【LeetCode 67_字符串_算术运算】Add Binary
1 string addBinary(string a, string b) 2 { 3 int alen = a.size(); 4 int blen = b.size(); 5 if (alen == 0) 6 return b; 7 else if (blen == 0) 8 return a; 9 10 int i = alen - 1; 11 int j = blen - 1; 12 int carry = 0; 13 string res; 14 while (i >= 0 || j >= 0 || carry > 0) { 15 if (i >= 0) 16 carry += a[i--] - '0'; 17 if (j >= 0) 18 carry += b[j--] - '0'; 19 res = (char)(carry % 2 + '0') + res; //res不用逆序处理了 20 carry = carry / 2; 21 } 22 return res; 23 }
