[leetcode] p338 Count Bits
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class Solution {public: vector<int> countBits(int num) { vector<int> result; for (int i=0; i<num+1; i++) { if (i==0) { result.push_back(0); } else { result.push_back(result.at(i >> 1) + (i & 1)); } } return result; }};
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