math - Problem Set - HFOJ

	ID	Problem Show tags Hide tags	AC / Tried	Difficulty
	10617	P1967E1 Again Counting Arrays (Easy Version) combinatorics dp fft math *3100	0 / 0	10
	10616	P1967E2 Again Counting Arrays (Hard Version) combinatorics dp math *3500	0 / 0	10
	10614	P1968A Maximize? brute force math number theory *800	0 / 0	3
	10611	P1968D Permutation Game brute force dfs and similar games graphs greedy math *1300	0 / 0	4
	10607	P1968G2 Division + LCP (hard version) binary search brute force data structures dp hashing math string suffix structures strings *2200	0 / 0	8
	10606	P1969A Two Friends constructive algorithms implementation math *800	0 / 0	3
	10603	P1969D Shop Game data structures greedy math sortings *1900	0 / 0	6
	10575	P1971E Find the Car binary search math sortings *1500	0 / 0	5
	10574	P1971F Circle Perimeter binary search brute force dfs and similar geometry implementation math *1600	0 / 0	5
	10569	P1973A Chess For Three brute force dp implementation math *900	0 / 0	3
	10568	P1973B Cat, Fox and the Lonely Array binary search bitmasks data structures greedy math two pointers *1300	0 / 0	4
	10567	P1973C Cat, Fox and Double Maximum constructive algorithms greedy implementation math sortings *1700	0 / 0	5
	10566	P1973D Cat, Fox and Maximum Array Split brute force interactive math *2400	0 / 0	9
	10565	P1973E Cat, Fox and Swaps graphs math sortings *2500	0 / 0	9
	10563	P1974A Phone Desktop greedy math *800	0 / 0	3
	10555	P1975B 378QAQ and Mocha's Array brute force greedy math sortings *1000	0 / 0	3
	10551	P1975F Set bitmasks brute force combinatorics dfs and similar divide and conquer dp math *2600	0 / 0	10
	10550	P1975G Zimpha Fan Club fft greedy math strings *3000	0 / 1	10
	10543	P1976E Splittable Permutations combinatorics data structures dfs and similar greedy math trees	0 / 0	(None)
	10541	P1977A Little Nikita math *800	0 / 0	3
	10540	P1977B Binary Colouring bitmasks constructive algorithms greedy math *1100	0 / 0	3
	10539	P1977C Nikita and LCM brute force data structures dp greedy math number theory sortings *1900	0 / 0	6
	10697	P1978B New Bakery binary search greedy math ternary search *800	0 / 0	3
	10696	P1978C Manhattan Permutations constructive algorithms data structures greedy implementation math *1300	0 / 0	4
	10695	P1978D Elections data structures greedy implementation math *1600	0 / 0	5
	10686	P1980A Problem Generator math *800	0 / 0	3
	10683	P1980D GCD-sequence greedy implementation math number theory *1400	0 / 0	4
	10682	P1980E Permutation of Rows and Columns constructive algorithms data structures greedy hashing implementation math matrices sortings *1600	0 / 0	5
	10681	P1980F1 Field Division (easy version) data structures math sortings *1900	0 / 0	6
	10680	P1980F2 Field Division (hard version) math sortings *2400	0 / 0	9
	10536	P1981A Turtle and Piggy Are Playing a Game brute force greedy math	0 / 0	(None)
	10535	P1981B Turtle and an Infinite Sequence bitmasks math	0 / 0	(None)
	10534	P1981C Turtle and an Incomplete Sequence constructive algorithms implementation math	0 / 0	(None)
	10533	P1981D Turtle and Multiplication constructive algorithms dfs and similar graphs math number theory	0 / 0	(None)
	10532	P1981E Turtle and Intersected Segments data structures dsu graphs greedy math	0 / 0	(None)
	10678	P1982A Soccer greedy implementation math sortings *800	0 / 0	3
	10677	P1982B Collatz Conjecture brute force implementation math number theory *1200	0 / 0	4
	10675	P1982D Beauty of the mountains brute force data structures implementation math number theory *1700	0 / 0	5
	10674	P1982E Number of k-good subarrays bitmasks brute force combinatorics divide and conquer dp math meet-in-the-middle *2300	0 / 0	8
