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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dsu

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Problems

#	Name
1416D	Graph and Queries data structures, dsu, graphs, implementation, trees	2600	x2709
1411C	Peaceful Rooks dfs and similar, dsu, graphs	1700	x8576
1408G	Clusterization Counting combinatorics, dp, dsu, fft, graphs, trees	2700	x1297
1408E	Avoid Rainbow Cycles data structures, dsu, graphs, greedy, sortings, trees	2400	x2182
1402A	Fancy Fence *special problem, data structures, dsu, implementation, math, sortings	1800	x1352
1400G	Mercenaries bitmasks, brute force, combinatorics, dp, dsu, math, two pointers	2600	x1159
1386C	Joker *special problem, bitmasks, data structures, divide and conquer, dsu	2800	x655
1385G	Columns Swaps 2-sat, dfs and similar, dsu, graphs, implementation	2300	x1814
1383A	String Transformation 1 dsu, graphs, greedy, sortings, strings, trees, two pointers	1700	x11262
1380E	Merging Towers data structures, dsu, implementation, trees	2300	x2408
1370D	Odd-Even Subsequence binary search, dp, dsu, greedy, implementation	2000	x10901
1365D	Solve The Maze constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths	1700	x20794
1361C	Johnny and Megan's Necklace binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs	2500	x1834
1344B	Monopole Magnets constructive algorithms, dfs and similar, dsu, graphs	2000	x6350
1335F	Robots on a Grid data structures, dfs and similar, dsu, graphs, greedy, matrices	2200	x2421
1332C	K-Complete Word dfs and similar, dsu, greedy, implementation, strings	1500	x20842
1307F	Cow and Vacation dfs and similar, dsu, trees	3300	x675
1305G	Kuroni and Antihype bitmasks, brute force, dp, dsu, graphs	3500	x1383
1303F	Number of Components dsu, implementation	2800	x614
1292A	NEKO's Maze Game data structures, dsu, implementation	1400	x13870
1290C	Prefix Enlightenment dfs and similar, dsu, graphs	2400	x2012
1278D	Segment Tree data structures, dsu, graphs, trees	2100	x4327
1276B	Two Fairs combinatorics, dfs and similar, dsu, graphs	1900	x5667
1263D	Secret Passwords dfs and similar, dsu, graphs	1500	x15993
1254E	Send Tree to Charlie combinatorics, dfs and similar, dsu, trees	3300	x366
1253F	Cheap Robot binary search, dsu, graphs, shortest paths, trees	2500	x2250
1253D	Harmonious Graph constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings	1700	x10241
1249B2	Books Exchange (hard version) dfs and similar, dsu, math	1300	x18384
1249B1	Books Exchange (easy version) dsu, math	1000	x22278
1245D	Shichikuji and Power Grid dsu, graphs, greedy, shortest paths, trees	1900	x9588
1242B	0-1 MST dfs and similar, dsu, graphs, sortings	1900	x9233
1236E	Alice and the Unfair Game binary search, data structures, dp, dsu	2500	x731
1220E	Tourism dfs and similar, dp, dsu, graphs, greedy, trees	2200	x3000
1217F	Forced Online Queries Problem data structures, divide and conquer, dsu, graphs, trees	2600	x722
1213G	Path Queries divide and conquer, dsu, graphs, sortings, trees	1800	x9513
1213F	Unstable String Sort data structures, dfs and similar, dsu, graphs, greedy, implementation, strings	2100	x3020
1209G1	Into Blocks (easy version) data structures, dsu, greedy, implementation, two pointers	2000	x3950
1209D	Cow and Snacks dfs and similar, dsu, graphs	1700	x10719
1184E3	Daleks' Invasion (hard) data structures, dsu, graphs, trees	2400	x666
1176E	Cover it! dfs and similar, dsu, graphs, shortest paths, trees	1700	x13545
1167C	News Distribution dfs and similar, dsu, graphs	1400	x25945
1166F	Vicky's Delivery Service data structures, dsu, graphs, hashing	2400	x812
1156E	Special Segments of Permutation data structures, divide and conquer, dsu, two pointers	2200	x4016
1156D	0-1-Tree dfs and similar, divide and conquer, dp, dsu, trees	2200	x4656
1140F	Extending Set of Points data structures, divide and conquer, dsu	2600	x1555
1139C	Edgy Trees dfs and similar, dsu, graphs, math, trees	1500	x16638
1133F2	Spanning Tree with One Fixed Degree constructive algorithms, dfs and similar, dsu, graphs, greedy	1900	x3819
