摘要:
Time Limit: 10 Seconds Memory Limit: 32768 KB In 1949 the Indian mathematician D.R. Kaprekar discovered a class of numbers called self-numbers. For any positive integer n, define d(n) to be n pl... 阅读全文
摘要:
Time Limit: 2 Seconds Memory Limit: 65536 KB Starting from point (0,0) on a plane, we have written all non-negative integers 0, 1, 2,... as shown in the figure. For example, 1, 2, and 3 has be... 阅读全文