#include <iostream>
#include <vector>
#include <string>
using namespace std;
int solution(int n, int k) {
// PLEASE DO NOT MODIFY THE FUNCTION SIGNATURE
// write code here
return k * ((n + 1)*n /2);
}
int main() {
std::cout << (solution(3, 1) == 6) << std::endl;
std::cout << (solution(2, 2) == 6) << std::endl;
std::cout << (solution(4, 3) == 30) << std::endl;
}
本题很简单不做赘述