Problemset - Codeforces

Rating changes for last rounds are temporarily rolled back. They will be returned soon. ×

→ Pay attention

Before contest
Codeforces Round 945 (Div. 2)
2 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

math

Add tag

Problems

#	Name
1925B	A Balanced Problemset? brute force, greedy, math, number theory	1200	x18260
1924D	Balanced Subsequences combinatorics, dp, math	2700	x778
1924C	Fractal Origami geometry, math, matrices	2400	x1046
1924B	Space Harbour data structures, implementation, math, sortings	2100	x2281
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x7056
1922D	Berserk Monsters brute force, data structures, dsu, implementation, math	1900	x5237
1922C	Closest Cities greedy, implementation, math	1300	x16907
1922B	Forming Triangles combinatorics, constructive algorithms, math, sortings	1200	x19052
1921F	Sum of Progression brute force, data structures, dp, implementation, math	1900	x3461
1921E	Eat the Chip brute force, games, greedy, math	1600	x8932
1921C	Sending Messages greedy, math	900	x27360
1921A	Square greedy, math	800	x40026
1920E	Counting Binary Strings combinatorics, dp, math	2100	x2370
1920D	Array Repetition binary search, brute force, dsu, implementation, math	1900	x5102
1920C	Partitioning the Array brute force, math, number theory	1600	x11849
1920B	Summation Game games, greedy, math, sortings	1100	x19312
1920A	Satisfying Constraints brute force, greedy, math	800	x26518
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x778
1919A	Wallet Exchange games, math	800	x31780
1918G	Permutation of Given constructive algorithms, math	2700	x426
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x12598
1918A	Brick Wall constructive algorithms, greedy, implementation, math	800	x28790
1917E	Construct Matrix constructive algorithms, math	2500	x1270
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1660
1917C	Watering an Array brute force, greedy, implementation, math	1600	x9414
1917A	Least Product constructive algorithms, math	800	x24235
1916H2	Matrix Rank (Hard Version) combinatorics, dp, math, matrices, string suffix structures	2700	x502
1916H1	Matrix Rank (Easy Version) brute force, combinatorics, dp, math, matrices	2700	x584
1916D	Mathematical Problem brute force, constructive algorithms, geometry, math	1700	x7910
1916C	Training Before the Olympiad constructive algorithms, games, greedy, implementation, math	1200	x16707
1916B	Two Divisors constructive algorithms, math, number theory	1000	x23684
1916A	2023 constructive algorithms, implementation, math, number theory	800	x24574
1915E	Romantic Glasses data structures, greedy, math	1300	x18570
1914G1	Light Bulbs (Easy Version) brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees	2100	x1676
1914C	Quests greedy, math	1100	x20811
1914B	Preparing for the Contest constructive algorithms, math	800	x28597
1912I	Innovative Washing Machine geometry, math, two pointers	3300	x54
1912F	Fugitive Frenzy math, probabilities	3100	x105
1912E	Evaluate It and Back Again constructive algorithms, implementation, math	2200	x774
1912D	Divisibility Test math	1900	x1315
1912B	Blueprint for Seating combinatorics, divide and conquer, math	2100	x923
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x76
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x831
1909F1	Small Permutation Problem (Easy Version) brute force, combinatorics, dp, math	2200	x1640
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1251
1909D	Split Plus K greedy, math, number theory	1900	x3988
1909C	Heavy Intervals constructive algorithms, data structures, dsu, greedy, math, sortings	1400	x9988
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x13950
1909A	Distinct Buttons implementation, math	800	x15730
1907C	Removal of Unattractive Pairs constructive algorithms, greedy, math, strings	1200	x18437
1906M	Triangle Construction greedy, math	1700	x2330
1906K	Deck-Building Game divide and conquer, math	2500	x264
1905E	One-X combinatorics, dfs and similar, dp, math, trees	2400	x856
1905D	Cyclic MEX data structures, implementation, math, two pointers	2000	x3509
1905A	Constructive Problems constructive algorithms, math	800	x21818
1903E	Geo Game greedy, interactive, math	2000	x1806
1902F	Trees and XOR Queries Again data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees	2400	x897
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x12292
1901D	Yet Another Monster Fight binary search, dp, greedy, implementation, math	1700	x6187
1901C	Add, Divide and Floor constructive algorithms, greedy, math	1400	x10712
1901B	Chip and Ribbon greedy, math	1100	x14029
1901A	Line Trip greedy, math	800	x25397
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3722
1900B	Laura and Operations dp, math	900	x16028
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x12241
1899A	Game with Integers games, math, number theory	800	x38144
1898D	Absolute Beauty greedy, math	1900	x4745
1898B	Milena and Admirer greedy, math	1500	x10502
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x88
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x79
1896F	Bracket Xoring constructive algorithms, greedy, implementation, math	2600	x653
1896D	Ones and Twos binary search, data structures, divide and conquer, math, two pointers	1700	x5198
1895F	Fancy Arrays combinatorics, dp, math, matrices	2600	x630
1895D	XOR Construction bitmasks, constructive algorithms, data structures, math, string suffix structures, trees	1900	x5586
1895C	Torn Lucky Ticket brute force, dp, hashing, implementation, math	1400	x10122
1895B	Points and Minimum Distance greedy, math, sortings	800	x19656
1895A	Treasure Chest math	800	x23446
1891E	Brukhovich and Exams brute force, greedy, implementation, math, sortings	2500	x774
1891D	Suspicious logarithms binary search, brute force, math	1900	x3711
1891B	Deja Vu brute force, math, sortings	1100	x15844
1889B	Doremy's Connecting Plan constructive algorithms, greedy, math, sortings	1700	x6756
1887D	Split binary search, data structures, divide and conquer, dsu, math, trees, two pointers	2700	x818
1886E	I Wanna be the Team Leader bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers	2400	x1337
1886D	Monocarp and the Set combinatorics, data structures, math	2100	x3333
1886B	Fear of the Dark binary search, geometry, math	1200	x15201
1886A	Sum of Three brute force, constructive algorithms, math	800	x24550
1884E	Hard Design greedy, implementation, math	2800	x264
1884D	Counting Rhyme dp, math, number theory	2100	x2809
1884B	Haunted House binary search, greedy, math, two pointers	1100	x11696
1884A	Simple Design brute force, greedy, math	800	x16469
1883C	Raspberries dp, math	1000	x22790
1883A	Morning math	800	x24012
1881D	Divide and Equalize math, number theory	1300	x14518
1881B	Three Threadlets math	900	x23717
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x6607
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x3719
1878C	Vasilije in Cacak math	900	x28555
1878B	Aleksa and Stack constructive algorithms, math	800	x29880
1877C	Joyboard math, number theory	1200	x10085
1877A	Goals of Victory math	800	x18907