Problemset - Codeforces

Please read the new rule regarding the restriction on the use of AI tools. ×

→ Pay attention

Before contest
Codeforces Round 977 (Div. 2)
2 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

math

Add tag

Problems

#	Name
1821F	Timber combinatorics, dp, fft, math	2600	x751
1821D	Black Cells binary search, brute force, greedy, math	1900	x4963
1821C	Tear It Apart brute force, implementation, math, strings	1300	x14282
1821A	Matching combinatorics, math	800	x19775
1820B	JoJo's Incredible Adventures math, strings, two pointers	1100	x14659
1819E	Roads in E City interactive, math, probabilities, trees	3200	x282
1819C	The Fox and the Complete Tree Traversal constructive algorithms, dp, implementation, math, trees	2400	x1472
1817C	Similar Polynomials combinatorics, math	2400	x979
1815F	OH NO1 (-2-3-4) constructive algorithms, graphs, math	3500	x226
1815E	Bosco and Particle dp, math, number theory, strings	3100	x348
1815D	XOR Counting bitmasks, combinatorics, dp, math	2600	x1158
1815A	Ian and Array Sorting greedy, math	1300	x14106
1814D	Balancing Weapons binary search, brute force, data structures, math, two pointers	2500	x868
1814B	Long Legs brute force, math	1700	x10003
1814A	Coins implementation, math	800	x28823
1812E	Not a Geometry Problem special problem, special problem, constructive algorithms, geometry, math		x4011
1812D	Trivial Conjecture *special problem, constructive algorithms, math, number theory		x4661
1811G2	Vlad and the Nice Paths (hard version) binary search, combinatorics, data structures, dp, math, two pointers	2200	x1760
1811G1	Vlad and the Nice Paths (easy version) combinatorics, dp, math	2100	x2073
1811E	Living Sequence binary search, dp, math, number theory	1500	x12303
1811D	Umka and a Long Flight constructive algorithms, implementation, math	1600	x7487
1811B	Conveyor Belts implementation, math	1000	x20357
1811A	Insert Digit greedy, math, strings	800	x31087
1810H	Last Number combinatorics, math	2900	x140
1810F	M-tree data structures, math, sortings, trees	2800	x572
1810D	Climbing the Tree binary search, math	1700	x7435
1810B	Candies constructive algorithms, math, number theory	800	x17504
1809G	Prediction combinatorics, dp, math	2800	x442
1809E	Two Tanks binary search, dp, implementation, math	2400	x839
1809C	Sum on Subarrays constructive algorithms, greedy, math	1500	x12754
1809B	Points on Plane binary search, greedy, math	1000	x19764
1808E3	Minibuses on Venus (hard version) brute force, combinatorics, dp, math	2800	x442
1808B	Playing in a Casino math, sortings	1200	x16875
1806F2	GCD Master (hard version) greedy, math, sortings	2900	x297
1806F1	GCD Master (easy version) greedy, math, number theory, sortings	2900	x354
1806D	DSU Master combinatorics, dp, dsu, math	2500	x913
1806C	Sequence Master brute force, constructive algorithms, math	1600	x7609
1806A	Walking Master geometry, greedy, math	800	x24726
1805F2	Survival of the Weakest (hard version) greedy, math, sortings, two pointers	3100	x349
1805F1	Survival of the Weakest (easy version) binary search, brute force, implementation, math, sortings	2600	x903
1805C	Place for a Selfie binary search, data structures, geometry, math	1400	x12557
1804C	Pull Your Luck brute force, greedy, math, number theory	1500	x12114
1804A	Lame King greedy, math	800	x17935
1802B	Settlement of Guinea Pigs greedy, implementation, math	1000	x13326
1801F	Another n-dimensional chocolate bar dp, math, meet-in-the-middle, number theory	2700	x586
1799G	Count Voting combinatorics, dp, math	2600	x769
1799E	City Union constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math	2300	x1200
1799B	Equalize by Divide brute force, constructive algorithms, greedy, math	1200	x11352
1799A	Recent Actions data structures, greedy, implementation, math	800	x11583
