67. Add Binary
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Given two binary strings, return their sum (also a binary string).
For example,
a = "11"
b = "1"
Return "100".
class Solution {public: string addBinary(string a, string b) { string ret = ""; int i = a.length() - 1; int j = b.length() - 1; int curSum = 0; //从右往左（低位往高位）逐位相加。 while(i >= 0 || j>=0 || curSum == 1) { //如果当前的索引大于等于零，则将当前为的数字加上，否则加上0 curSum += i>=0?a[i--]-'0':0; curSum += j>=0?b[j--]-'0':0; //将当前为的结果mod2之后加入结果字符串中 ret = (char)(curSum %2 + '0') +ret; //进位 curSum /=2; } return ret; }};1
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