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
1512E	Permutation by Sum brute force, greedy, math	1600	x11378
1512D	Corrupted Array constructive algorithms, data structures, greedy	1200	x24526
1512C	A-B Palindrome constructive algorithms, implementation, strings	1200	x21705
1512B	Almost Rectangle implementation	800	x26526
1512A	Spy Detected! brute force, implementation	800	x79956
1511G	Chips on a Board bitmasks, brute force, data structures, dp, games, two pointers	2700	x939
1511F	Chainword brute force, data structures, dp, matrices, string suffix structures, strings	2700	x542
1511E	Colorings and Dominoes combinatorics, dp, greedy, math	2100	x2895
1511D	Min Cost String brute force, constructive algorithms, graphs, greedy, strings	1600	x12447
1511C	Yet Another Card Deck brute force, data structures, implementation, trees	1100	x32773
1511B	GCD Length constructive algorithms, math, number theory	1100	x24676
1511A	Review Site greedy	800	x28825
1510K	King's Task brute force, graphs, implementation	1200	x5972
1510J	Japanese Game constructive algorithms, math	2700	x561
1510I	Is It Rated? greedy, interactive, math, probabilities	2700	x587
1510H	Hard Optimization dp	3200	x138
1510G	Guide	2100	x1384
1510F	Fiber Shape	2800	x64
1510E	Equilibrium Point /\textbackslash/\textbackslash	2700	x271
1510D	Digits dp, math, number theory	2100	x2116
1510C	Cactus Not Enough dfs and similar, graph matchings, graphs	2900	x239
1510B	Button Lock flows, graph matchings, graphs	2600	x975
1510A	ASCII Automata Art	3100	x168
1509C	The Sports Festival dp, greedy	1800	x15286
1509B	TMT Document greedy	1100	x23050
1509A	Average Height constructive algorithms	800	x27195
1508F	Optimal Encoding brute force, data structures	3500	x151
1508E	Tree Calendar brute force, constructive algorithms, data structures, dfs and similar, sortings, trees	3100	x392
1508D	Swap Pass constructive algorithms, geometry, sortings	3000	x719
1508C	Complete the MST bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees	2500	x1726
1508B	Almost Sorted binary search, combinatorics, constructive algorithms, implementation	1800	x4430
1508A	Binary Literature constructive algorithms, greedy, implementation, strings, two pointers	1900	x6670
1506G	Maximize the Remaining String brute force, data structures, dp, greedy, strings	2000	x4833
1506F	Triangular Paths constructive algorithms, graphs, math, shortest paths, sortings	2000	x3699
1506E	Restoring the Permutation constructive algorithms, implementation	1500	x14192
1506D	Epic Transformation constructive algorithms, data structures, greedy	1400	x25512
1506C	Double-ended Strings brute force, implementation, strings	1000	x35575
1506B	Partial Replacement greedy, implementation	1100	x21144
1506A	Strange Table math	800	x32429
1505I	Mysterious language again, seriously? *special problem	2200	x609
1505H	L BREAK into program *special problem	2500	x563
1505G	Encoded message *special problem, implementation	2600	x351
1505F	Math *special problem, math	2200	x1590
1505E	Cakewalk *special problem, greedy, implementation, shortest paths	1800	x1923
1505D	Xenolith? Hippodrome? *special problem, number theory	1800	x885
1505C	Fibonacci Words *special problem, implementation	1400	x6704
1505B	DMCA *special problem, implementation, number theory	1600	x6522
1505A	Is it rated - 2 *special problem, implementation, interactive	900	x16082
1504B	Flip the Bits constructive algorithms, greedy, implementation, math	1200	x25679
1504A	Déjà Vu constructive algorithms, strings	800	x22799
1503F	Balance the Cards constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation	3500	x226
1503E	2-Coloring combinatorics, dp, math	3100	x891
1503D	Flip the Cards 2-sat, constructive algorithms, data structures, greedy, sortings, two pointers	2600	x1258
