Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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combinatorics

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Problems

#	Name
960E	Alternating Tree combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees	2300	x2267
954H	Path Counting combinatorics, dp	2500	x762
946F	Fibonacci String Subsequences combinatorics, dp, matrices	2400	x645
938E	Max History combinatorics, math	2300	x1543
933D	A Creative Cutout brute force, combinatorics, math	2900	x389
932E	Team Work combinatorics, dp, math	2400	x3431
929C	Красивая команда *special problem, combinatorics, math	1700	x1203
920G	List Of Integers binary search, bitmasks, brute force, combinatorics, math, number theory	2200	x1996
917C	Pollywog combinatorics, dp, matrices	2900	x450
914H	Ember and Storm's Tree Game combinatorics, dp, games, trees	3400	x277
914C	Travelling Salesman and Special Numbers brute force, combinatorics, dp	1800	x4209
908E	New Year and Entity Enumeration bitmasks, combinatorics, dp, math	2500	x837
900D	Unusual Sequences bitmasks, combinatorics, dp, math, number theory	2000	x3788
896D	Nephren Runs a Cinema chinese remainder theorem, combinatorics, math, number theory	2900	x616
895D	String Mark combinatorics, math, strings	2100	x1237
895C	Square Subsets bitmasks, combinatorics, dp, math	2000	x7340
894B	Ralph And His Magic Field combinatorics, constructive algorithms, math, number theory	1800	x4699
893E	Counting Arrays combinatorics, dp, math, number theory	2000	x4201
891E	Lust combinatorics, math, matrices	3000	x1116
888D	Almost Identity Permutations combinatorics, dp, math	1600	x10492
886E	Maximum Element combinatorics, dp, math	2400	x1212
878E	Numbers on the blackboard combinatorics, dp	3300	x737
875D	High Cry binary search, bitmasks, combinatorics, data structures, divide and conquer	2200	x2492
869C	The Intriguing Obsession combinatorics, dp, math	1800	x5202
865G	Flowers and Chocolate combinatorics, math, matrices	3300	x164
859E	Desk Disorder combinatorics, dfs and similar, dsu, graphs, trees	2100	x2113
856C	Eleventh Birthday combinatorics, dp, math	2400	x731
852F	Product transformation combinatorics, math, number theory	2200	x653
848E	Days of Floral Colours combinatorics, divide and conquer, dp, fft, math	3400	x242
848D	Shake It! combinatorics, dp, flows, graphs	2900	x456
844B	Rectangles combinatorics, math	1300	x9043
840C	On the Bench combinatorics, dp	2500	x2069
840A	Leha and Function combinatorics, greedy, math, number theory, sortings	1300	x7467
839D	Winter is here combinatorics, dp, math, number theory	2200	x3552
837F	Prefix Sums binary search, brute force, combinatorics, math, matrices	2400	x1080
833C	Ever-Hungry Krakozyabra brute force, combinatorics, greedy, math	2700	x507
830D	Singer House combinatorics, dp, graphs, trees	2800	x980
817B	Makes And The Product combinatorics, implementation, math, sortings	1500	x6423
815D	Karen and Cards binary search, combinatorics, data structures, geometry	2800	x751
815B	Karen and Test brute force, combinatorics, constructive algorithms, math	2200	x1601
814E	An unavoidable detour for home combinatorics, dp, graphs, shortest paths	2600	x725
809C	Find a car combinatorics, divide and conquer, dp	2600	x908
804F	Fake bullions combinatorics, dfs and similar, dp, graphs, number theory	3400	x215
804B	Minimum number of steps combinatorics, greedy, implementation, math	1400	x10159
803F	Coprime Subsequences bitmasks, combinatorics, number theory	2000	x4631
794G	Replace All combinatorics, dp, math	3400	x403
788B	Weird journey combinatorics, constructive algorithms, dfs and similar, dsu, graphs	2100	x2887
785D	Anton and School - 2 combinatorics, dp, math, number theory	2300	x3675
776G	Sherlock and the Encrypted Data bitmasks, combinatorics, dp	2900	x368
