Problem Set - HFOJ

	ID	Problem Show tags Hide tags	AC / Tried	Difficulty
	104	P1808E1 Minibuses on Venus (easy version) combinatorics divide and conquer dp *2200	0 / 0	8
	102	P1808E2 Minibuses on Venus (medium version) combinatorics divide and conquer dp matrices *2500	0 / 0	9
	100	P1808E3 Minibuses on Venus (hard version) brute force combinatorics dp math *2800	0 / 0	10
	98	P1809A Garland implementation *800	1 / 1	3
	96	P1809B Points on Plane binary search greedy math *1000	0 / 0	3
	94	P1809C Sum on Subarrays constructive algorithms greedy math *1500	0 / 0	5
	92	P1809D Binary String Sorting constructive algorithms greedy *1800	0 / 0	6
	90	P1809E Two Tanks binary search dp implementation math *2400	0 / 0	9
	86	P1809F Traveling in Berland binary search data structures graphs greedy implementation *2500	0 / 0	9
	87	P1809G Prediction combinatorics dp math *2800	0 / 0	10
	82	P1810A Beautiful Sequence brute force greedy *800	0 / 0	3
	83	P1810B Candies constructive algorithms math number theory *800	0 / 0	3
	81	P1810C Make It Permutation brute force greedy sortings *1300	0 / 0	4
	78	P1810D Climbing the Tree binary search math *1700	0 / 0	5
	77	P1810E Monsters brute force data structures dfs and similar dsu graphs greedy *2100	0 / 0	7
	75	P1810F M-tree data structures math sortings trees *2800	0 / 0	10
	71	P1810G The Maximum Prefix dp *3200	0 / 0	10
	70	P1810H Last Number combinatorics math *2900	0 / 0	10
	68	P1811A Insert Digit greedy math strings *800	0 / 0	3
	66	P1811B Conveyor Belts implementation math *1000	0 / 0	3
	65	P1811C Restore the Array constructive algorithms greedy *1100	0 / 0	3
	63	P1811D Umka and a Long Flight constructive algorithms implementation math *1600	0 / 0	5
	64	P1811E Living Sequence binary search dp math number theory *1500	0 / 0	5
	61	P1811F Is It Flower? dfs and similar graphs implementation *2100	0 / 0	7
	59	P1811G1 Vlad and the Nice Paths (easy version) combinatorics dp math *2100	0 / 0	7
	60	P1811G2 Vlad and the Nice Paths (hard version) binary search combinatorics data structures dp math two pointers *2200	0 / 0	8
	57	P1814A Coins implementation math *800	0 / 0	3
	55	P1814B Long Legs brute force math *1700	0 / 0	5
	54	P1814C Search in Parallel constructive algorithms greedy sortings *1500	0 / 0	5
	53	P1814D Balancing Weapons binary search brute force data structures math two pointers *2500	0 / 0	9
	51	P1814E Chain Chips data structures dp matrices *2300	0 / 0	8
	50	P1814F Communication Towers brute force divide and conquer dsu *2700	0 / 0	10
	49	P1815A Ian and Array Sorting greedy math *1300	0 / 0	4
	48	P1815B Sum Graph brute force constructive algorithms graphs implementation interactive shortest paths trees *2000	0 / 0	7
	45	P1815C Between constructive algorithms dfs and similar graphs greedy *2200	0 / 0	8
	43	P1815D XOR Counting bitmasks combinatorics dp math *2600	0 / 0	10
	42	P1815E Bosco and Particle dp math number theory strings *3100	0 / 0	10
	41	P1815F OH NO1 (-2-3-4) constructive algorithms graphs math *3500	0 / 0	10
	40	P1816A Ian Visits Mary constructive algorithms geometry number theory *800	0 / 0	3
	38	P1816B Grid Reconstruction constructive algorithms greedy *1000	0 / 0	3
	9802	P1817A Almost Increasing Subsequence binary search data structures greedy *1500	0 / 0	5
	9801	P1817B Fish Graph brute force constructive algorithms dfs and similar graphs *1900	0 / 0	6
	9800	P1817C Similar Polynomials combinatorics math *2400	0 / 0	9
	9799	P1817D Toy Machine constructive algorithms games implementation *2700	0 / 0	10
	9798	P1817E Half-sum brute force divide and conquer greedy *3400	0 / 0	10
	9797	P1817F Entangled Substrings string suffix structures strings *3500	0 / 0	10
	9796	P1818A Politics greedy implementation *800	0 / 0	3
	9795	P1818B Indivisible constructive algorithms *900	0 / 0	3
	36	P1819A Constructive Problem brute force greedy *1300	0 / 0	4
	35	P1819B The Butcher geometry greedy implementation sortings two pointers *1900	0 / 0	6
