Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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Problems

#	Name
1641E	Special Positions combinatorics, divide and conquer, fft, math	3300	x290
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1503
1641C	Anonymity Is Important binary search, brute force, data structures, dsu, greedy, sortings	2200	x2842
1641B	Repetitions Decoding constructive algorithms, implementation, sortings	2000	x4064
1641A	Great Sequence brute force, greedy, sortings	1200	x18979
1639K	Treasure Hunt graphs, interactive
1639J	Treasure Hunt graphs, interactive
1639I	Treasure Hunt graphs, interactive
1639H	Treasure Hunt graphs, interactive
1639G	Treasure Hunt graphs, interactive
1639F	Treasure Hunt graphs, interactive
1639E	Treasure Hunt graphs, interactive
1639D	Treasure Hunt graphs, interactive
1639C	Treasure Hunt graphs, interactive
1639B	Treasure Hunt graphs, interactive
1639A	Treasure Hunt graphs, interactive
1638F	Two Posters brute force, data structures, greedy, two pointers	3200	x261
1638E	Colorful Operations brute force, data structures, implementation	2400	x2364
1638D	Big Brush constructive algorithms, data structures, greedy, implementation	2000	x4730
1638C	Inversion Graph data structures, dsu, graphs, math	1300	x15936
1638B	Odd Swap Sort data structures, math, sortings	1100	x22541
1638A	Reverse constructive algorithms, greedy, math	800	x22145
1637H	Minimize Inversions Number data structures, greedy, math, sortings	3500	x571
1637G	Birthday constructive algorithms, greedy, math	3000	x620
1637F	Towers constructive algorithms, dfs and similar, dp, greedy, trees	2500	x2160
1637E	Best Pair binary search, brute force, implementation	2100	x3795
1637D	Yet Another Minimization Problem dp, greedy, math	1800	x8913
1637C	Andrew and Stones greedy, implementation	1200	x18743
1637B	MEX and Array brute force, dp, greedy, math	1100	x15456
1637A	Sorting Parts brute force, sortings	800	x24133
1635F	Closest Pair data structures, greedy	2800	x1391
1635E	Cars 2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings	2200	x2723
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x7046
1635C	Differential Sorting constructive algorithms, greedy	1200	x25090
1635B	Avoid Local Maximums greedy	800	x18458
1635A	Min Or Sum bitmasks, greedy	800	x25881
1634F	Fibonacci Additions brute force, data structures, hashing, implementation, math	2700	x1900
1634E	Fair Share constructive algorithms, data structures, dfs and similar, graph matchings, graphs	2400	x2177
1634D	Finding Zero constructive algorithms, interactive, math	2000	x4736
1634C	OKEA constructive algorithms	1000	x19083
1634B	Fortune Telling bitmasks, math	1400	x22266
1634A	Reverse and Concatenate greedy, strings	800	x24652
1633F	Perfect Matching data structures, divide and conquer, interactive, trees	2800	x369
1633E	Spanning Tree Queries binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees	2400	x1742
1633D	Make Them Equal dp, greedy	1600	x18666
1633C	Kill the Monster brute force, math	1100	x21249
1633B	Minority greedy	800	x29393
1633A	Div. 7 brute force	800	x36005
1632E2	Distance Tree (hard version) binary search, dfs and similar, shortest paths, trees	2700	x1196
1632E1	Distance Tree (easy version) binary search, data structures, dfs and similar, graphs, shortest paths, trees	2400	x1338
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x5329
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x14067
1632B	Roof Construction bitmasks, constructive algorithms	1000	x31490
1632A	ABC implementation	800	x31064
1631B	Fun with Even Subarrays dp, greedy	1100	x26863
1631A	Min Max Swap greedy	800	x31300
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x919
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x554
1630D	Flipping Range constructive algorithms, dp, greedy, number theory	2400	x1978
1630C	Paint the Middle dp, greedy, sortings, two pointers	2200	x3324
1630B	Range and Partition binary search, constructive algorithms, data structures, greedy, two pointers	1800	x6484
1630A	And Matching bitmasks, constructive algorithms	1500	x16142
1629B	GCD Arrays greedy, math, number theory	800	x25277
1629A	Download More RAM brute force, greedy, sortings	800	x30922
1628F	Spaceship Crisis Management binary search, data structures, geometry, sortings	3500	x97
1628E	Groceries in Meteor Town binary search, data structures, dsu, trees	3100	x1214
1628D2	Game on Sum (Hard Version) combinatorics, dp, games, math	2400	x2630
1628D1	Game on Sum (Easy Version) combinatorics, dp, games, math	2100	x3698
1628C	Grid Xor constructive algorithms, greedy, implementation, interactive, math	2300	x3576
1628B	Peculiar Movie Preferences greedy, strings	1700	x12706
1628A	Meximum Array binary search, constructive algorithms, greedy, implementation, math, two pointers	1400	x16978
1627F	Not Splitting geometry, graphs, greedy, implementation, shortest paths	2700	x654
1627E	Not Escaping data structures, dp, implementation, shortest paths, two pointers	2200	x2787
1627D	Not Adding brute force, dp, math, number theory	1900	x9364
1627C	Not Assigning constructive algorithms, dfs and similar, number theory, trees	1400	x16238
1627B	Not Sitting games, greedy, sortings	1300	x17562
1627A	Not Shading constructive algorithms, implementation	800	x24895
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x904
1626E	Black and White Tree dfs and similar, greedy, trees	2400	x1855
1626D	Martial Arts Tournament binary search, brute force, greedy, math	2100	x4329
1626C	Monsters And Spells binary search, data structures, dp, greedy, implementation, math, two pointers	1700	x11802
1626B	Minor Reduction greedy, strings	1100	x23930
1626A	Equidistant Letters constructive algorithms, sortings	800	x30871
1625E2	Cats on the Upgrade (hard version) binary search, data structures, dfs and similar, graphs, trees	2800	x660
1625E1	Cats on the Upgrade (easy version) brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees	2500	x1148
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x2318
1625C	Road Optimization dp	1700	x13276
1625B	Elementary Particles brute force, greedy, sortings	1100	x16857
1625A	Ancient Civilization bitmasks, greedy, math	800	x18283
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x7589
1624F	Interacdive Problem binary search, constructive algorithms, interactive	2000	x3800
1624E	Masha-forgetful brute force, constructive algorithms, dp, hashing, implementation, strings	2000	x4590
1624D	Palindromes Coloring binary search, greedy, sortings, strings	1400	x19072
1624C	Division by Two and Permutation constructive algorithms, flows, graph matchings, greedy, math	1100	x26827
1624B	Make AP implementation, math	900	x52875
1624A	Plus One on the Subset math	800	x60213
1623E	Middle Duplication data structures, dfs and similar, greedy, strings, trees	2500	x1260
1623D	Robot Cleaner Revisit implementation, math, probabilities	2300	x1469
1623C	Balanced Stone Heaps binary search, greedy	1600	x14308
1623B	Game on Ranges brute force, dfs and similar, implementation, sortings	1100	x14660

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