题解 | #求1+2+3+...+n#
求1+2+3+...+n
https://www.nowcoder.com/practice/7a0da8fc483247ff8800059e12d7caf1
class A
{
public:
A()
{
_sum+=_i;
_i++;
}
static int GetSum()
{
return _sum;
}
private:
static int _i;
static int _sum;
};
int A::_i=1;
int A::_sum=0;
class Solution {
public:
int Sum_Solution(int n) {
A a[n];
return A::GetSum();
}
};
