暑假训练-个人赛第五场

		ID	Origin	Title
	0 / 23	Problem A	SGU 453	Meetings
		Problem B	SGU 454	Kakuro
	10 / 58	Problem C	SGU 455	Sequence analysis
	14 / 52	Problem D	SGU 456	Annuity Payment Scheme
		Problem E	SGU 457	Snow in Berland
	0 / 1	Problem F	SGU 458	The Monochrome Picture
		Problem G	SGU 459	Choreographer Problem
	20 / 46	Problem H	SGU 460	Plural Form of Nouns
	3 / 4	Problem I	SGU 461	Wiki Lists
	1 / 8	Problem J	SGU 462	Electrician
	14 / 38	Problem K	SGU 463	Walking around Berhattan

这场难度适中吧，C题有点傻，比赛的时候没做出来。

A

　　a, b 两人相距L，a速度为v1, b速度为v2，相向而行，到达端点时返回，问在t时间内相遇多少次。

B