LeetCode OJ 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) { reverse(a.begin(), a.end()); reverse(b.begin(), b.end()); if (a.size() < b.size()) swap(a, b); b.append(a.size() - b.size(), '0'); string ans(a.size() + 2, '0'); for (int i = 0; i < a.size(); i++) { ans[i + 1] += ((ans[i] - '0') + (a[i] - '0') + (b[i] - '0')) / 2; ans[i] = ((ans[i] - '0') + (a[i] - '0') + (b[i] - '0')) % 2 + '0'; } int i; for (i = ans.size() - 1; i > 0 && ans[i] == '0'; i--); ans = ans.substr(0, i + 1); reverse(ans.begin(), ans.end()); return ans; }}; 0 0
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