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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Problems

#	Name
1731B	Kill Demodogs greedy, math	1100	x26757
1731A	Joey Takes Money greedy, math	800	x23664
1730F	Almost Sorted bitmasks, data structures, dp	2700	x743
1730E	Maximums and Minimums combinatorics, data structures, divide and conquer, number theory	2700	x766
1730D	Prefixes and Suffixes constructive algorithms, strings, two pointers	2200	x3023
1730C	Minimum Notation data structures, greedy, math, sortings	1200	x17931
1730B	Meeting on the Line binary search, geometry, greedy, implementation, math, ternary search	1600	x17246
1730A	Planets data structures, greedy, sortings	800	x24811
1729G	Cut Substrings combinatorics, dp, hashing, strings, two pointers	2100	x2505
1729F	Kirei and the Linear Function hashing, math	1900	x4550
1729E	Guess the Cycle Size interactive, probabilities	1800	x7913
1729D	Friends and the Restaurant greedy, sortings, two pointers	1200	x30695
1729C	Jumping on Tiles constructive algorithms, strings	1100	x21639
1729B	Decode String greedy, strings	800	x32465
1729A	Two Elevators math	800	x45874
1728G	Illumination binary search, bitmasks, brute force, combinatorics, dp, math, two pointers	2700	x616
1728F	Fishermen flows, graph matchings, greedy	3100	x506
1728E	Red-Black Pepper brute force, data structures, greedy, math, number theory	2300	x2030
1728D	Letter Picking constructive algorithms, dp, games, two pointers	1800	x8239
1728C	Digital Logarithm data structures, greedy, sortings	1400	x17877
1728B	Best Permutation constructive algorithms, greedy	800	x20670
1728A	Colored Balls: Revisited brute force, greedy, implementation, sortings	800	x25446
1726H	Mainak and the Bleeding Polygon binary search, geometry, implementation, math	3500	x106
1726G	A Certain Magical Party combinatorics, data structures, greedy, sortings	3300	x365
1726E	Almost Perfect combinatorics, fft, math	2400	x1713
1726D	Edge Split brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees	2000	x4160
1726C	Jatayu's Balanced Bracket Sequence data structures, dsu, graphs, greedy	1300	x13398
1726B	Mainak and Interesting Sequence bitmasks, constructive algorithms, math	1100	x16835
1726A	Mainak and Array greedy, math	900	x36476
1725M	Moving Both Hands dp, graphs, shortest paths	1800	x4381
1725L	Lemper Cooking Competition data structures	2400	x1094
1725K	Kingdom of Criticism data structures, dsu	2500	x780
1725J	Journey dp, trees	2500	x464
1725I	Imitating the Key Tree combinatorics, dsu, trees	2800	x296
1725H	Hot Black Hot White constructive algorithms, math	1800	x3008
1725G	Garage binary search, geometry, math	1500	x6690
1725F	Field Photography bitmasks, data structures, sortings	2100	x1143
1725E	Electrical Efficiency combinatorics, data structures, dp, math, number theory, trees	2500	x598
1725D	Deducing Sortability binary search, bitmasks, math	2900	x232
1725C	Circular Mirror binary search, combinatorics, geometry, math, two pointers	2000	x1947
1725B	Basketball Together binary search, greedy, sortings	1000	x28206
1725A	Accumulation of Dominoes math	800	x10129
1722G	Even-Odd XOR bitmasks, constructive algorithms, greedy	1500	x14164
1722F	L-shapes dfs and similar, implementation	1700	x8005
1722E	Counting Rectangles brute force, data structures, dp, implementation	1600	x13344
1722D	Line greedy, sortings	1100	x26542
1722C	Word Game data structures, implementation	800	x36151
1722B	Colourblindness implementation	800	x56401
1722A	Spell Check implementation	800	x65543
1721F	Matching Reduction brute force, constructive algorithms, dfs and similar, flows, graph matchings, graphs, interactive	2800	x514
1721E	Prefix Function Queries dfs and similar, dp, hashing, string suffix structures, strings, trees	2200	x2550
