Problem Set - HFOJ

	ID	Problem Show tags Hide tags	AC / Tried	Difficulty
	9776	P1829B Blank Space implementation	0 / 0	(None)
	9775	P1829C Mr bitmasks greedy implementation	0 / 0	(None)
	9772	P1829D Gold Rush brute force dfs and similar dp implementation	0 / 0	(None)
	9771	P1829E The Lakes dfs and similar dsu graphs implementation	0 / 0	(None)
	9770	P1829F Forever Winter dfs and similar graphs math	0 / 0	(None)
	9769	P1829G Hits Different data structures dp implementation math	0 / 0	(None)
	9767	P1829H Don't Blame Me bitmasks combinatorics dp math	0 / 0	(None)
	9847	P1830A Copil Copac Draws Trees dfs and similar dp graphs trees	0 / 0	(None)
	9846	P1830B The BOSS Can Count Pairs brute force math	0 / 0	(None)
	9845	P1830C Hyperregular Bracket Strings combinatorics hashing math number theory sortings	0 / 0	(None)
	9844	P1830D Mex Tree brute force dp trees	0 / 0	(None)
	9843	P1830E Bully Sort data structures	0 / 0	(None)
	9842	P1830F The Third Grace data structures dp	0 / 0	(None)
	9841	P1831A Twin Permutations constructive algorithms	0 / 0	(None)
	9840	P1831B Array merging constructive algorithms greedy	0 / 0	(None)
	9814	P1832A New Palindrome strings *800	0 / 0	3
	9813	P1832B Maximum Sum brute force sortings two pointers *1100	0 / 0	3
	9811	P1832C Contrast Value greedy implementation *1200	0 / 0	4
	9809	P1832D1 Red-Blue Operations (Easy Version) binary search greedy implementation math *2100	0 / 0	7
	9808	P1832D2 Red-Blue Operations (Hard Version) binary search constructive algorithms greedy implementation math *2400	0 / 0	9
	9805	P1832E Combinatorics Problem brute force combinatorics dp *2200	0 / 0	8
	9804	P1832F Zombies binary search dp *3200	0 / 0	10
	9839	P1833A Musical Puzzle implementation strings *800	0 / 0	3
	9838	P1833B Restore the Weather greedy sortings *900	0 / 0	3
	9837	P1833C Vlad Building Beautiful Array greedy math *800	0 / 0	3
	9836	P1833D Flipper brute force constructive algorithms greedy *1400	0 / 0	4
	9835	P1833E Round Dance dfs and similar dsu graphs shortest paths *1600	0 / 0	5
	9834	P1833F Ira and Flamenco combinatorics constructive algorithms data structures implementation math sortings two pointers *1700	0 / 0	5
	9833	P1833G Ksyusha and Chinchilla constructive algorithms dfs and similar dp dsu greedy implementation trees *1800	0 / 0	6
	9941	P1834E MEX of LCM binary search data structures implementation math number theory *2300	0 / 0	8
	9940	P1834F Typewriter brute force math *2500	0 / 0	9
	9939	P1835A k-th equality brute force implementation math *1700	0 / 0	5
	9938	P1835B Lottery binary search brute force greedy math two pointers *2500	0 / 0	9
	9937	P1835C Twin Clusters bitmasks brute force constructive algorithms math probabilities *2600	0 / 0	10
	9936	P1835D Doctor's Brown Hypothesis dfs and similar graphs math number theory *2900	0 / 0	10
	9935	P1835E Old Mobile combinatorics dp probabilities *3500	0 / 0	10
	9934	P1835F Good Graph bitmasks dfs and similar graph matchings graphs implementation *3500	0 / 0	10
	9933	P1836A Destroyer implementation sortings *800	0 / 0	3
	9932	P1836B Astrophysicists greedy math *1100	0 / 0	3
	9832	P1837A Grasshopper on a Line constructive algorithms math	0 / 0	(None)
	9831	P1837B Comparison String greedy	0 / 0	(None)
	9830	P1837C Best Binary String constructive algorithms greedy	0 / 0	(None)
	9829	P1837D Bracket Coloring constructive algorithms greedy	0 / 0	(None)
	9828	P1837E Playoff Fixing combinatorics trees	0 / 0	(None)
	9826	P1837F Editorial for Two binary search data structures greedy implementation	0 / 0	(None)
	9872	P1838A Blackboard List constructive algorithms math *800	0 / 0	3
	9871	P1838B Minimize Permutation Subarrays constructive algorithms math *1100	0 / 0	3
	9870	P1838C No Prime Differences constructive algorithms math number theory *1400	0 / 0	4
	9869	P1838D Bracket Walk data structures greedy strings *2100	0 / 0	7
	9868	P1838E Count Supersequences combinatorics dp math *2500	0 / 0	9
	9867	P1838F Stuck Conveyor binary search constructive algorithms interactive *3000	0 / 0	10
	9866	P1839A The Good Array greedy implementation math *800	0 / 0	3
	9865	P1839B Lamps greedy sortings *1100	0 / 0	3
