leetcode/23/10/Q2652.h

//
// Created by 李洋 on 2023/10/17.
//

#ifndef LEECODE_C_Q2652_H
#define LEECODE_C_Q2652_H

class Q2652 {
public:
    int f(int n, int m) {
        return (m + n / m * m) * (n / m) / 2;
    }

    int sumOfMultiples(int n) {
        return f(n, 3) + f(n, 5) + f(n, 7) - f(n, 3 * 5) - f(n, 3 * 7) - f(n, 5 * 7) + f(n, 3 * 5 * 7);
    }
};

#endif //LEECODE_C_Q2652_H