Problemset - Codeforces

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Codeforces Round (Div. 1, Based on Zhili Cup 2026)
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Codeforces Round (Div. 2, Based on Zhili Cup 2026)
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Problems

#	Name
2207F	Hanabi binary search, data structures, dp, dsu, flows, graph matchings, graphs, greedy	2900	x268
2196D	Double Bracket Sequence data structures, dp, expression parsing, flows, greedy, strings	2500	x988
2147H	Maxflow GCD Coloring constructive algorithms, flows, graphs	3500	x188
2127H	23 Rises Again brute force, dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation, probabilities, trees	3100	x570
2109F	Penguin Steps binary search, dfs and similar, flows, graphs, shortest paths	3000	x274
2097F	Lost Luggage dp, flows	3500	x185
2089B2	Canteen (Hard Version) binary search, data structures, dp, flows, greedy, two pointers	2300	x1280
2089B1	Canteen (Easy Version) binary search, data structures, flows, greedy, two pointers	1900	x3231
2068K	Amusement Park Rides flows, graphs	3000	x206
2062G	Permutation Factory flows, geometry, graph matchings, graphs	3500	x172
2061H2	Kevin and Stones (Hard Version) flows, graphs	3500	x63
2061H1	Kevin and Stones (Easy Version) flows, graph matchings, graphs	3500	x102
2046D	For the Emperor! flows, graphs	3100	x550
2043D	Problem about GCD brute force, flows, math, number theory	1800	x7668
2038H	Galactic Council flows	3000	x182
2029I	Variance Challenge flows, graphs, greedy	3400	x146
2026E	Best Subsequence bitmasks, dfs and similar, flows, graph matchings, graphs	2500	x2012
2025G	Variable Damage data structures, flows	3000	x230
2009F	Firefly's Queries bitmasks, data structures, flows, math	1700	x8485
1965F	Conference data structures, flows	3300	x278
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x1519
1951I	Growing Trees binary search, constructive algorithms, flows, graphs, greedy	3200	x104
1942H	Farmer John's Favorite Intern data structures, dp, flows, trees	3500	x206
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x4531
1919F2	Wine Factory (Hard Version) data structures, dp, flows, greedy, matrices	2800	x1086
1913E	Matrix Problem flows, graphs	2400	x1331
1895G	Two Characters, Two Colors binary search, data structures, dp, flows, greedy	3100	x324
1866G	Grouped Carriages binary search, data structures, dp, flows, greedy	2100	x2173
1861F	Four Suits binary search, bitmasks, flows, greedy	3200	x297
1852F	Panda Meetups data structures, dp, flows	3500	x147
1797A	Li Hua and Maze constructive algorithms, flows, graphs, greedy, implementation	800	x19473
1783F	Double Sort II dfs and similar, flows, graph matchings, graphs	2500	x1314
1773D	Dominoes combinatorics, flows, graph matchings, greedy	2600	x640
1770D	Koxia and Game constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation	2000	x4394
1766F	MCF flows	2800	x360
1765A	Access Levels bitmasks, dsu, flows, graph matchings	2400	x849
1748E	Yet Another Array Counting Problem binary search, data structures, divide and conquer, dp, flows, math, trees	2300	x2660
1746G	Olympiad Training binary search, data structures, dp, flows, geometry, implementation, sortings	3500	x112
1741G	Kirill and Company bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths	2200	x1934
1728F	Fishermen flows, graph matchings, greedy	3100	x506
1721F	Matching Reduction brute force, constructive algorithms, dfs and similar, flows, graph matchings, graphs, interactive	2800	x514
1717F	Madoka and The First Session constructive algorithms, flows, graph matchings, graphs, implementation	2500	x637
1709F	Multiset of Strings bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees	2500	x680
1706C	Qpwoeirut And The City dp, flows, greedy, implementation	1400	x16139
1684G	Euclid Guess constructive algorithms, flows, graph matchings, math, number theory	2800	x783
1682F	MCMF? data structures, flows, graphs, greedy, sortings, two pointers	2700	x393