	10671	P1984B Large Addition implementation math *1100	0 / 0	3
	10670	P1984C1 Magnitude (Easy Version) dp greedy math *1300	0 / 0	4
	10669	P1984C2 Magnitude (Hard Version) combinatorics dp greedy math *1700	0 / 0	5
	10668	P1984D "a" String Problem brute force hashing implementation math string suffix structures strings *2000	0 / 0	7
	10666	P1984F Reconstruction brute force dp math *2500	0 / 0	9
	10662	P1985B Maximum Multiple Sum brute force math number theory *800	0 / 0	3
	10660	P1985D Manhattan Circle implementation math *900	0 / 0	3
	10659	P1985E Secret Box brute force combinatorics math *1200	0 / 0	4
	10657	P1985G D-Function combinatorics math number theory *1600	0 / 0	5
	10654	P1986A X Axis brute force geometry math sortings *800	0 / 0	3
	10651	P1986D Mathematical Problem brute force dp greedy implementation math two pointers *1400	0 / 0	4
	10650	P1986E Beautiful Array greedy math number theory sortings *1700	0 / 0	5
	10648	P1986G1 Permutation Problem (Simple Version) binary search brute force combinatorics data structures math number theory *2200	0 / 0	8
	10647	P1986G2 Permutation Problem (Hard Version) brute force data structures hashing math number theory *2500	0 / 0	9
	10646	P1987A Upload More RAM greedy math *800	0 / 0	3
	10755	P1988A Split the Multiset brute force greedy implementation math *900	0 / 0	3
	10750	P1988F Heartbeat combinatorics dp fft math *3000	0 / 0	10
	10634	P1989C Two Movies greedy math *1400	0 / 0	4
	10633	P1989D Smithing Skill brute force data structures dp greedy math sortings two pointers *1900	0 / 0	6
	10632	P1989E Distance to Different combinatorics dp math *2300	0 / 0	8
	10747	P1990C Mad MAD Sum brute force greedy math *1500	0 / 0	5
	10740	P1991C Absolute Zero constructive algorithms greedy math	0 / 0	(None)
	10739	P1991D Prime XOR Coloring bitmasks constructive algorithms graphs greedy math number theory	0 / 0	(None)
	10737	P1991F Triangle Formation brute force greedy math sortings	0 / 0	(None)
	10735	P1991H Prime Split Game bitmasks fft games math number theory	0 / 0	(None)
	10733	P1992A Only Pluses brute force constructive algorithms greedy math sortings *800	0 / 0	3
	10732	P1992B Angry Monk greedy math sortings *800	0 / 0	3
	10731	P1992C Gorilla and Permutation constructive algorithms math *900	0 / 0	3
	10729	P1992E Novice's Mistake brute force constructive algorithms implementation math strings *1700	0 / 0	5
	10727	P1992G Ultra-Meow combinatorics dp math *2000	0 / 0	7
	10725	P1994B Fun Game bitmasks constructive algorithms greedy math *1100	0 / 0	3
	10723	P1994D Funny Game constructive algorithms dsu graphs greedy math number theory trees *1900	0 / 0	6
	10722	P1994E Wooden Game bitmasks greedy math trees *2000	0 / 0	7
	10720	P1994G Minecraft bitmasks brute force dp graphs math *2600	0 / 0	10
	10719	P1994H Fortnite combinatorics constructive algorithms games greedy hashing interactive math number theory strings *3500	0 / 0	10
	10718	P1995A Diagonals brute force greedy implementation math *800	0 / 0	3
	10716	P1995B2 Bouquet (Hard Version) binary search data structures greedy math sortings two pointers *1700	0 / 0	5
	10715	P1995C Squaring brute force constructive algorithms greedy implementation math number theory *1800	0 / 0	6
	10711	P1996A Legs binary search math ternary search	0 / 0	(None)
	10708	P1996D Fun binary search brute force combinatorics math number theory	0 / 0	(None)
	10707	P1996E Decode combinatorics implementation math	0 / 0	(None)
	10706	P1996F Bomb binary search greedy math	0 / 0	(None)
	10699	P1997F Chips on a Line dp math	0 / 0	(None)

Pick a problem randomly based on the current filter.