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
1980F2	Field Division (hard version) math, sortings	2400	x1225
1980F1	Field Division (easy version) data structures, math, sortings	1900	x4388
1980E	Permutation of Rows and Columns constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings	1600	x12996
1980D	GCD-sequence greedy, implementation, math, number theory	1400	x17370
1980C	Sofia and the Lost Operations constructive algorithms, greedy	1300	x21697
1980B	Choosing Cubes sortings, sortings	800	x38492
1980A	Problem Generator math	800	x47576
1979F	Kostyanych's Theorem brute force, constructive algorithms, graphs, interactive	2900	x438
1979E	Manhattan Triangle binary search, constructive algorithms, data structures, geometry, implementation, two pointers	2400	x1808
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x7848
1979C	Earning on Bets binary search, combinatorics, constructive algorithms, number theory	1200	x22181
1979B	XOR Sequences bitmasks, greedy	1000	x26419
1979A	Guess the Maximum brute force, greedy, implementation	800	x31763
1978F	Large Graph data structures, dfs and similar, dsu, graphs, number theory, two pointers	2400	x1578
1978E	Computing Machine brute force, data structures, dp, greedy, implementation	2000	x4600
1978D	Elections data structures, greedy, implementation, math	1600	x13627
1978C	Manhattan Permutations constructive algorithms, data structures, greedy, implementation, math	1300	x17779
1978B	New Bakery binary search, greedy, math, ternary search	800	x25323
1978A	Alice and Books constructive algorithms, greedy, sortings	800	x28618
1977E	Tensor constructive algorithms, graphs, interactive	2600	x934
1977D	XORificator bitmasks, brute force, greedy, hashing	2300	x2345
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x8035
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x19893
1977A	Little Nikita math	800	x39179
1976F	Remove Bridges data structures, dfs and similar, dp, greedy, sortings, trees	2800	x832
1976E	Splittable Permutations combinatorics, data structures, dfs and similar, greedy, math, trees	2500	x1302
1976D	Invertible Bracket Sequences binary search, combinatorics, data structures, divide and conquer, implementation, two pointers	2000	x5796
1976C	Job Interview binary search, dp, greedy, implementation, two pointers	1600	x12413
1976B	Increase/Decrease/Copy greedy, implementation	1100	x25069
1976A	Verify Password implementation, sortings, strings	800	x32640
1975I	Mind Bloom dp	3500	x175
1975H	378QAQ and Core greedy, strings	3500	x216
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x342
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x1036
1975E	Chain Queries binary search, data structures, dfs and similar, implementation, trees	2100	x2870
1975D	Paint the Tree brute force, dfs and similar, dp, greedy, shortest paths, trees	1700	x7492
1975C	Chamo and Mocha's Array binary search, brute force, greedy	1200	x17158
1975B	378QAQ and Mocha's Array brute force, greedy, math, sortings	1000	x21063
1975A	Bazoka and Mocha's Array brute force, greedy, implementation, sortings	800	x20701
1974G	Money Buys Less Happiness Now data structures, greedy, sortings	2000	x5888
1974F	Cutting Game binary search, brute force, data structures, implementation, sortings, two pointers	1900	x4401
1974E	Money Buys Happiness dp	1800	x11302
1974D	Ingenuity-2 constructive algorithms, greedy, implementation	1400	x17783
1974C	Beautiful Triple Pairs combinatorics, data structures	1400	x19034
1974B	Symmetric Encoding implementation, sortings, strings	800	x34463
1974A	Phone Desktop greedy, math	800	x37891
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x320
1973E	Cat, Fox and Swaps graphs, math, sortings	2500	x992
1973D	Cat, Fox and Maximum Array Split brute force, interactive, math	2400	x2256
1973C	Cat, Fox and Double Maximum constructive algorithms, greedy, implementation, math, sortings	1700	x9844
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x16815
1973A	Chess For Three brute force, dp, implementation, math	900	x28522
1972B	Coin Games games	900	x25374
1972A	Contest Proposal brute force, greedy, two pointers	800	x25897
1971H	±1 2-sat, dfs and similar, graphs	2100	x2742
1971G	XOUR data structures, dsu, sortings	1700	x11482
1971F	Circle Perimeter binary search, brute force, dfs and similar, geometry, implementation, math	1600	x12460
1971E	Find the Car binary search, math, sortings	1500	x18322
1971D	Binary Cut dp, greedy, implementation, sortings, strings	1100	x30538
1971C	Clock and Strings implementation	900	x41556
1971B	Different String implementation, strings	800	x44683
1971A	My First Sorting Problem implementation, sortings	800	x59424
1970G3	Min-Fund Prison (Hard) bitmasks, dfs and similar, dp, graphs, trees	2400	x546
1970G2	Min-Fund Prison (Medium) brute force, dfs and similar, dp, graphs, trees	2200	x876
1970G1	Min-Fund Prison (Easy) dfs and similar, trees	1900	x1923
1970F3	Playing Quidditch (Hard) implementation	2300	x535
1970F2	Playing Quidditch (Medium) implementation	2300	x514
1970F1	Playing Quidditch (Easy) implementation	2300	x633
1970E3	Trails (Hard) dp, matrices	2200	x1173
1970E2	Trails (Medium) dp, matrices	2000	x2055
1970E1	Trails (Easy) dp	1800	x3425
1970D3	Arithmancy (Hard) interactive	3100	x160
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x309
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x940
1970C3	Game on Tree (Hard) dfs and similar, dp, games, trees	1900	x2441
1970C2	Game on Tree (Medium) dfs and similar, dp, games, trees	1700	x4334
1970C1	Game on Tree (Easy) games	1400	x5030
1970B3	Exact Neighbours (Hard) constructive algorithms	2300	x714
1970B2	Exact Neighbours (Medium) constructive algorithms	2100	x1210
1970B1	Exact Neighbours (Easy) constructive algorithms	1900	x1639
1970A3	Balanced Unshuffle (Hard) constructive algorithms, trees	2400	x665
1970A2	Balanced Unshuffle (Medium) brute force, constructive algorithms, trees	2400	x600
1970A1	Balanced Shuffle (Easy) implementation, sortings	1000	x7231
1969F	Card Pairing dp, greedy, hashing, implementation	3000	x403
1969E	Unique Array binary search, data structures, divide and conquer, dp, greedy	2400	x1854
1969D	Shop Game data structures, greedy, math, sortings	1900	x5704
1969C	Minimizing the Sum dp, implementation	1700	x11491
1969B	Shifts and Sorting constructive algorithms, greedy	1000	x22324
1969A	Two Friends constructive algorithms, implementation, math	800	x22145
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x2507
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x5294
1968F	Equal XOR Segments binary search, data structures	1800	x6926
1968E	Cells Arrangement constructive algorithms	1600	x12633
1968D	Permutation Game brute force, dfs and similar, games, graphs, greedy, math	1300	x17420
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x29257
1968B	Prefiquence greedy, two pointers	800	x31425
1968A	Maximize? brute force, math, number theory	800	x39441
1967F	Next and Prev brute force, data structures, implementation	3200	x98
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x215
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x379

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