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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bitmasks

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Problems

#	Name
1491D	Zookeeper and The Infinite Zoo bitmasks, constructive algorithms, dp, greedy, math	1800	x8285
1479D	Odd Mineral Resource binary search, bitmasks, brute force, data structures, probabilities, trees	2900	x1333
1479C	Continuous City bitmasks, constructive algorithms	2500	x1442
1476E	Pattern Matching bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings	2300	x2755
1470B	Strange Definition bitmasks, graphs, hashing, math, number theory	1900	x6776
1469E	A Bit Similar bitmasks, brute force, hashing, string suffix structures, strings, two pointers	2400	x2200
1466F	Euclid's nightmare bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings	2100	x3060
1466E	Apollo versus Pan bitmasks, brute force, math	1800	x8361
1463F	Max Correct Set bitmasks, dp, math	3100	x735
1463B	Find The Array bitmasks, constructive algorithms, greedy	1400	x21165
1451E2	Bitwise Queries (Hard Version) bitmasks, constructive algorithms, interactive, math	2300	x3373
1451E1	Bitwise Queries (Easy Version) bitmasks, constructive algorithms, interactive, math	2000	x4917
1450G	Communism bitmasks, dp, trees	3500	x349
1446C	Xor Tree binary search, bitmasks, data structures, divide and conquer, dp, trees	2100	x4089
1439E	Cheat and Win bitmasks, data structures, games, trees	3500	x248
1438E	Yurii Can Do Everything binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers	2500	x1466
1438D	Powerful Ksenia bitmasks, constructive algorithms, math	2200	x4544
1430G	Yet Another DAG Problem bitmasks, dfs and similar, dp, flows, graphs, math	2600	x869
1427E	Xum bitmasks, constructive algorithms, math, matrices, number theory	2500	x1632
1423J	Bubble Cup hypothesis bitmasks, constructive algorithms, dp, math	2400	x887
1423I	Lookup Tables bitmasks	3000	x158
1421A	XORwice bitmasks, greedy, math	800	x35440
1420B	Rock and Lever bitmasks, math	1200	x35781
1416C	XOR Inverse bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees	2000	x5054
1415D	XOR-gun bitmasks, brute force, constructive algorithms	2000	x6159
1411G	No Game No Life bitmasks, games, math, matrices	2700	x890
1411E	Poman Numbers bitmasks, greedy, math, strings	2300	x1829
1401F	Reverse and Swap binary search, bitmasks, data structures	2400	x1953
1400G	Mercenaries bitmasks, brute force, combinatorics, dp, dsu, math, two pointers	2600	x1160
1398G	Running Competition bitmasks, fft, math, number theory	2600	x1280
1395C	Boboniu and Bit Operations bitmasks, brute force, dp, greedy	1600	x15209
1392G	Omkar and Pies bitmasks, dfs and similar, dp, math, shortest paths	2900	x679
1392E	Omkar and Duck bitmasks, constructive algorithms, interactive, math	2100	x3746
1391D	505 bitmasks, brute force, constructive algorithms, dp, greedy, implementation	2000	x5762
1386C	Joker *special problem, bitmasks, data structures, divide and conquer, dsu	2800	x656
1385D	a-Good String bitmasks, brute force, divide and conquer, dp, implementation	1500	x21951
1383C	String Transformation 2 bitmasks, dp, graphs, trees	3100	x663
1383B	GameGame bitmasks, constructive algorithms, dp, games, greedy, math	1900	x5440
1368D	AND, OR and square sum bitmasks, greedy, math	1700	x13647
1365G	Secure Password bitmasks, combinatorics, constructive algorithms, interactive, math	2800	x1415
1364E	X-OR bitmasks, constructive algorithms, divide and conquer, interactive, probabilities	2700	x1551
1362C	Johnny and Another Rating Drop bitmasks, greedy, math	1400	x23689
1362B	Johnny and His Hobbies bitmasks, brute force	1200	x21032
1361C	Johnny and Megan's Necklace binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs	2500	x1834
1360H	Binary Median binary search, bitmasks, brute force, constructive algorithms	2100	x4861
1360F	Spy-string bitmasks, brute force, constructive algorithms, dp, hashing, strings	1700	x13519
1342F	Make It Ascending bitmasks, brute force, dp	3000	x988
1340B	Nastya and Scoreboard bitmasks, dp, graphs, greedy	1700	x8310
