简洁
#include<iostream> using namespace std; int main() { int n; int sum = 0; cin >> n; for (int i = 1; i <= n; i++) { if (i % 2 == 0) sum -= i; else sum += i; } cout << sum << endl; return 0; }
#include<iostream> using namespace std; int main() { int n; int sum = 0; cin >> n; for (int i = 1; i <= n; i++) { if (i % 2 == 0) sum -= i; else sum += i; } cout << sum << endl; return 0; }
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