题解 | #求 1 - n 之间偶数的和#
求 1 - n 之间偶数的和
http://www.nowcoder.com/practice/03df7fa0950046a9ba564b4438f918a3
#include using namespace std;
int main() {
int n;
cin >> n;
int sum = 0;
// write your code here......
n-=n%2;//偶数不变，奇数减一
while(n>0){
sum+=n;
n-=2;
}
cout << sum << endl;
return 0;
}