	33	P1819C The Fox and the Complete Tree Traversal constructive algorithms dp implementation math trees *2400	0 / 0	9
	32	P1819D Misha and Apples brute force data structures dp two pointers *2800	0 / 0	10
	31	P1819E Roads in E City interactive math probabilities trees *3200	0 / 0	10
	30	P1819F Willy-nilly, Crack, Into Release! data structures dp *3500	0 / 0	10
	28	P1820A Yura's New Name implementation strings *800	2 / 2	3
	26	P1820B JoJo's Incredible Adventures math strings two pointers *1100	2 / 3	3
	23	P1821A Matching combinatorics math	14 / 39	6
	22	P1821B Sort the Subarray brute force greedy	12 / 41	6
	19	P1821C Tear It Apart brute force implementation math strings	10 / 27	6
	17	P1821D Black Cells binary search brute force greedy math	3 / 23	9
	16	P1821E Rearrange Brackets brute force dp greedy sortings strings	1 / 1	10
	13	P1821F Timber combinatorics dp fft math	1 / 11	10
	12	P1822A TubeTube Feed brute force implementation sortings	0 / 0	(None)
	10	P1822B Karina and Array greedy math sortings	0 / 0	(None)
	8	P1822C Bun Lover math	0 / 0	(None)
	9	P1822D Super-Permutation constructive algorithms math	0 / 0	(None)
	5	P1822E Making Anti-Palindromes greedy math strings	0 / 0	(None)
	3	P1822F Gardening Friends brute force dfs and similar dp graphs implementation trees	0 / 0	(None)
	2	P1822G1 Magic Triples (Easy Version) brute force math number theory	0 / 0	(None)
	1	P1822G2 Magic Triples (Hard Version) binary search brute force divide and conquer math number theory	0 / 0	(None)
	3641	P1823A A-characteristic constructive algorithms math	0 / 0	(None)
	3639	P1823B Sort with Step math sortings	0 / 0	(None)
	3636	P1823C Strongly Composite greedy math number theory	0 / 0	(None)
	3635	P1823D Unique Palindromes constructive algorithms strings	0 / 0	(None)
	3632	P1823E Removing Graph games graphs	0 / 0	(None)
	3630	P1823F Random Walk graphs math probabilities	0 / 0	(None)
	9794	P1824A LuoTianyi and the Show greedy implementation	0 / 0	(None)
	9793	P1824B1 LuoTianyi and the Floating Islands (Easy Version) combinatorics dp math probabilities trees	0 / 0	(None)
	9792	P1824B2 LuoTianyi and the Floating Islands (Hard Version) combinatorics dp math probabilities trees	0 / 0	(None)
	9791	P1824C LuoTianyi and XOR-Tree bitmasks data structures dfs and similar dp dsu greedy trees	0 / 0	(None)
	9790	P1824D LuoTianyi and the Function data structures	0 / 0	(None)
	9789	P1824E LuoTianyi and Cartridge data structures trees	0 / 0	(None)
	9788	P1825A LuoTianyi and the Palindrome String brute force greedy implementation strings	1 / 1	10
	9787	P1825B LuoTianyi and the Table brute force greedy implementation math	0 / 1	10
	9786	P1826A Trust Nobody brute force greedy implementation sortings	0 / 0	(None)
	9785	P1826B Lunatic Never Content math number theory	0 / 0	(None)
	9784	P1826C Dreaming of Freedom greedy math number theory	0 / 0	(None)
	9783	P1826D Running Miles brute force dp greedy	0 / 0	(None)
	9782	P1826E Walk the Runway bitmasks brute force data structures dp graphs implementation sortings	0 / 0	(None)
	9780	P1826F Fading into Fog geometry interactive math probabilities	0 / 0	(None)
	9823	P1827A Counting Orders combinatorics math sortings two pointers *1100	0 / 0	3
	9822	P1827B1 Range Sorting (Easy Version) binary search dp dsu greedy trees two pointers *2000	0 / 0	7
	9821	P1827B2 Range Sorting (Hard Version) binary search data structures dp greedy *2400	0 / 0	9
	9820	P1827C Palindrome Partition binary search brute force data structures dp hashing strings *2600	0 / 0	10
	9819	P1827D Two Centroids data structures dfs and similar greedy trees *2800	0 / 0	10
	9818	P1827E Bus Routes binary search constructive algorithms dfs and similar greedy trees *3400	0 / 0	10
	9817	P1827F Copium Permutation constructive algorithms data structures greedy *3500	0 / 0	10
	9816	P1828A Divisible Array constructive algorithms math *800	0 / 0	3
	9815	P1828B Permutation Swap math number theory *900	0 / 0	3
	9778	P1829A Love Story implementation strings	0 / 0	(None)

Pick a problem randomly based on the current filter.