / 2;
--i;
}
while (j >= 0) {
int sum = b[j] - '0' + carry;
sum_str[index--] = sum % 2 + '0';
carry = sum / 2;
--j;
}
sum_str[index] = carry + '0';
return carry ? sum_str : sum_str.substr(1, sum_str.size() - 1);
}
}; // 4ms