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
1326C	Permutation Partitions combinatorics, greedy, math	1300	x16395
1312D	Count the Arrays combinatorics, math	1700	x10522
1307E	Cow and Treats binary search, combinatorics, dp, greedy, implementation, math	2500	x1363
1305C	Kuroni and Impossible Calculation brute force, combinatorics, math, number theory	1600	x18765
1301C	Ayoub's function binary search, combinatorics, greedy, math, strings	1700	x9874
1299D	Around the World bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees	3000	x528
1295F	Good Contest combinatorics, dp, probabilities	2700	x1507
1293B	JOE is on TV! combinatorics, greedy, math	1000	x22293
1292F	Nora's Toy Boxes bitmasks, combinatorics, dp	3500	x370
1292C	Xenon's Attack on the Gangs combinatorics, dfs and similar, dp, greedy, trees	2300	x2252
1288C	Two Arrays combinatorics, dp	1600	x15262
1285F	Classical? binary search, combinatorics, number theory	2900	x1345
1284E	New Year and Castle Construction combinatorics, geometry, math, sortings	2500	x1379
1284C	New Year and Permutation combinatorics, math	1600	x8735
1284B	New Year and Ascent Sequence binary search, combinatorics, data structures, dp, implementation, sortings	1400	x11454
1280F	Intergalactic Sliding Puzzle combinatorics, constructive algorithms, math	3400	x107
1279E	New Year Permutations combinatorics, dp	2700	x455
1279D	Santa's Bot combinatorics, math, probabilities	1700	x7289
1278F	Cards combinatorics, dp, math, number theory, probabilities	2600	x2494
1276C	Beautiful Rectangle brute force, combinatorics, constructive algorithms, data structures, greedy, math	2300	x1788
1276B	Two Fairs combinatorics, dfs and similar, dsu, graphs	1900	x5668
1272C	Yet Another Broken Keyboard combinatorics, dp, implementation	1200	x30717
1271E	Common Number binary search, combinatorics, dp, math	2100	x3712
1267K	Key Storage combinatorics, math	2100	x2142
1264D2	Beautiful Bracket Sequence (hard version) combinatorics, probabilities	2900	x1315
1264D1	Beautiful Bracket Sequence (easy version) combinatorics, dp, probabilities	2600	x1525
1254E	Send Tree to Charlie combinatorics, dfs and similar, dsu, trees	3300	x366
1251F	Red-White Fence combinatorics, fft	2500	x976
1245F	Daniel and Spring Cleaning bitmasks, brute force, combinatorics, dp	2300	x2263
1239A	Ivan the Fool and the Probability Theory combinatorics, dp, math	1700	x7790
1238D	AB-string binary search, combinatorics, dp, strings	1900	x6442
1237F	Balanced Domino Placements combinatorics, dp	2600	x1092
1236B	Alice and the List of Presents combinatorics, math	1500	x12051
1228E	Another Filling the Grid combinatorics, dp, math	2300	x3450
1227F2	Wrong Answer on test 233 (Hard Version) combinatorics, math	2400	x1919
1221G	Graph And Numbers bitmasks, brute force, combinatorics, dp, meet-in-the-middle	2900	x876
1215B	The Number of Products combinatorics, dp, implementation	1400	x18326
1207D	Number Of Permutations combinatorics	1800	x6698
1205E	Expected Value Again combinatorics, strings	3100	x373
1204E	Natasha, Sasha and the Prefix Sums combinatorics, dp, math, number theory	2300	x2069
1202D	Print a 1337-string... combinatorics, constructive algorithms, math, strings	1900	x5462
1197E	Culture Code binary search, combinatorics, data structures, dp, shortest paths, sortings	2300	x1851
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x4898
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x8197
1194F	Crossword Expert combinatorics, dp, number theory, probabilities, two pointers	2400	x1219
1188E	Problem from Red Panda combinatorics	3300	x288
1185G2	Playlist for Polycarp (hard version) combinatorics, dp	2600	x919
1185G1	Playlist for Polycarp (easy version) bitmasks, combinatorics, dp	2100	x3197
