package codewars;
import java.math.BigInteger;
public class Finance{
public static BigInteger finance(int n){
BigInteger sum = new BigInteger("0");
int head = 0;
for(int i = 0; i <= n; i++){
for(int j = head; j <= head + n - i; j++){
sum = sum.add(new BigInteger(String.valueOf(j)));
}
head += 2;
}
return sum;
}
}
转载于:https://my.oschina.net/u/553266/blog/811898