	9864	P1839C Insert Zero and Invert Prefix constructive algorithms *1300	0 / 0	4
	9863	P1839D Ball Sorting data structures dp sortings *2100	0 / 0	7
	9862	P1839E Decreasing Game constructive algorithms dfs and similar dp greedy interactive *2400	0 / 0	9
	9861	P1840A Cipher Shifer implementation strings two pointers *800	0 / 0	3
	9860	P1840B Binary Cafe bitmasks combinatorics math *1100	0 / 0	3
	9859	P1840C Ski Resort combinatorics math two pointers *1000	0 / 0	3
	9858	P1840D Wooden Toy Festival binary search greedy sortings *1400	0 / 0	4
	9857	P1840E Character Blocking data structures hashing implementation *1600	0 / 0	5
	9856	P1840F Railguns brute force dfs and similar dp graphs *2200	0 / 0	8
	9855	P1840G1 In Search of Truth (Easy Version) constructive algorithms interactive math meet-in-the-middle probabilities *2200	0 / 0	8
	9854	P1840G2 In Search of Truth (Hard Version) constructive algorithms interactive math meet-in-the-middle probabilities *2500	0 / 0	9
	9853	P1841A Game with Board constructive algorithms games	1 / 10	10
	9852	P1841B Keep it Beautiful implementation	0 / 5	10
	9851	P1841C Ranom Numbers brute force dp greedy math strings	0 / 8	10
	9850	P1841D Pairs of Segments data structures dp greedy sortings two pointers	0 / 1	10
	9849	P1841E Fill the Matrix binary search data structures greedy math string suffix structures	0 / 0	(None)
	9848	P1841F Monocarp and a Strategic Game dp geometry sortings two pointers	0 / 0	(None)
	9931	P1842A Tenzing and Tsondu games math *800	0 / 0	3
	9930	P1842B Tenzing and Books bitmasks greedy math *1100	0 / 0	3
	9929	P1842C Tenzing and Balls dp *1500	0 / 0	5
	9928	P1842D Tenzing and His Animal Friends constructive algorithms graphs greedy *1900	0 / 0	6
	9927	P1842E Tenzing and Triangle data structures dp geometry greedy math *2300	0 / 0	8
	9926	P1842F Tenzing and Tree dfs and similar greedy shortest paths sortings trees *2500	0 / 0	9
	9925	P1842G Tenzing and Random Operations combinatorics dp math probabilities *2800	0 / 0	10
	9924	P1842H Tenzing and Random Real Numbers bitmasks dp graphs math probabilities *3000	0 / 0	10
	9923	P1842I Tenzing and Necklace divide and conquer dp greedy *3500	0 / 0	10
	9922	P1843A Sasha and Array Coloring greedy sortings two pointers *800	0 / 0	3
	9921	P1843B Long Long greedy math two pointers *800	0 / 0	3
	9920	P1843C Sum in Binary Tree bitmasks combinatorics math trees *800	0 / 0	3
	9919	P1843D Apple Tree combinatorics dfs and similar dp math trees *1200	0 / 0	4
	9918	P1843E Tracking Segments binary search brute force data structures two pointers *1600	0 / 0	5
	9917	P1843F1 Omsk Metro (simple version) data structures dfs and similar dp graphs greedy math trees *1800	0 / 0	6
	9916	P1843F2 Omsk Metro (hard version) data structures dfs and similar divide and conquer dp math trees *2300	0 / 0	8
	9915	P1844A Subtraction Game constructive algorithms games *800	0 / 0	3
	9914	P1844B Permutations & Primes constructive algorithms math *1000	0 / 0	3
	9913	P1844C Particles dp greedy implementation math *1300	0 / 0	4
	9912	P1844D Row Major constructive algorithms greedy math number theory strings *1400	0 / 0	4
	9911	P1844E Great Grids 2-sat constructive algorithms dfs and similar dsu graphs *2400	0 / 0	9
	9910	P1844F1 Min Cost Permutation (Easy Version) brute force constructive algorithms greedy math *2600	0 / 0	10
	9909	P1844F2 Min Cost Permutation (Hard Version) binary search constructive algorithms data structures greedy math sortings *2800	0 / 0	10
	9908	P1844G Tree Weights bitmasks constructive algorithms data structures dfs and similar implementation math matrices number theory trees *3000	0 / 0	10
	9907	P1844H Multiple of Three Cycles combinatorics data structures dp dsu math *3400	0 / 0	10
	9906	P1845A Forbidden Integer constructive algorithms implementation math number theory *800	0 / 0	3
	9905	P1845B Come Together geometry implementation math *900	0 / 0	3
	9904	P1845C Strong Password binary search dp greedy strings *1400	0 / 0	4
	9903	P1845D Rating System binary search brute force data structures dp dsu greedy math two pointers *1800	0 / 0	6
	9902	P1845E Boxes and Balls dp implementation math *2500	0 / 0	9

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