1181C	Flag brute force, combinatorics, dp, implementation	1900	x3403
1178F1	Short Colorful Strip combinatorics, dfs and similar, dp	2200	x2285
1178C	Tiles combinatorics, greedy, math	1300	x13220
1174E	Ehab and the Expected GCD Problem combinatorics, dp, math, number theory	2500	x1774
1172B	Nauuo and Circle combinatorics, dfs and similar, dp, trees	1900	x4404
1167F	Scalar Queries combinatorics, data structures, math, sortings	2300	x1889
1167E	Range Deleting binary search, combinatorics, data structures, two pointers	2100	x2924
1166A	Silent Classroom combinatorics, greedy	900	x15075
1153F	Serval and Bonus Problem combinatorics, dp, math, probabilities	2600	x929
1151F	Sonya and Informatics combinatorics, dp, matrices, probabilities	2300	x1457
1151E	Number of Components combinatorics, data structures, dp, math	2100	x3769
1140E	Palindrome-less Arrays combinatorics, divide and conquer, dp	2200	x2112
1118F2	Tree Cutting (Hard Version) combinatorics, dfs and similar, dp, trees	2700	x632
1111D	Destroy the Colony combinatorics, dp, math	2600	x1154
1109D	Sasha and Interesting Fact from Graph Theory brute force, combinatorics, dp, math, trees	2400	x1501
1105C	Ayoub and Lost Array combinatorics, dp, math	1500	x11364
1102E	Monotonic Renumeration combinatorics, sortings	1700	x6902
1097G	Vladislav and a Great Legend combinatorics, dp, trees	3000	x1053
1097F	Alex and a TV Show bitmasks, combinatorics, number theory	2500	x1472
1096E	The Top Scorer combinatorics, dp, math, probabilities	2500	x1278
1096B	Substring Removal combinatorics, math, strings	1300	x11679
1091D	New Year and the Permutation Concatenation combinatorics, dp, math	1700	x7473
1089I	Interval-Free Permutations combinatorics	2600	x459
1085G	Beautiful Matrix combinatorics, data structures, dp	2900	x709
1084C	The Fair Nut and String combinatorics, dp, implementation	1500	x11642
1081C	Colorful Bricks combinatorics, dp, math	1500	x8557
1073E	Segment Sum bitmasks, combinatorics, dp, math	2300	x3566
1065E	Side Transmutations combinatorics, strings	2300	x1287
1060F	Shrinking Tree combinatorics, dp	2900	x787
1043F	Make It One bitmasks, combinatorics, dp, math, number theory, shortest paths	2500	x2992
1043D	Mysterious Crime brute force, combinatorics, math, meet-in-the-middle, two pointers	1700	x4760
1037F	Maximum Reduction combinatorics, data structures, math	2500	x1272
1036F	Relatively Prime Powers combinatorics, math, number theory	2400	x1858
1036C	Classy Numbers combinatorics, dp	1900	x13350
1034C	Region Separation combinatorics, dp, number theory, trees	2700	x993
1028D	Order book combinatorics, data structures, greedy	2100	x1822
1027E	Inverse Coloring combinatorics, dp, math	2100	x2362
1009E	Intercity Travelling combinatorics, math, probabilities	2000	x3361
1007B	Pave the Parallelepiped bitmasks, brute force, combinatorics, math, number theory	2400	x1037
1007A	Reorder the Array combinatorics, data structures, math, sortings, two pointers	1300	x13064
1000D	Yet Another Problem On a Subsequence combinatorics, dp	1900	x5038
997D	Cycles in product combinatorics, divide and conquer, trees	2900	x517
997C	Sky Full of Stars combinatorics, math	2500	x2176
997B	Roman Digits brute force, combinatorics, dp, greedy, math	2000	x3136
995F	Cowmpany Cowmpensation combinatorics, dp, math, trees	2700	x1624
991E	Bus Number brute force, combinatorics, math	1800	x3727
986B	Petr and Permutations combinatorics, math	1800	x5054
985G	Team Players combinatorics	2700	x719
981H	K Paths combinatorics, data structures, dp, fft, math	3100	x288
978E	Bus Video System combinatorics, math	1400	x10589
961G	Partitions combinatorics, math, number theory	2700	x1610
960G	Bandit Blues combinatorics, dp, fft, math	2900	x1201

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