1338C	Perfect Triples bitmasks, brute force, constructive algorithms, divide and conquer, math	2200	x3440
1338B	Edge Weight Assignment bitmasks, constructive algorithms, dfs and similar, greedy, math, trees	1800	x9521
1336E2	Chiori and Doll Picking (hard version) bitmasks, brute force, combinatorics, math	3500	x482
1336E1	Chiori and Doll Picking (easy version) bitmasks, brute force, combinatorics, math	2700	x831
1334G	Substring Search bitmasks, brute force, fft	2900	x419
1332D	Walk on Matrix bitmasks, constructive algorithms, math	1700	x8444
1331C	...And after happily lived ever they *special problem, bitmasks		x3213
1329B	Dreamoon Likes Sequences bitmasks, combinatorics, math	1700	x7056
1327G	Letters and Question Marks bitmasks, dp, string suffix structures	2800	x526
1327F	AND Segments bitmasks, combinatorics, data structures, dp, two pointers	2500	x2028
1326F2	Wise Men (Hard Version) bitmasks, dp, math	3200	x679
1326F1	Wise Men (Easy Version) bitmasks, brute force, dp, meet-in-the-middle	2600	x1007
1325D	Ehab the Xorcist bitmasks, constructive algorithms, greedy, number theory	1700	x13589
1322D	Reality Show bitmasks, dp	2800	x882
1322B	Present binary search, bitmasks, constructive algorithms, data structures, math, sortings	2100	x4638
1316E	Team Building bitmasks, dp, greedy, sortings	2300	x5362
1313D	Happy New Year bitmasks, dp, implementation	2500	x1500
1312C	Adding Powers bitmasks, greedy, implementation, math, number theory, ternary search	1400	x18342
1305G	Kuroni and Antihype bitmasks, brute force, dp, dsu, graphs	3500	x1383
1303D	Fill The Bag bitmasks, greedy	1900	x7705
1302F	Keep talking and nobody explodes -- easy bitmasks, brute force, expression parsing		x76
1299D	Around the World bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees	3000	x528
1292F	Nora's Toy Boxes bitmasks, combinatorics, dp	3500	x370
1288D	Minimax Problem binary search, bitmasks, dp	2000	x8285
1285D	Dr. Evil Underscores bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees	1900	x8609
1270C	Make Good bitmasks, constructive algorithms, math	1400	x15037
1261F	Xor-Set bitmasks, divide and conquer, math	3100	x442
1257F	Make Them Similar bitmasks, brute force, hashing, meet-in-the-middle	2400	x2315
1245F	Daniel and Spring Cleaning bitmasks, brute force, combinatorics, dp	2300	x2263
1242C	Sum Balance bitmasks, dfs and similar, dp, graphs	2400	x1947
1238E	Keyboard Purchase bitmasks, dp	2200	x3460
1234F	Yet Another Substring Reverse bitmasks, dp	2200	x2972
1225G	To Make 1 bitmasks, constructive algorithms, dp, greedy, number theory	3100	x659
1225C	p-binary bitmasks, brute force, math	1600	x9787
1221G	Graph And Numbers bitmasks, brute force, combinatorics, dp, meet-in-the-middle	2900	x876
1220D	Alex and Julian bitmasks, math, number theory	1900	x4140
1217C	The Number Of Good Substrings binary search, bitmasks, brute force	1700	x7856
1215E	Marbles bitmasks, dp	2200	x3460
1214G	Feeling Good bitmasks, data structures	3200	x330
1209E2	Rotate Columns (hard version) bitmasks, dp, greedy, sortings	2500	x2299
1209E1	Rotate Columns (easy version) bitmasks, brute force, dp, greedy, sortings	2000	x3250
1208F	Bits And Pieces bitmasks, dfs and similar, dp, greedy	2600	x3300
1207E	XOR Guessing bitmasks, interactive, math	1900	x6654
1205B	Shortest Cycle bitmasks, brute force, graphs, shortest paths	1900	x7445
1202A	You Are Given Two Binary Strings... bitmasks, greedy	1100	x10718
1194E	Count The Rectangles bitmasks, brute force, data structures, geometry, sortings	2200	x2057
1185G1	Playlist for Polycarp (easy version) bitmasks, combinatorics, dp	2100	x3197
1185F	Two Pizzas bitmasks, brute force	2100	x2237
1174D	Ehab and the Expected XOR Problem bitmasks, constructive algorithms	1900	x5041
1168C	And Reachability bitmasks, dp	2200	x2728
1166E	The LCMs Must be Large bitmasks, brute force, constructive algorithms, math, number theory	2100	x3009
1163E	Magical Permutation bitmasks, brute force, constructive algorithms, data structures, graphs, math	2400	x1011

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