1798F	Gifts from Grandfather Ahmed dp, math, number theory	2500	x495
1798D	Shocking Arrangement constructive algorithms, greedy, math	1600	x9843
1798C	Candy Store greedy, math, number theory	1700	x8188
1797E	Li Hua and Array brute force, data structures, dsu, math, number theory, two pointers	2300	x1270
1796F	Strange Triples brute force, math, number theory	2900	x172
1796C	Maximum Set binary search, math	1600	x10409
1795E	Explosions? binary search, data structures, dp, greedy, math	2200	x2015
1795D	Triangle Coloring combinatorics, math	1600	x9136
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3585
1794C	Scoring Subsequences binary search, greedy, math, two pointers	1300	x13815
1794B	Not Dividing constructive algorithms, greedy, math	900	x22338
1793D	Moscow Gorillas binary search, dp, greedy, implementation, math, two pointers	1800	x6131
1793B	Fedya and Array constructive algorithms, math	1100	x15809
1793A	Yet Another Promotion greedy, math	800	x18030
1792D	Fixed Prefix Permutations binary search, bitmasks, data structures, hashing, math, sortings	1700	x6259
1792C	Min Max Sort binary search, brute force, greedy, math, two pointers	1500	x14111
1792B	Stand-up Comedian greedy, math	1200	x21349
1790F	Timofey and Black-White Tree brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees	2100	x3348
1790C	Premutation brute force, implementation, math	1000	x23847
1790B	Taisia and Dice greedy, greedy, math	800	x27382
1790A	Polycarp and the Day of Pi implementation, math, strings	800	x37010
1789E	Serval and Music Game brute force, dp, implementation, math, number theory	2500	x818
1789C	Serval and Toxel's Arrays combinatorics, dp, implementation, math	1500	x8561
1789A	Serval and Mocha's Array brute force, math, number theory	800	x19089
1788D	Moving Dots binary search, brute force, combinatorics, math, two pointers	2000	x3912
1788C	Matching Numbers constructive algorithms, greedy, math	1300	x17218
1788B	Sum of Two Numbers constructive algorithms, greedy, implementation, math, probabilities	1100	x20027
1788A	One and Two brute force, implementation, math	800	x30705
1787F	Inverse Transformation constructive algorithms, implementation, math	2500	x683
1787E	The Harmonization of XOR bitmasks, constructive algorithms, greedy, math	2100	x2345
1787C	Remove the Bracket dp, greedy, math	1600	x7076
1787B	Number Factorization greedy, math, number theory	1100	x13246
1787A	Exponential Equation constructive algorithms, math	800	x19201
1783E	Game of the Year brute force, data structures, math, number theory	2300	x2108
1783B	Matrix of Differences constructive algorithms, math	1100	x17766
1783A	Make it Beautiful constructive algorithms, math, sortings	800	x30196
1781F	Bracket Insertion combinatorics, dp, math, trees	2700	x864
1781D	Many Perfect Squares brute force, math, number theory	1800	x5493
1781A	Parallel Projection geometry, math	800	x15068
1780G	Delicious Dessert binary search, dsu, hashing, math, number theory, string suffix structures	2400	x728
1780E	Josuke and Complete Graph binary search, brute force, data structures, math, number theory	2400	x1434
1780B	GCD Partition brute force, greedy, math, number theory	1100	x18074
1779B	MKnez's ConstructiveForces Task constructive algorithms, math	900	x23591
1778F	Maximizing Root dfs and similar, dp, graphs, math, number theory, trees	2600	x659
1778E	The Tree Has Fallen! bitmasks, dfs and similar, math, trees	2500	x876
1778D	Flexible String Revisit combinatorics, dp, math, probabilities	2100	x2765
1778B	The Forbidden Permutation greedy, math	1300	x13296
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3480
1777C	Quiz Master binary search, math, number theory, sortings, two pointers	1700	x8525
1777B	Emordnilap combinatorics, greedy, math	900	x17491
1777A	Everybody Likes Good Arrays! greedy, math	800	x24376