题解 | #求1+2+3+...+n#

static int count = 0;

class sum 
{
public:
    sum()
    {
        _count += _i;
        ++_i;
    }

    static int Getcount()
    {
        return _count;
    }

private:
    static int _i;
    static int _count;
};

int sum::_i = 1;
int sum::_count = 0;

class Solution {
public:
    int Sum_Solution(int n) 
    {
        sum arr[n];
        return sum::Getcount();
    }
};