题解 | #求1+2+3+...+n#

这题目显然是在考察发散思维

class A {
private:
    static int N;
    static int sum;
public:
    A() {
        N++;
        sum = sum + N;
    }
    static void reset() {
        N = 0;
        sum = 0;
    }
    static int getSum() {
        return sum;
    }
};

int A::N = 0;
int A::sum = 0;

class Solution {
public:
    int Sum_Solution(int n) {
        int res;
        A::reset();
        A *a = new A[n];
        delete []a;  //防止内存泄漏
        a = NULL;    //防止指针悬空
        res = A::getSum();
        
        return res;
    }
};