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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