题目

Code:

#include <iostream>
#define int long long
using namespace std;
namespace solve {
	bool check(int n) {
		if (n % 4 == 0 && n % 100 != 0 || n % 400 == 0) return true;
		else return false;
	}
	void f() {
		int l, r;
		cin >> l >> r;
		int sum = 0;
		for (int i = l; i <= r; ++i) {
			if (check(i)) sum += i;
		}
		cout << sum;
	}
}
using namespace solve;
signed main() {
	f();
}

好了请@我