Question

下列数列是这样排列的 1 3 2 4 5 6 10 9 8 7 11 12 13 14 15 .问2013在第几排第几列

Answer 1

1 1

2 3 2

4 5 6 3

7 8 9 10 4

11 12 13 14 15 5

.

n n+1 .k

n=k(k-1)/2+1;;

2013>=k(k-1)/2+1; k=63 63*62/2+1=1954,2013-1954+1=60

63行60