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66-PlusOne.cc
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66-PlusOne.cc
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class Solution
{
public:
vector<int> plusOne(vector<int> &digits)
{
add(digits, 1);
return digits;
}
private:
void add(vector<int> &digits, int digit)
{
int carry = digit;
for (auto it = digits.rbegin(); it != digits.rend(); ++it)
{
*it += carry;
carry = *it / 10; // 有进位则为1,无进位则为0
*it %= 10;
}
if (carry > 0)
digits.insert(digits.begin(), 1);
}
};
// lambda Version
class Solution
{
public:
vector<int> plusOne(vector<int> &digits)
{
add(digits, 1);
return digits;
}
private:
void add(vector<int> &digits, int digit)
{
int carry = digit;
for_each(digits.rbegin(), digits.rend(), [&carry](int &d) {
d += carry;
carry = d / 10; // 有进位则为1,无进位则为0
d %= 10;
});
if (carry > 0)
digits.insert(digits.begin(), 1);
}
};