1666K	Kingdom Partition flows	3200	x357
1662J	Training Camp flows, graphs		x298
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x919
1624C	Division by Two and Permutation constructive algorithms, flows, graph matchings, greedy, math	1100	x26827
1615H	Reindeer Games binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths	3000	x386
1592F2	Alice and Recoloring 2 constructive algorithms, flows, graph matchings, greedy	2800	x971
1572D	Bridge Club flows, graph matchings, graphs, greedy	2800	x625
1549B	Gregor and the Pawn Game dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation	800	x26812
1533I	Excursions *special problem, constructive algorithms, dfs and similar, flows, graph matchings, graphs		x61
1530D	Secret Santa constructive algorithms, flows, graphs, greedy, math	1600	x10090
1525F	Goblins And Gnomes brute force, dp, flows, graph matchings	2800	x399
1525D	Armchairs dp, flows, graph matchings, greedy	1800	x10841
1519F	Chests and Keys bitmasks, brute force, dfs and similar, dp, flows	3200	x664
1517G	Starry Night Camping constructive algorithms, flows, graphs	3300	x710
1510B	Button Lock flows, graph matchings, graphs	2600	x975
1488I	Demonic Invasion *special problem, flows	3100	x46
1486E	Paired Payment binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths	2200	x3354
1473F	Strange Set flows, math	2700	x1138
1455E	Four Points brute force, constructive algorithms, flows, geometry, greedy, implementation, math, ternary search	2400	x1647
1438C	Engineer Artem 2-sat, chinese remainder theorem, constructive algorithms, fft, flows	2000	x11616
1437C	Chef Monocarp dp, flows, graph matchings, greedy, math, sortings	1800	x12178
1430G	Yet Another DAG Problem bitmasks, dfs and similar, dp, flows, graphs, math	2600	x869
1427G	One Billion Shades of Grey flows, graphs	3300	x497
1426E	Rock, Paper, Scissors brute force, constructive algorithms, flows, greedy, math	1800	x8129
1423B	Valuable Paper binary search, flows, graph matchings, graphs	1900	x2102
1416F	Showing Off flows, graph matchings, greedy, implementation	3300	x602
1408H	Rainbow Triples binary search, data structures, flows, greedy	3300	x550
1404E	Bricks flows, graph matchings, graphs	2800	x1577
1383F	Special Edges flows, graphs	3200	x437
1368H1	Breadboard Capacity (easy version) dp, flows, greedy	3300	x456
1354F	Summoning Minions constructive algorithms, dp, flows, graph matchings, greedy, sortings	2500	x1476
1307G	Cow and Exercise flows, graphs, shortest paths	3100	x597
1288F	Red-Blue Graph constructive algorithms, flows	2900	x644
1264E	Beautiful League constructive algorithms, flows, graph matchings	2700	x928
1263F	Economic Difficulties data structures, dfs and similar, dp, flows, graphs, trees	2400	x951
1252L	Road Construction flows, graphs	2300	x642
1250K	Projectors flows, graphs	3100	x318
1214D	Treasure Island dfs and similar, dp, flows, hashing	1900	x7168
1198E	Rectangle Painting 2 flows, graph matchings, graphs	2500	x1297
1187G	Gang Up flows, graphs	2500	x687
1184B3	The Doctor Meets Vader (Hard) flows, shortest paths	2700	x246
1184B2	The Doctor Meets Vader (Medium) flows, graph matchings, graphs, shortest paths, sortings	2200	x688
1178H	Stock Exchange binary search, flows, graphs	3500	x298
1146G	Zoning Restrictions dp, flows, graphs	2700	x1043
1139E	Maximize Mex flows, graph matchings, graphs	2400	x2273
1119B	Alyona and a Narrow Fridge binary search, flows, greedy, sortings	1300	x16336
1107F	Vasya and Endless Credits dp, flows, graph matchings, graphs, sortings	2600	x952
1090E	Horseback Riding flows, graphs	2300	x676
1082G	Petya and Graph flows, graphs	2400	x2691
1070I	Privatization of Roads in Berland flows, graph matchings, graphs	2400	x778
1061E	Politics flows, graphs	2600	x602
1054F	Electric Scheme flows, graph matchings	2700	x387
1045A	Last chance data structures, flows, graph matchings, graphs, trees	2500	x574
1034B	Little C Loves 3 II brute force, constructive algorithms, flows, graph matchings	2200	x2290

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