题解 | 牛牛学数列4
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
import java.util.Scanner;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int a = in.nextInt();
int sum =0;
for (int i = 0; i <= a ; i++) {
for(int j = 0 ; j<=i; j++){
sum += j;
}
}System.out.print(sum);
}
}
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