1131F	Asya And Kittens constructive algorithms, dsu	1700	x7741
1131D	Gourmet choice dfs and similar, dp, dsu, graphs, greedy	2000	x3631
1130C	Connect brute force, dfs and similar, dsu	1400	x9404
1120D	Power Tree dfs and similar, dp, dsu, graphs, greedy, trees	2500	x1774
1108F	MST Unification binary search, dsu, graphs, greedy	2100	x3565
1107G	Vasya and Maximum Profit binary search, constructive algorithms, data structures, dp, dsu	2400	x1242
1095F	Make It Connected dsu, graphs, greedy	1900	x7532
1081D	Maximum Distance dsu, graphs, shortest paths, sortings	1800	x4644
1055B	Alice and Hairdresser dsu, implementation	1300	x5541
1051G	Distinctification data structures, dsu, greedy	2900	x480
1044D	Deduction Queries data structures, dsu	2400	x1186
1042F	Leaf Sets data structures, dfs and similar, dsu, graphs, greedy, sortings, trees	2400	x1490
1039C	Network Safety dfs and similar, dsu, graphs, math, sortings	2200	x1490
1027F	Session in BSU binary search, dfs and similar, dsu, graph matchings, graphs	2400	x1947
1023F	Mobile Phone Network dfs and similar, dsu, graphs, trees	2600	x1009
1012E	Cycle sort dsu, math	3100	x396
1012B	Chemical table constructive algorithms, dfs and similar, dsu, graphs, matrices	1900	x4385
1009F	Dominant Indices data structures, dsu, trees	2300	x7733
990G	GCD Counting divide and conquer, dp, dsu, number theory, trees	2400	x2302
986C	AND Graph bitmasks, dfs and similar, dsu, graphs	2500	x2713
982D	Shark brute force, data structures, dsu, trees	1900	x2516
979D	Kuro and GCD and XOR and SUM binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees	2200	x2174
977E	Cyclic Components dfs and similar, dsu, graphs	1500	x25574
962G	Visible Black Areas data structures, dsu, geometry, trees	2800	x207
959B	Mahmoud and Ehab and the message dsu, greedy, implementation	1200	x10550
939D	Love Rescue dfs and similar, dsu, graphs, greedy, strings	1600	x8105
938G	Shortest Path Queries bitmasks, data structures, dsu, graphs	2900	x1089
936E	Iqea data structures, dfs and similar, divide and conquer, dsu, shortest paths, trees	3400	x254
920F	SUM and REPLACE brute force, data structures, dsu, number theory	2000	x8583
920E	Connected Components? data structures, dfs and similar, dsu, graphs	2100	x7733
915F	Imbalance Value of a Tree data structures, dsu, graphs, trees	2400	x3050
902B	Coloring a Tree dfs and similar, dsu, greedy	1200	x11947
901C	Bipartite Segments binary search, data structures, dfs and similar, dsu, graphs, two pointers	2300	x1298
899E	Segments Removal data structures, dsu, flows, implementation, two pointers	2000	x3517
896E	Welcome home, Chtholly data structures, dsu	3100	x2505
891C	Envy data structures, dsu, graphs	2300	x3003
886C	Petya and Catacombs dsu, greedy, implementation, trees	1300	x5675
884E	Binary Matrix dsu	2500	x777
875F	Royal Questions dsu, graphs, greedy	2500	x1584
875B	Sorting the Coins dsu, implementation, sortings, two pointers	1500	x5392
873F	Forbidden Indices dsu, string suffix structures, strings	2400	x1860
870E	Points, Lines and Ready-made Titles dfs and similar, dsu, graphs, trees	2300	x1316
859E	Desk Disorder combinatorics, dfs and similar, dsu, graphs, trees	2100	x2113
843A	Sorting by Subsequences dfs and similar, dsu, implementation, math, sortings	1400	x5958
817D	Imbalanced Array data structures, divide and conquer, dsu, sortings	1900	x6258
813F	Bipartite Checking data structures, dsu, graphs	2500	x1708
811E	Vladik and Entertaining Flags data structures, dsu, graphs	2600	x979
788B	Weird journey combinatorics, constructive algorithms, dfs and similar, dsu, graphs	2100	x2887
778C	Peterson Polyglot brute force, dfs and similar, dsu, hashing, strings, trees	2500	x983
776D	The Door Problem 2-sat, dfs and similar, dsu, graphs	2000	x6198
771A	Bear and Friendship Condition dfs and similar, dsu, graphs	1500	x17724
766D	Mahmoud and a Dictionary data structures, dfs and similar, dp, dsu, graphs	2000	x3925
765D	Artsem and Saunders constructive algorithms, dsu, math	1700	x2600

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