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
1357C2	Prepare superposition of basis states with the same parity *special problem		x307
1357C1	Prepare superposition of basis states with 0s *special problem		x350
1357B2	"Is the number divisible by 3?" oracle *special problem		x216
1357B1	"Is the bit string balanced?" oracle *special problem		x216
1357A7	Distinguish Y, XZ, -Y and -XZ *special problem		x185
1357A6	Distinguish four Pauli gates *special problem		x170
1357A5	Distinguish Rz(θ) from Ry(θ) *special problem		x243
1357A4	Distinguish Rz from R1 *special problem		x354
1357A3	Distinguish H from X *special problem		x481
1357A2	Distinguish I, CNOTs and SWAP *special problem		x513
1357A1	Figure out direction of CNOT *special problem		x634
1356D2	Quantum Classification - 2 *special problem		x129
1356D1	Quantum Classification - 1 *special problem		x138
1356C	Prepare state \|01⟩ + \|10⟩ + \|11⟩ *special problem		x305
1356B2	Decrement *special problem		x287
1356B1	Increment *special problem		x286
1356A5	Distinguish Z from -Z *special problem		x334
1356A4	Distinguish I ⊗ X from CNOT *special problem		x461
1356A3	Distinguish Z from S *special problem		x463
1356A2	Distinguish I from Z *special problem		x490
1356A1	Distinguish I from X *special problem		x606
1355F	Guess Divisors Count constructive algorithms, interactive, number theory	2600	x963
1355E	Restorer Distance binary search, greedy, math, sortings, ternary search	2100	x5833
1355D	Game With Array constructive algorithms, math	1400	x19052
1355C	Count Triangles binary search, implementation, math, two pointers	1800	x11944
1355B	Young Explorers dp, greedy, sortings	1200	x27369
1355A	Sequence with Digits brute force, implementation, math	1200	x28797
1354G	Find a Gift binary search, interactive, probabilities	2600	x960
1354F	Summoning Minions constructive algorithms, dp, flows, graph matchings, greedy, sortings	2500	x1476
1354E	Graph Coloring dfs and similar, dp, graphs	2100	x3692
1354D	Multiset binary search, data structures	1900	x10152
1354C2	Not So Simple Polygon Embedding binary search, brute force, geometry, math	2000	x6372
1354C1	Simple Polygon Embedding binary search, geometry, math, ternary search	1400	x16356
1354B	Ternary String binary search, dp, implementation, two pointers	1200	x35270
1354A	Alarm Clock math	900	x24887
1353F	Decreasing Heights brute force, dp	2200	x3611
1353E	K-periodic Garland brute force, dp, greedy	1900	x7796
1353D	Constructing the Array constructive algorithms, data structures, sortings	1600	x20263
1353C	Board Moves math	1000	x38831
1353B	Two Arrays And Swaps greedy, sortings	800	x58081
1353A	Most Unstable Array constructive algorithms, greedy, math	800	x44572
1352G	Special Permutation constructive algorithms	1600	x24787
1352F	Binary String Reconstruction constructive algorithms, dfs and similar, math	1500	x19395
1352E	Special Elements brute force, implementation, two pointers	1500	x24003
1352D	Alice, Bob and Candies implementation	1300	x29837
1352C	K-th Not Divisible by n binary search, math	1200	x69712
1352B	Same Parity Summands constructive algorithms, math	1200	x44784
1352A	Sum of Round Numbers implementation, math	800	x103977
1351C	Skier data structures, implementation	1400	x9292
1351B	Square? brute force, implementation, math	900	x18530
1351A	A+B (Trial Problem) implementation	800	x26928
1350B	Orac and Models dp, math, number theory	1400	x29416
1350A	Orac and Factors math	900	x27371
1349F2	Slime and Sequences (Hard Version) dp, fft, math	3500	x134
1349F1	Slime and Sequences (Easy Version) dp, fft, math	3100	x516
1349E	Slime and Hats constructive algorithms, dp, greedy	3500	x120
1349D	Slime and Biscuits math, probabilities	3200	x1051
1349C	Orac and Game of Life dfs and similar, graphs, implementation, shortest paths	2000	x4820
1349B	Orac and Medians constructive algorithms, greedy, math	2000	x8945
1349A	Orac and LCM data structures, math, number theory	1600	x21611
1348F	Phoenix and Memory data structures, dfs and similar, graphs, greedy	2600	x905
1348E	Phoenix and Berries brute force, dp, greedy, math	2400	x2429
1348D	Phoenix and Science binary search, constructive algorithms, greedy, implementation, math	1900	x9341
1348C	Phoenix and Distribution constructive algorithms, greedy, sortings, strings	1600	x15480
1348B	Phoenix and Beauty constructive algorithms, data structures, greedy, sortings	1400	x27476
1348A	Phoenix and Balance greedy, math	800	x42834
1346I	Pac-Man 2.0 *special problem, dp	2900	x54
1346H	Game with Segments *special problem, data structures, games	2700	x61
1346G	Two IP Cameras *special problem, math, number theory	2300	x150
1346F	Dune II: Battle For Arrakis *special problem, data structures, greedy, math	2000	x252
1346E	Magic Tricks *special problem, dp, graphs	1700	x415
1346D	Constructing the Dungeon *special problem, graphs, greedy	1600	x544
1346C	Spring Cleaning *special problem, greedy, sortings	1600	x677
1346B	Boot Camp *special problem, greedy	1400	x1251
1346A	Color Revolution *special problem, math	1000	x2200
1345B	Card Constructions binary search, brute force, dp, math	1100	x28232
1345A	Puzzle Pieces math	800	x24824
1344F	Piet's Palette matrices	3200	x511
1344E	Train Tracks data structures, trees	3100	x521
1344D	Résumé Review binary search, greedy, math	2700	x1292
1344C	Quantifier Question dfs and similar, dp, graphs, math	2600	x1979
1344B	Monopole Magnets constructive algorithms, dfs and similar, dsu, graphs	2000	x6350
1344A	Hilbert's Hotel math, number theory, sortings	1600	x16498
1343F	Restore the Permutation by Sorted Segments brute force, constructive algorithms, data structures, greedy, implementation	2400	x1399
1343E	Weights Distributing brute force, graphs, greedy, shortest paths, sortings	2100	x5734
1343D	Constant Palindrome Sum brute force, data structures, greedy, two pointers	1700	x13534
1343C	Alternating Subsequence dp, greedy, two pointers	1200	x44042
1343B	Balanced Array constructive algorithms, math	800	x65067
1343A	Candies brute force, math	900	x53369
1342F	Make It Ascending bitmasks, brute force, dp	3000	x988
1342E	Placing Rooks combinatorics, fft, math	2300	x3545
1342D	Multiple Testcases binary search, constructive algorithms, data structures, greedy, sortings, two pointers	1900	x6365
1342C	Yet Another Counting Problem math, number theory	1600	x14995
1342B	Binary Period constructive algorithms, strings	1100	x24581
1342A	Road To Zero greedy, math	1000	x46393
1341B	Nastya and Door greedy, implementation	1300	x21089
1341A	Nastya and Rice math	900	x30423
1340F	Nastya and CBS brute force, data structures, hashing	3300	x716
1340D	Nastya and Time Machine constructive algorithms, dfs and similar, graphs, trees	2600	x1071
1340C	Nastya and Unexpected Guest dfs and similar, dp, graphs, shortest paths	2400	x2415

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