Problemset - Codeforces

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Educational Codeforces Round 170 (Rated for Div. 2)
13 days

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Difficulty: —

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Problems

#	Name
1910A	Username *special problem, implementation	1100	x1764
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x118
1909H	Parallel Swaps Sort constructive algorithms, data structures	3500	x77
1909G	Pumping Lemma hashing, strings	3000	x390
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x928
1909F1	Small Permutation Problem (Easy Version) brute force, combinatorics, dp, math	2200	x1786
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1372
1909D	Split Plus K greedy, math, number theory	1900	x4390
1909C	Heavy Intervals constructive algorithms, data structures, dsu, greedy, math, sortings	1400	x11086
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x16808
1909A	Distinct Buttons implementation, math	800	x16480
1907G	Lights brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation	2200	x1912
1907F	Shift and Reverse greedy, sortings	1800	x4850
1907E	Good Triples brute force, combinatorics, number theory	1600	x10137
1907D	Jumping Through Segments binary search, constructive algorithms	1400	x14050
1907C	Removal of Unattractive Pairs constructive algorithms, greedy, math, strings	1200	x20090
1907B	YetnotherrokenKeoard data structures, implementation, strings	1000	x25343
1907A	Rook implementation	800	x36502
1906M	Triangle Construction greedy, math	1700	x2638
1906L	Palindromic Parentheses constructive algorithms	2500	x512
1906K	Deck-Building Game divide and conquer, math	2500	x298
1906J	Count BFS Graph combinatorics, dp	2100	x755
1906I	Contingency Plan 2 graph matchings	2900	x148
1906H	Twin Friends combinatorics, dp	2200	x695
1906G	Grid Game 2 games, number theory	2900	x197
1906F	Maximize The Value data structures, sortings	2100	x1104
1906E	Merge Not Sort constructive algorithms, dp	1900	x1525
1906D	Spaceship Exploration binary search, geometry	2800	x113
1906C	Cursed Game interactive	3000	x182
1906B	Button Pressing bitmasks, constructive algorithms, hashing	2600	x562
1906A	Easy As ABC brute force	1000	x4060
1905F	Field Should Not Be Empty brute force, data structures, divide and conquer	2600	x533
1905E	One-X combinatorics, dfs and similar, dp, math, trees	2400	x959
1905D	Cyclic MEX data structures, implementation, math, two pointers	2000	x3823
1905C	Largest Subsequence greedy, strings	1400	x12206
1905B	Begginer's Zelda greedy, trees	1100	x16317
1905A	Constructive Problems constructive algorithms, math	800	x22901
1904F	Beautiful Tree data structures, dfs and similar, graphs, implementation, trees	2800	x370
1904E	Tree Queries data structures, dfs and similar, graphs, implementation, trees	2500	x977
1904D2	Set To Max (Hard Version) constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings	1800	x4388
1904D1	Set To Max (Easy Version) brute force, constructive algorithms, greedy	1600	x6663
1904C	Array Game binary search, brute force, data structures, sortings, two pointers	1400	x12920
1904B	Collecting Game binary search, dp, greedy, sortings, two pointers	1100	x15252
1904A	Forked! brute force, implementation	900	x19687
1903F	Babysitting 2-sat, binary search, data structures, graphs, trees	2500	x616
1903E	Geo Game greedy, interactive, math	2000	x2016
1903D2	Maximum And Queries (hard version) bitmasks, divide and conquer, dp, greedy	2500	x770
1903D1	Maximum And Queries (easy version) binary search, bitmasks, brute force, greedy	1700	x5666
1903C	Theofanis' Nightmare constructive algorithms, greedy	1400	x11835
1903B	StORage room bitmasks, brute force, constructive algorithms, greedy	1200	x12725
1903A	Halloumi Boxes brute force, greedy, sortings	800	x31740
1902F	Trees and XOR Queries Again data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees	2400	x1013
1902E	Collapsing Strings data structures, strings, trees	1900	x4270
1902D	Robot Queries binary search, data structures, dp, implementation	1900	x4110
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x13661
1902B	Getting Points binary search, brute force, greedy	1100	x14358
1902A	Binary Imbalance constructive algorithms	800	x21036
1901F	Landscaping binary search, geometry, two pointers	2900	x153
1901E	Compressed Tree dfs and similar, dp, graphs, greedy, sortings, trees	2200	x1525
1901D	Yet Another Monster Fight binary search, dp, greedy, implementation, math	1700	x6919
1901C	Add, Divide and Floor constructive algorithms, greedy, math	1400	x11888
1901B	Chip and Ribbon greedy, math	1100	x14939
1901A	Line Trip greedy, math	800	x31760
1900F	Local Deletions binary search, data structures, implementation	2800	x287
1900E	Transitive Graph dfs and similar, dp, dsu, graphs, implementation	2100	x2061
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x4163
1900C	Anji's Binary Tree dfs and similar, dp, trees	1300	x11447
1900B	Laura and Operations dp, math	900	x17373
1900A	Cover in Water constructive algorithms, greedy, implementation, strings	800	x27515
1899G	Unusual Entertainment data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers	1900	x3199
1899F	Alex's whims constructive algorithms, graphs, greedy, shortest paths, trees	1600	x7576
1899E	Queue Sort greedy, implementation, sortings	1300	x15408
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x13471
1899C	Yarik and Array dp, greedy, two pointers	1100	x20992
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x20536
1899A	Game with Integers games, math, number theory	800	x45719
1898F	Vova Escapes the Matrix brute force, dfs and similar, divide and conquer, shortest paths	2600	x815
1898E	Sofia and Strings data structures, greedy, sortings, strings, two pointers	2200	x2264
1898D	Absolute Beauty greedy, math	1900	x5231
1898C	Colorful Grid constructive algorithms	1700	x5491
1898B	Milena and Admirer greedy, math	1500	x11809
1898A	Milica and String brute force, implementation, strings	800	x15977
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x101
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x87
1896G	Pepe Racing constructive algorithms, implementation, interactive, sortings	3200	x343
1896F	Bracket Xoring constructive algorithms, greedy, implementation, math	2600	x716
1896E	Permutation Sorting data structures, sortings	2100	x2216
1896D	Ones and Twos binary search, data structures, divide and conquer, math, two pointers	1700	x5712
1896C	Matching Arrays binary search, constructive algorithms, greedy, sortings	1400	x9561
1896B	AB Flipping greedy, strings, two pointers	900	x14710
1896A	Jagged Swaps sortings	800	x23768
1895G	Two Characters, Two Colors binary search, data structures, dp, flows, greedy	3100	x193
1895F	Fancy Arrays combinatorics, dp, math, matrices	2600	x756
1895E	Infinite Card Game binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers	2300	x1556
1895D	XOR Construction bitmasks, constructive algorithms, data structures, math, string suffix structures, trees	1900	x6015
1895C	Torn Lucky Ticket brute force, dp, hashing, implementation, math	1400	x11064
1895B	Points and Minimum Distance greedy, math, sortings	800	x20433
1895A	Treasure Chest math	800	x24360
1894B	Two Out of Three constructive algorithms	1000	x15865
1894A	Secret Sport implementation, strings	800	x18902