class Solution { public: vector<int> plusOne(vector<int>& digits) { int n = digits.size(); for(int i = n-1; i >=0 ; --i) { if((digits[i] + 1) > 9) { digits[i] = 0; } else { digits[i] += 1; return digits; } } digits.push_back(0); digits[0] = 1; return digits; } };
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