Problemset - Codeforces

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Codeforces Round (Div. 2)
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Problems

#	Name
1856B	Good Arrays implementation, math	900	x23611
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x24885
1855A	Dalton the Teacher greedy, math	800	x27518
1854E	Game Bundles brute force, constructive algorithms, dp, greedy, math	3000	x388
1854C	Expected Destruction combinatorics, dp, math, probabilities	2500	x1415
1854A2	Dual (Hard Version) constructive algorithms, math	1900	x6815
1854A1	Dual (Easy Version) constructive algorithms, math	1400	x13657
1853B	Fibonaccharsis binary search, brute force, math	1200	x16886
1853A	Desorting brute force, greedy, math	800	x29647
1852C	Ina of the Mountain data structures, dp, greedy, math	2400	x1484
1852B	Imbalanced Arrays constructive algorithms, graphs, greedy, math, sortings, two pointers	1800	x4264
1852A	Ntarsis' Set binary search, math, number theory	1800	x7758
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5514
1851D	Prefix Permutation Sums implementation, math	1300	x14688
1851A	Escalator Conversations brute force, constructive algorithms, math	800	x29040
1850G	The Morning Star combinatorics, data structures, geometry, implementation, math, sortings	1500	x11684
1850F	We Were Both Children brute force, implementation, math, number theory	1300	x17966
1850E	Cardboard for Pictures binary search, geometry, implementation, math	1100	x21739
1849B	Monsters greedy, math, sortings	1000	x23867
1849A	Morning Sandwich implementation, math	800	x27402
1848F	Vika and Wiki binary search, bitmasks, combinatorics, divide and conquer, dp, math	2400	x1488
1848E	Vika and Stone Skipping brute force, implementation, math, number theory	2600	x759
1848D	Vika and Bonuses binary search, brute force, math, ternary search	2200	x2547
1848C	Vika and Price Tags math, number theory	1800	x6109
1848B	Vika and the Bridge binary search, data structures, greedy, implementation, math, sortings	1200	x13982
1848A	Vika and Her Friends games, math	900	x16481
1847F	The Boss's Identity binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings	2500	x865
1847E	Triangle Platinum? brute force, combinatorics, implementation, interactive, math, probabilities	2900	x321
1846E2	Rudolf and Snowflakes (hard version) binary search, brute force, implementation, math	1800	x6749
1846E1	Rudolf and Snowflakes (simple version) brute force, implementation, math	1300	x15935
1846D	Rudolph and Christmas Tree constructive algorithms, geometry, math	1200	x18732
1846A	Rudolph and Cut the Rope implementation, math	800	x31916
1845F	Swimmers in the Pool dp, fft, math, number theory	2800	x359
1845E	Boxes and Balls dp, implementation, math	2500	x1289
1845D	Rating System binary search, brute force, data structures, dp, dsu, greedy, math, two pointers	1800	x7510
1845B	Come Together geometry, implementation, math	900	x21173
1845A	Forbidden Integer constructive algorithms, implementation, math, number theory	800	x25610
1844H	Multiple of Three Cycles combinatorics, data structures, dp, dsu, math	3400	x133
1844G	Tree Weights bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees	3000	x674
1844F2	Min Cost Permutation (Hard Version) binary search, constructive algorithms, data structures, greedy, math, sortings	2800	x377
1844F1	Min Cost Permutation (Easy Version) brute force, constructive algorithms, greedy, math	2600	x748
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x11930
1844C	Particles dp, greedy, implementation, math	1300	x15158
1844B	Permutations & Primes constructive algorithms, math	1000	x17745
1843F2	Omsk Metro (hard version) data structures, dfs and similar, divide and conquer, dp, math, trees	2300	x1514
1843F1	Omsk Metro (simple version) data structures, dfs and similar, dp, graphs, greedy, math, trees	1800	x5103
1843D	Apple Tree combinatorics, dfs and similar, dp, math, trees	1200	x17405