1721D	Maximum AND bitmasks, dfs and similar, divide and conquer, greedy, sortings	1800	x7676
1721C	Min-Max Array Transformation binary search, greedy, two pointers	1400	x14556
1721B	Deadly Laser implementation	1000	x23876
1721A	Image greedy, implementation	800	x28306
1720E	Misha and Paintings constructive algorithms, data structures, greedy, implementation, math	2700	x950
1720D2	Xor-Subsequence (hard version) bitmasks, data structures, dp, strings, trees	2400	x2197
1720D1	Xor-Subsequence (easy version) bitmasks, brute force, dp, strings, trees, two pointers	1800	x6709
1720C	Corners greedy, implementation	1200	x18228
1720B	Interesting Sum brute force, data structures, greedy, math, sortings	800	x22412
1720A	Burenka Plays with Fractions math, number theory	900	x24358
1719C	Fighting Tournament binary search, data structures, implementation, two pointers	1400	x14362
1719B	Mathematical Circus constructive algorithms, math	800	x19166
1719A	Chip Game games, math	800	x26816
1718F	Burenka, an Array and Queries data structures, math, number theory	3300	x217
1718E	Impressionism constructive algorithms, graphs, implementation, math	3500	x176
1718D	Permutation for Burenka data structures, graph matchings, greedy, math, trees	3300	x418
1718C	Tonya and Burenka-179 data structures, greedy, math, number theory	2400	x1858
1718B	Fibonacci Strings greedy, implementation, math, number theory	2000	x3464
1718A2	Burenka and Traditions (hard version) data structures, dp, greedy	1900	x5909
1718A1	Burenka and Traditions (easy version) dp, greedy	1800	x6416
1717F	Madoka and The First Session constructive algorithms, flows, graph matchings, graphs, implementation	2500	x637
1717E	Madoka and The Best University math, number theory	2200	x3403
1717D	Madoka and The Corruption Scheme combinatorics, constructive algorithms, greedy, math	1900	x4860
1717C	Madoka and Formal Statement greedy	1300	x15897
1717B	Madoka and Underground Competitions constructive algorithms, implementation	1100	x15636
1717A	Madoka and Strange Thoughts math, number theory	800	x20956
1716F	Bags with Balls combinatorics, dp, math, number theory	2500	x1364
1716E	Swap and Maximum Block bitmasks, data structures, dfs and similar, divide and conquer, dp	2500	x1318
1716D	Chip Move brute force, dp, math	2000	x6136
1716C	Robot in a Hallway data structures, dp, greedy, implementation, ternary search	2000	x4591
1716B	Permutation Chain constructive algorithms, math	800	x21953
1716A	2-3 Moves greedy, math	800	x35833
1715F	Crop Squares constructive algorithms, geometry, interactive, math	2700	x588
1715E	Long Way Home data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths	2400	x2128
1715D	2+ doors 2-sat, bitmasks, graphs, greedy	1900	x6079
1715C	Monoblock combinatorics, data structures, implementation, math	1700	x10366
1715B	Beautiful Array constructive algorithms, greedy, math	1000	x33562
1715A	Crossmarket constructive algorithms, greedy, math	800	x24375
1714G	Path Prefixes binary search, data structures, dfs and similar, trees	1700	x9695
1714F	Build a Tree and That Is It constructive algorithms, implementation, trees	1900	x3659
1714E	Add Modulo 10 brute force, math, number theory	1400	x23507
1714D	Color with Occurrences brute force, data structures, dp, greedy, strings	1600	x10316
1714C	Minimum Varied Number greedy	800	x33424
1714B	Remove Prefix data structures, greedy, implementation	800	x33757
1714A	Everyone Loves to Sleep implementation, math	900	x32862
1713F	Lost Array bitmasks, combinatorics, constructive algorithms, dp, math	2900	x688
1713E	Cross Swapping 2-sat, data structures, dsu, greedy, matrices	2400	x1974
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x6227
1713C	Build Permutation constructive algorithms, dp, math	1200	x18868

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