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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bitmasks

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Problems

#	Name
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x384
1698A	XOR Mixup bitmasks, brute force	800	x32867
1696A	NIT orz! bitmasks, greedy	800	x20257
1689E	ANDfinity bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2500	x1360
1688B	Patchouli's Magical Talisman bitmasks, constructive algorithms, greedy, sortings	800	x19006
1688A	Cirno's Perfect Bitmasks Classroom bitmasks, brute force	800	x23486
1682B	AND Sorting bitmasks, constructive algorithms, sortings	1100	x26377
1680E	Moving Chips bitmasks, dp, greedy	2000	x4346
1679F	Formalism for Formalism bitmasks, dp, math	2600	x772
1679E	Typical Party in Dorm bitmasks, combinatorics, dp, strings	2400	x1417
1673F	Anti-Theft Road Planning bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math	2400	x960
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x802
1670F	Jee, You See? bitmasks, combinatorics, dp	2400	x1264
1670E	Hemose on the Tree bitmasks, constructive algorithms, dfs and similar, trees	2200	x1937
1669H	Maximal AND bitmasks, greedy, math	1300	x29075
1665E	MinimizOR bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers	2500	x1796
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x4653
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x20648
1659E	AND-MEX Walk bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2200	x1970
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x12029
1658D2	388535 (Hard Version) bitmasks, brute force, data structures, math	2300	x3178
1658D1	388535 (Easy Version) bitmasks, math	1600	x9999
1654F	Minimal String Xoration bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings	2800	x1483
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x19504
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1504
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x7048
1635A	Min Or Sum bitmasks, greedy	800	x25888
1634B	Fortune Telling bitmasks, math	1400	x22288
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x14071
1632B	Roof Construction bitmasks, constructive algorithms	1000	x31512
1630A	And Matching bitmasks, constructive algorithms	1500	x16145
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x2318
1625A	Ancient Civilization bitmasks, greedy, math	800	x18284
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x7593
1622E	Math Test bitmasks, brute force, greedy	2200	x2243
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x1155
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4731
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x1234
1615D	X(or)-mas Tree bitmasks, dfs and similar, dsu, graphs, trees	2200	x2134
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x17911
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x11311
1609E	William The Oblivious bitmasks, data structures, dp, matrices	2400	x2451
1605D	Treelabeling bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees	2100	x3248
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x21068
1600J	Robot Factory bitmasks, dfs and similar	1400	x4417
1599J	Bob's Beautiful Array bitmasks, brute force, greedy	2600	x328
1598F	RBS binary search, bitmasks, brute force, data structures, dp	2400	x1633
1594B	Special Numbers bitmasks, math	1100	x22133
1592E	Bored Bakry bitmasks, greedy, math, two pointers	2400	x1920
1592C	Bakry and Partitioning bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees	1700	x9131
1584F	Strange LCS bitmasks, dp, graphs, greedy, strings	2600	x1116
1583F	Defender of Childhood Dreams bitmasks, constructive algorithms, divide and conquer	2500	x1536
1582F1	Korney Korneevich and XOR (easy version) bitmasks, dp, greedy	1800	x6578
1571E	Fix the String *special problem, bitmasks, dp, greedy	1700	x374
1569E	Playoff Restoration bitmasks, brute force, hashing, implementation, meet-in-the-middle	2600	x875
1567C	Carrying Conundrum bitmasks, combinatorics, dp, math	1600	x13153
1567B	MEXor Mixup bitmasks, greedy	1000	x32903
1566C	MAX-MEX Cut bitmasks, constructive algorithms, dp, greedy	1000	x19034
1566B	MIN-MEX Cut bitmasks, constructive algorithms, dp, greedy	800	x21207
1560F2	Nearest Beautiful Number (hard version) bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy	2100	x4969
1560F1	Nearest Beautiful Number (easy version) binary search, bitmasks, brute force, constructive algorithms, dfs and similar, greedy	1900	x6759
1559A	Mocha and Math bitmasks, constructive algorithms, math	900	x45548
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x10494
1556G	Gates to Another World bitmasks, data structures, dsu, two pointers	3300	x446
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1420
1556D	Take a Guess bitmasks, constructive algorithms, interactive, math	1800	x8583
1554C	Mikasa binary search, bitmasks, greedy, implementation	1800	x9774
1554B	Cobb bitmasks, brute force, greedy, math	1700	x13796
1553H	XOR and Distance bitmasks, divide and conquer, trees	2900	x841
1553C	Penalty bitmasks, brute force, dp, greedy	1200	x19799
1552G	A Serious Referee bitmasks, brute force, dfs and similar, sortings	3000	x670
1552D	Array Differentiation bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math	1800	x7885
1550E	Stringforces binary search, bitmasks, brute force, dp, strings, two pointers	2500	x1838
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1623
1547D	Co-growing Sequence bitmasks, constructive algorithms, greedy	1300	x18586
1543E	The Final Pursuit bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math	2700	x450
1543D1	RPD and Rap Sheet (Easy Version) bitmasks, constructive algorithms, interactive, math	1700	x8000
1543C	Need for Pink Slips bitmasks, brute force, dfs and similar, implementation, math, probabilities	1900	x5625
1533H	Submatrices *special problem, bitmasks, data structures, dp		x92
1530F	Bingo bitmasks, combinatorics, dp, math, probabilities	2600	x992
1527A	And Then There Were K bitmasks	800	x41887
1523F	Favorite Game bitmasks, dp	3300	x483
1523D	Love-Hate bitmasks, brute force, dp, probabilities	2400	x2477
1519F	Chests and Keys bitmasks, brute force, dfs and similar, dp, flows	3200	x664
1516C	Baby Ehab Partitions Again bitmasks, constructive algorithms, dp, math	1700	x14108
1516B	AGAGA XOOORRR bitmasks, brute force, dp, greedy	1500	x25521
1515H	Phoenix and Bits bitmasks, brute force, data structures, sortings	3500	x350
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x34913
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x20092
1511G	Chips on a Board bitmasks, brute force, data structures, dp, games, two pointers	2700	x939
1508C	Complete the MST bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees	2500	x1726
1500C	Matrix Sorting bitmasks, brute force, constructive algorithms, greedy, two pointers	2600	x915
1498F	Christmas Game bitmasks, data structures, dfs and similar, dp, games, math, trees	2500	x1058
1498B	Box Fitting binary search, bitmasks, data structures, greedy	1300	x23321
1497D	Genius bitmasks, dp, graphs, number theory	2500	x1739
1494B	Berland Crossword bitmasks, brute force, greedy, implementation	1400	x15315
1494A	ABC String bitmasks, brute force, implementation	900	x22808
1493F	Enchanted Matrix bitmasks, interactive, number theory	2600	x503
1493E	Enormous XOR bitmasks, constructive algorithms, greedy, math, strings, two pointers	2600	x1086
1492D	Genius's Gambit bitmasks, constructive algorithms, greedy, math	1900	x6512

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