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x31887
1843B	Long Long greedy, math, two pointers	800	x28417
1842H	Tenzing and Random Real Numbers bitmasks, dp, graphs, math, probabilities	3000	x581
1842G	Tenzing and Random Operations combinatorics, dp, math, probabilities	2800	x960
1842E	Tenzing and Triangle data structures, dp, geometry, greedy, math	2300	x1561
1842B	Tenzing and Books bitmasks, greedy, math	1100	x16261
1842A	Tenzing and Tsondu games, math	800	x19606
1841E	Fill the Matrix data structures, greedy, math	2200	x1927
1841C	Ranom Numbers brute force, dp, greedy, math, strings	1800	x7474
1840G2	In Search of Truth (Hard Version) constructive algorithms, interactive, math, meet-in-the-middle, probabilities	2500	x914
1840G1	In Search of Truth (Easy Version) constructive algorithms, interactive, math, meet-in-the-middle, probabilities	2200	x2270
1840C	Ski Resort combinatorics, math, two pointers	1000	x25784
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21928
1839A	The Good Array greedy, implementation, math	800	x17241
1838E	Count Supersequences combinatorics, dp, math	2500	x1395
1838C	No Prime Differences constructive algorithms, math, number theory	1400	x13833
1838B	Minimize Permutation Subarrays constructive algorithms, math	1100	x16056
1838A	Blackboard List constructive algorithms, math	800	x21247
1837A	Grasshopper on a Line constructive algorithms, math	800	x30396
1836B	Astrophysicists greedy, math	1100	x12425
1835D	Doctor's Brown Hypothesis dfs and similar, graphs, math, number theory	2900	x462
1835C	Twin Clusters bitmasks, brute force, constructive algorithms, math, probabilities	2600	x951
1835B	Lottery binary search, brute force, greedy, math, two pointers	2500	x920
1835A	k-th equality brute force, implementation, math	1700	x7593
1834F	Typewriter brute force, math	2500	x497
1834E	MEX of LCM binary search, data structures, implementation, math, number theory	2300	x2115
1834C	Game with Reversing games, greedy, math, strings	1200	x12906
1834B	Maximum Strength greedy, math	1000	x14825
1834A	Unit Array greedy, math	800	x22550
1833F	Ira and Flamenco combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers	1700	x6966
1833C	Vlad Building Beautiful Array greedy, math	800	x25761
1832D2	Red-Blue Operations (Hard Version) binary search, constructive algorithms, greedy, implementation, math	2400	x1838
1832D1	Red-Blue Operations (Easy Version) binary search, greedy, implementation, math	2100	x2847
1830E	Bully Sort data structures, math	3500	x235
1830C	Hyperregular Bracket Strings combinatorics, greedy, hashing, math, number theory, sortings	2400	x1570
1830B	The BOSS Can Count Pairs brute force, math	2000	x4707
1829H	Don't Blame Me bitmasks, combinatorics, dp, math	1700	x7343
1829G	Hits Different data structures, dp, implementation, math	1600	x9790
1829F	Forever Winter dfs and similar, graphs, math	1300	x16686
1828B	Permutation Swap math, number theory	900	x21570
1828A	Divisible Array constructive algorithms, math	800	x23249
1827A	Counting Orders combinatorics, math, sortings, two pointers	1100	x18067
1826F	Fading into Fog geometry, interactive, math, probabilities	2800	x343
1826C	Dreaming of Freedom greedy, math, number theory	1300	x13082
1826B	Lunatic Never Content math, number theory	1100	x16473
1825B	LuoTianyi and the Table greedy, math	1000	x14371
1824B2	LuoTianyi and the Floating Islands (Hard Version) combinatorics, dfs and similar, math, probabilities, trees	2300	x2530
1824B1	LuoTianyi and the Floating Islands (Easy Version) combinatorics, math, probabilities, trees	1800	x4417
1823F	Random Walk dp, graphs, math, probabilities, trees	2600	x816
1823E	Removing Graph brute force, dp, games, graphs, math	2500	x1206
1823D	Unique Palindromes constructive algorithms, math, strings	1900	x3726
1823C	Strongly Composite greedy, math, number theory	1300	x11903
1823B	Sort with Step brute force, math, sortings	900	x15644