1503C	Travelling Salesman Problem binary search, data structures, dp, greedy, shortest paths, sortings, two pointers	2200	x3844
1503B	3-Coloring constructive algorithms, games, interactive	1700	x7679
1503A	Balance the Bits constructive algorithms, greedy	1600	x14595
1501B	Napoleon Cake dp, implementation, sortings	900	x21070
1501A	Alexey and Train implementation	800	x12225
1500F	Cupboards Jumps dp	3500	x433
1500E	Subset Trick binary search, data structures	3300	x384
1500D	Tiles for Bathroom data structures, sortings, two pointers	2900	x587
1500C	Matrix Sorting bitmasks, brute force, constructive algorithms, greedy, two pointers	2600	x914
1500B	Two chandeliers binary search, brute force, chinese remainder theorem, math, number theory	2200	x2313
1500A	Going Home brute force, hashing, implementation, math	1800	x9505
1499G	Graph Coloring data structures, graphs, interactive	3100	x237
1499F	Diameter Cuts combinatorics, dfs and similar, dp, trees	2400	x1588
1499E	Chaotic Merge combinatorics, dp, math, strings	2400	x1662
1499D	The Number of Pairs dp, math, number theory	2100	x7031
1499C	Minimum Grid Path brute force, data structures, greedy, math	1500	x13416
1499B	Binary Removals brute force, dp, greedy, implementation	1000	x22002
1499A	Domino on Windowsill combinatorics, constructive algorithms, math	800	x21966
1498F	Christmas Game bitmasks, data structures, dfs and similar, dp, games, math, trees	2500	x1058
1498E	Two Houses brute force, graphs, greedy, interactive, sortings	2200	x2122
1498D	Bananas in a Microwave dfs and similar, dp, graphs, implementation	2200	x2501
1498C	Planar Reflections brute force, data structures, dp	1600	x12113
1498B	Box Fitting binary search, bitmasks, data structures, greedy	1300	x23296
1498A	GCD Sum brute force, math	800	x24708
1497E2	Square-Free Division (hard version) data structures, dp, greedy, math, number theory, two pointers	2500	x1913
1497E1	Square-Free Division (easy version) data structures, dp, greedy, math, number theory, two pointers	1700	x9107
1497D	Genius bitmasks, dp, graphs, number theory	2500	x1736
1497C2	k-LCM (hard version) constructive algorithms, math	1600	x19472
1497C1	k-LCM (easy version) constructive algorithms, math	1200	x29216
1497B	M-arrays constructive algorithms, greedy, math	1200	x27318
1497A	Meximization brute force, data structures, greedy, sortings	800	x26081
1496B	Max and Mex math	1100	x18274
1496A	Split it! brute force, constructive algorithms, greedy, strings	900	x22241
1495F	Squares constructive algorithms, data structures, dp, graphs, trees	3300	x422
1495E	Qingshan and Daniel brute force, data structures, greedy, implementation	3200	x538
1495D	BFS Trees combinatorics, dfs and similar, graphs, math, shortest paths, trees	2600	x1537
1495C	Garden of the Sun constructive algorithms, graphs	2300	x2905
1495B	Let's Go Hiking games, greedy	1900	x6332
1495A	Diamond Miner geometry, greedy, math, sortings	1200	x17876
1494F	Delete The Edges brute force, constructive algorithms, dfs and similar, graphs, implementation	2900	x497
1494E	A-Z Graph constructive algorithms, data structures, graphs, hashing	2400	x2054
1494D	Dogeforces constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees	2300	x2819
1494C	1D Sokoban binary search, dp, greedy, implementation, two pointers	1900	x5726
1494B	Berland Crossword bitmasks, brute force, greedy, implementation	1400	x15315
1494A	ABC String bitmasks, brute force, implementation	900	x22806
1493F	Enchanted Matrix bitmasks, interactive, number theory	2600	x503
1493E	Enormous XOR bitmasks, constructive algorithms, greedy, math, strings, two pointers	2600	x1086

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