摘要:
Discription Heidi is terrified by your estimate and she found it unrealistic that her friends would collaborate to drive her into debt. She expects th 阅读全文
摘要:
Discription A string t is called nice if a string "2017" occurs in t as a subsequence but a string "2016" doesn't occur in t as a subsequence. For exa 阅读全文
摘要:
Discription Richard just finished building his new house. Now the only thing the house misses is a cute little wooden fence. He had no idea how to mak 阅读全文
摘要:
Discription Levko has an array that consists of integers: a1, a2, ... , an. But he doesn’t like this array at all. Levko thinks that the beauty of the 阅读全文