Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 972 (Div. 2)
38:26:15
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

math

Add tag

Problems

#	Name
1624A	Plus One on the Subset math	800	x51553
1623D	Robot Cleaner Revisit implementation, math, probabilities	2300	x1363
1623A	Robot Cleaner brute force, implementation, math	800	x20013
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x644
1622D	Shuffle combinatorics, math, two pointers	2000	x4012
1622B	Berland Music data structures, greedy, math, sortings	1000	x20872
1622A	Construct a Rectangle geometry, math	800	x29958
1621G	Weighted Increasing Subsequences data structures, dp, math	3200	x646
1621D	The Winter Hike constructive algorithms, greedy, math	2100	x4043
1621C	Hidden Permutations dfs and similar, interactive, math	1700	x6868
1620C	BA-String brute force, dp, greedy, implementation, math	1800	x6539
1620B	Triangles on a Rectangle geometry, greedy, math	1000	x20933
1619F	Let's Play the Hat? brute force, constructive algorithms, greedy, math	2000	x2089
1619E	MEX and Increments constructive algorithms, data structures, dp, greedy, implementation, math, sortings	1700	x9125
1619B	Squares and Cubes implementation, math	800	x30669
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4179
1618E	Singers' Tour constructive algorithms, math	1700	x7138
1618D	Array and Operations dp, greedy, math	1300	x18837
1618C	Paint the Array math	1100	x22811
1618A	Polycarp and Sums of Subsequences math, sortings	800	x32201
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x862
1617D2	Too Many Impostors (hard version) constructive algorithms, implementation, interactive, math	2400	x1775
1617C	Paprika and Permutation binary search, greedy, math, sortings	1300	x14924
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x23218
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x909
1616F	Tricolor Triangles brute force, graphs, math, matrices	2900	x592
1616D	Keep the Average High dp, greedy, math	2000	x4876
1616C	Representative Edges brute force, geometry, implementation, math	1500	x12194
1615F	LEGOndary Grandmaster combinatorics, dp, math	2800	x869
1615E	Purple Crayon data structures, dfs and similar, games, graphs, greedy, math, sortings, trees	2400	x1462
1615C	Menorah brute force, graphs, greedy, math	1600	x8343
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x15839
1615A	Closing The Gap greedy, math	800	x20719
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x10200
1613D	MEX Sequences dp, math	1900	x4580
1613A	Long Comparison implementation, math	900	x24415
1612D	X-Magic Pair math, number theory	1600	x9096
1612C	Chat Ban binary search, math	1300	x17123
1611B	Team Composition: Programmers and Mathematicians binary search, constructive algorithms, math	800	x29387
1611A	Make Even constructive algorithms, math	800	x31325
1610E	AmShZ and G.O.A.T. binary search, brute force, greedy, implementation, math	2300	x1666
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2688
1610A	Anti Light's Cell Guessing math	900	x16063
1609G	A Stroll Around the Matrix data structures, greedy, math	3000	x396
1609A	Divide and Multiply greedy, implementation, math, number theory	900	x17046
1608D	Dominoes combinatorics, fft, graphs, math, number theory	2400	x1379
1608A	Find Array constructive algorithms, math	800	x19011
1607D	Blue-Red Permutation greedy, math, sortings	1300	x16778
1607B	Odd Grasshopper math	900	x26076
1606E	Arena combinatorics, dp, math	2100	x3501
1606B	Update Files greedy, implementation, math	1100	x18625
1605E	Array Equalizer binary search, greedy, implementation, math, number theory, sortings, two pointers	2400	x1028
1605A	A.M. Deviation math, number theory	800	x20571
1603F	October 18, 2017 combinatorics, dp, implementation, math	2700	x278
1603E	A Perfect Problem combinatorics, dp, math	3200	x416
1603C	Extreme Extension dp, greedy, math, number theory	2300	x2027
1603B	Moderate Modular Mode constructive algorithms, math, number theory	1600	x13477
1603A	Di-visible Confusion constructive algorithms, math, number theory	1300	x16569
1601F	Two Sorts binary search, dfs and similar, math, meet-in-the-middle	3400	x176
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x14438
1600F	Party Organization brute force, math, probabilities	2300	x482
1599H	Hidden Fortress interactive, math	2100	x1045
1599G	Shortest path brute force, geometry, math, shortest paths	2700	x369
1599C	Bubble Strike combinatorics, math, probabilities, ternary search	2000	x1639
1598G	The Sum of Good Numbers hashing, math, string suffix structures, strings	3200	x330
1598E	Staircases brute force, combinatorics, data structures, dfs and similar, dp, implementation, math	2100	x2292
1598D	Training Session combinatorics, data structures, geometry, implementation, math	1700	x8617
1598C	Delete Two Elements data structures, dp, implementation, math, two pointers	1200	x20716
1594F	Ideal Farm constructive algorithms, math	2400	x1335
1594E2	Rubik's Cube Coloring (hard version) brute force, dp, implementation, math, trees	2300	x1477
1594E1	Rubik's Cube Coloring (easy version) combinatorics, math	1300	x11059
1594C	Make Them Equal brute force, greedy, math, strings	1200	x19235
1594B	Special Numbers bitmasks, math	1100	x19810
1594A	Consecutive Sum Riddle math	800	x24369
1593F	Red-Black Number dfs and similar, dp, implementation, math, meet-in-the-middle	2100	x2431
1593D2	Half of Same brute force, math, number theory	1900	x4960
1593D1	All are Same math, number theory	1100	x20051
1593B	Make it Divisible by 25 dfs and similar, dp, greedy, math, math	900	x26859
1593A	Elections math	800	x36533
1592E	Bored Bakry bitmasks, greedy, math, two pointers	2400	x1619
1592D	Hemose in ICPC ? binary search, dfs and similar, implementation, interactive, math, number theory, trees	2300	x2215
1592B	Hemose Shopping constructive algorithms, dsu, math, sortings	1200	x15907
1592A	Gamer Hemose binary search, greedy, math, sortings	800	x22088
1586I	Omkar and Mosaic combinatorics, constructive algorithms, math	3500	x192
1585F	Non-equal Neighbours combinatorics, dp, math	2400	x1208
1585D	Yet Another Sorting Problem data structures, math	1900	x3833
1584D	Guess the Permutation binary search, combinatorics, interactive, math	2000	x3649
1584C	Two Arrays greedy, math, sortings	900	x16297
1584B	Coloring Rectangles greedy, math	1000	x13306
1584A	Mathematical Addition math	800	x14861
1583G	Omkar and Time Travel data structures, math	3000	x450
1583A	Windblume Ode math, number theory	800	x13710
1582E	Pchelyonok and Segments binary search, data structures, dp, greedy, math	2000	x3714
1582D	Vupsen, Pupsen and 0 constructive algorithms, math	1600	x10459
1582B	Luntik and Subsequences combinatorics, math	900	x20221
1582A	Luntik and Concerts math	800	x18483
1581B	Diameter of Graph constructive algorithms, graphs, greedy, math	1200	x11288
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13395
1580F	Problems for Codeforces combinatorics, fft, math	3300	x133
1579F	Array Stabilization (AND version) brute force, graphs, math, number theory, shortest paths	1700	x4752