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)
2 days
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Problems

#	Name
1117D	Magic Gems dp, math, matrices	2100	x5215
1117C	Magic Ship binary search	1900	x9111
1117B	Emotes greedy, math, sortings	1000	x15736
1117A	Best Subsegment implementation, math	1100	x11457
1116D6	Hessenberg matrix *special problem		x81
1116D5	Creeper *special problem		x152
1116D4	TIE fighter *special problem		x171
1116D3	X-wing fighter *special problem		x207
1116D2	Pattern of increasing blocks *special problem		x236
1116D1	Block diagonal matrix *special problem		x278
1116C3	``Is the number of ones divisible by 3?'' oracle *special problem		x187
1116C2	``Is the bit string periodic?'' oracle *special problem		x189
1116C1	Alternating bits oracle *special problem		x267
1116B2	Not A, not B or not C? *special problem		x62
1116B1	Distinguish three-qubit states *special problem		x136
1116A2	Generate equal superposition of four basis states *special problem		x184
1116A1	Generate state \|00⟩ + \|01⟩ + \|10⟩ *special problem		x328
1115U3	Block unitary *special problem	1700	x201
1115U2	Chessboard unitary *special problem	1600	x239
1115U1	Anti-diagonal unitary *special problem	1500	x269
1115G3	Palindrome checker oracle *special problem	1600	x236
1115G2	OR oracle *special problem	1600	x316
1115G1	AND oracle *special problem	1100	x402
1114F	Please, another Queries on Array? bitmasks, data structures, divide and conquer, math, number theory	2400	x2435
1114E	Arithmetic Progression binary search, interactive, number theory, probabilities	2200	x3190
1114D	Flood Fill dp	1900	x7977
1114C	Trailing Loves (or L'oeufs?) brute force, implementation, math, number theory	1700	x7885
1114B	Yet Another Array Partitioning Task constructive algorithms, greedy, sortings	1500	x9391
1114A	Got Any Grapes? brute force, greedy, implementation	800	x19752
1113B	Sasha and Magnetic Machines greedy, number theory	1300	x8151
1113A	Sasha and His Trip dp, greedy, math	900	x18318
1111E	Tree data structures, dfs and similar, dp, graphs, trees	2500	x1091
1111D	Destroy the Colony combinatorics, dp, math	2600	x1154
1111C	Creative Snap binary search, brute force, divide and conquer, math	1700	x7010
1111B	Average Superhero Gang Power brute force, implementation, math	1700	x6515
1111A	Superhero Transformation implementation, strings	1000	x18093
1110H	Modest Substrings dp, strings	3500	x434
1110G	Tree-Tac-Toe constructive algorithms, games, trees	3100	x742
1110F	Nearest Leaf data structures, trees	2600	x2049
1110E	Magic Stones constructive algorithms, math, sortings	2200	x4718
1110D	Jongmah dp	2200	x3992
1110C	Meaningless Operations constructive algorithms, math, number theory	1500	x10013
1110B	Tape greedy, sortings	1400	x16570
1110A	Parity math	900	x16003
1109F	Sasha and Algorithm of Silence's Sounds data structures, trees	3200	x366
1109E	Sasha and a Very Easy Test data structures, number theory	2700	x599
1109D	Sasha and Interesting Fact from Graph Theory brute force, combinatorics, dp, math, trees	2400	x1501
1109C	Sasha and a Patient Friend binary search, data structures, implementation	2800	x288
1109B	Sasha and One More Name constructive algorithms, hashing, strings	1800	x4536
1109A	Sasha and a Bit of Relax dp, implementation	1600	x9035
1108F	MST Unification binary search, dsu, graphs, greedy	2100	x3567
1108E2	Array and Segments (Hard version) data structures, implementation	2100	x2521
1108E1	Array and Segments (Easy version) brute force, greedy, implementation	1800	x4895
1108D	Diverse Garland constructive algorithms, dp, greedy	1400	x16475
1108C	Nice Garland brute force, greedy, math	1300	x12657
1108B	Divisors of Two Integers brute force, greedy, math, number theory	1100	x25180
1108A	Two distinct points implementation	800	x23342
1107G	Vasya and Maximum Profit binary search, constructive algorithms, data structures, dp, dsu	2400	x1242
1107F	Vasya and Endless Credits dp, flows, graph matchings, graphs, sortings	2600	x953
1107E	Vasya and Binary String dp	2400	x2783
1107D	Compression dp, implementation, math, number theory	1800	x3903
1107C	Brutality greedy, sortings, two pointers	1300	x11016
1107B	Digital root math, number theory	1000	x17721
1107A	Digits Sequence Dividing greedy, strings	900	x12769
1106F	Lunar New Year and a Recursive Sequence math, matrices, number theory	2400	x1182
1106E	Lunar New Year and Red Envelopes data structures, dp	2100	x2816
1106D	Lunar New Year and a Wander data structures, dfs and similar, graphs, greedy, shortest paths	1500	x19644
1106C	Lunar New Year and Number Division greedy, implementation, math, sortings	900	x15906
1106B	Lunar New Year and Food Ordering data structures, implementation	1500	x6997
1106A	Lunar New Year and Cross Counting implementation	800	x12863
1105E	Helping Hiasat bitmasks, brute force, dp, meet-in-the-middle	2200	x1914
1105D	Kilani and the Game dfs and similar, graphs, implementation, shortest paths	1900	x4423
1105C	Ayoub and Lost Array combinatorics, dp, math	1500	x11365
1105B	Zuhair and Strings brute force, implementation, strings	1100	x10555
1105A	Salem and Sticks brute force, implementation	1100	x11550
1104B	Game with string data structures, implementation, math	1200	x16837
1104A	Splitting into digits constructive algorithms, implementation, math	800	x15902
1103E	Radix sum fft, math, number theory	3400	x282
1103D	Professional layer bitmasks, dp	3100	x493
1103C	Johnny Solving constructive algorithms, dfs and similar, graphs, math	2700	x953
1103B	Game with modulo binary search, constructive algorithms, interactive	2000	x3528
1103A	Grid game constructive algorithms, implementation	1400	x10594
1102F	Elongated Matrix binary search, bitmasks, brute force, dp, graphs	2000	x2355
1102E	Monotonic Renumeration combinatorics, sortings	1700	x6914
1102D	Balanced Ternary String greedy, strings	1500	x8561
1102C	Doors Breaking and Repairing games	1200	x14165
1102B	Array K-Coloring greedy, sortings	1400	x11152
1102A	Integer Sequence Dividing math	800	x26613
1101G	(Zero XOR Subset)-less math, matrices	2300	x2199
1101F	Trucks and Cities binary search, dp	2400	x1631
1101E	Polycarp's New Job implementation	1500	x8259
1101D	GCD Counting data structures, dfs and similar, dp, number theory, trees	2000	x5423
1101C	Division and Union sortings	1500	x12027
1101B	Accordion greedy, implementation	1300	x11116
1101A	Minimum Integer math	1000	x18814
1100F	Ivan and Burgers data structures, divide and conquer, greedy, math	2500	x3686
1100E	Andrew and Taxi binary search, dfs and similar, graphs	2200	x2623
1100D	Dasha and Chess constructive algorithms, games, interactive	2500	x916
1100C	NN and the Optical Illusion binary search, geometry, math	1200	x10930
1100B	Build a Contest data structures, implementation	1300	x11774

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