题解 | #牛牛学数列4#
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
public class Program {
public static void Main() {
int result = 0;
int inPut = int.Parse(System.Console.ReadLine());
//等差数列求和
for (int i = 1; i <= inPut; i++) {
result += i * (1 + i) / 2;
}
System.Console.WriteLine(result);
}
}
