题解 | 牛牛学数列
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
int sum = 0;
for (int i = 1;i <= n; ++i) { // 注意 while 处理多个 case
if(i % 2 == 1){
sum += i;
}else{
sum -= i;
}
}
cout << sum << endl;
return 0;
}
// 64 位输出请用 printf("%lld")