773F	Test Data Generation combinatorics, divide and conquer, dp, fft, math, number theory	3400	x218
768F	Barrels and boxes brute force, combinatorics, math, number theory, probabilities	2300	x1129
762F	Tree nesting combinatorics, graphs, trees	2800	x478
757E	Bash Plays with Functions brute force, combinatorics, dp, number theory	2500	x1546
756E	Byteland coins combinatorics, dp, math	3200	x205
756D	Bacterial Melee brute force, combinatorics, dp, string suffix structures	2400	x1084
755G	PolandBall and Many Other Balls combinatorics, divide and conquer, dp, fft, math, number theory	3200	x1024
750G	New Year and Binary Tree Paths bitmasks, brute force, combinatorics, dp	3200	x525
747F	Igor and Interesting Numbers brute force, combinatorics, dp, math	2500	x482
735C	Tennis Championship combinatorics, constructive algorithms, greedy, math	1600	x7965
724F	Uniformly Branched Trees combinatorics, dp, trees	2700	x522
722E	Research Rover combinatorics, dp	2900	x1083
717A	Festival Organization combinatorics, math, number theory	2900	x433
715E	Complete the Permutations combinatorics, fft, graphs, math	3400	x454
712D	Memory and Scores combinatorics, dp, math	2200	x1993
711D	Directed Roads combinatorics, dfs and similar, graphs, math	1900	x4968
698F	Coprime Permutation combinatorics, number theory	3000	x490
696C	PLEASE combinatorics, dp, implementation, math, matrices	2000	x2217
690D2	The Wall (medium) combinatorics	1800	x1461
689E	Mike and Geometry Problem combinatorics, data structures, dp, geometry, implementation	2000	x2130
689C	Mike and Chocolate Thieves binary search, combinatorics, math	1700	x6174
685A	Robbers' watch brute force, combinatorics, dp, math	1700	x4501
677C	Vanya and Label bitmasks, combinatorics, implementation, strings	1500	x6950
666C	Codeword combinatorics, strings	2500	x912
660E	Different Subsets For All Tuples combinatorics, math	2300	x1957
659G	Fence Divercity combinatorics, dp, number theory	2300	x1317
653G	Move by Prime combinatorics, math, number theory	3100	x643
652C	Foe Pairs combinatorics, sortings, two pointers	1800	x3755
645F	Cowslip Collections combinatorics, math, number theory	2500	x970
630I	Parking Lot combinatorics, math	1700	x8257
630H	Benches combinatorics, math	1400	x5662
630G	Challenge Pennants combinatorics, math	1600	x3300
630F	Selection of Personnel combinatorics, math	1300	x8044
630C	Lucky Numbers combinatorics, math	1100	x26900
629E	Famil Door and Roads combinatorics, data structures, dfs and similar, dp, probabilities, trees	2300	x1149
629A	Far Relative’s Birthday Cake brute force, combinatorics, constructive algorithms, implementation	800	x14845
626D	Jerry's Protest brute force, combinatorics, dp, probabilities	1800	x3157
623E	Transforming Sequence combinatorics, dp, fft, math	3300	x614
621C	Wet Shark and Flowers combinatorics, math, number theory, probabilities	1700	x6235
621B	Wet Shark and Bishops combinatorics, implementation	1300	x11612
617B	Chocolate combinatorics	1300	x20007
612E	Square Root of Permutation combinatorics, constructive algorithms, dfs and similar, graphs, math	2200	x2005
610A	Pasha and Stick combinatorics, math	1000	x27546
608B	Hamming Distance Sum combinatorics, strings	1500	x7459
603B	Moodular Arithmetic combinatorics, dfs and similar, dsu, math, number theory	1800	x2710
596C	Wilbur and Points combinatorics, greedy, sortings	1700	x2335
585E	Present for Vitalik the Philatelist combinatorics, math, number theory	2900	x1221
584B	Kolya and Tanya combinatorics	1500	x13657
577B	Modulo Sum combinatorics, data structures, dp, two pointers	1900	x14839
575H	Bots combinatorics, dp, math, number theory	1800	x1877
571A	Lengthening Sticks combinatorics, implementation, math	2100	x2680

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