combinatorics - Problem Set - 追梦算法网

	ID	Problem Show tags Hide tags	AC / Tried	Difficulty
	1875	P9D How many trees? combinatorics divide and conquer dp *1900	0 / 0	(None)
	1895	P15E Triangles combinatorics dp *2600	0 / 0	(None)
	1926	P26D Tickets combinatorics math probabilities *2400	0 / 0	(None)
	1932	P28C Bath Queue combinatorics dp probabilities *2200	0 / 0	(None)
	1976	P40E Number Table combinatorics *2500	0 / 0	(None)
	1990	P44I Toys brute force combinatorics *2300	0 / 0	(None)
	2019	P51E Pentagon combinatorics graphs matrices *2400	0 / 0	(None)
	2021	P52B Right Triangles combinatorics *1600	0 / 0	(None)
	2186	P111D Petya and Coloring combinatorics dp *2300	0 / 0	(None)
	2222	P124B Permutations brute force combinatorics implementation *1400	0 / 0	(None)
	2231	P128C Games with Rectangle combinatorics dp *2000	0 / 0	(None)
	2253	P135E Weak Subsequence combinatorics *3000	0 / 0	(None)
	2277	P145C Lucky Subsequence combinatorics dp math *2100	0 / 0	(None)
	2287	P150B Quantity of Strings combinatorics dfs and similar graphs math *1600	0 / 0	(None)
	2304	P156D Clues combinatorics graphs *2500	0 / 0	(None)
	2343	P171B Star special problem combinatorics 1300	0 / 0	(None)
	2360	P176C Playing with Superglue combinatorics constructive algorithms *2000	0 / 0	(None)
	2434	P201E Thoroughly Bureaucratic Organization binary search combinatorics *2600	0 / 0	(None)
	2503	P229C Triangles combinatorics graphs math *1900	0 / 0	(None)
	2504	P229E Gifts combinatorics dp math probabilities *2600	0 / 0	(None)

Pick a problem randomly based on the current filter.