Problemset - Codeforces

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Codeforces Round (Div. 3)
6 days

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Problems

#	Name
1950C	Clock Conversion implementation, math	800	x36547
1950B	Upscaling implementation	800	x34913
1950A	Stair, Peak, or Neither? implementation	800	x46312
1949K	Make Triangle constructive algorithms, math	2800	x258
1949J	Amanda the Amoeba graphs, implementation, trees, two pointers	2600	x329
1949I	Disks dfs and similar, geometry, graph matchings, graphs	1800	x1347
1949H	Division Avoidance greedy, math	3100	x78
1949G	Scooter graphs, greedy	2300	x671
1949F	Dating greedy, sortings, trees	2200	x817
1949E	Damage per Second brute force, math	2900	x89
1949D	Funny or Scary? constructive algorithms	2600	x317
1949C	Annual Ants' Gathering dfs and similar, dp, greedy, trees	1900	x1369
1949B	Charming Meals binary search, brute force, greedy, sortings	1500	x2301
1949A	Grove brute force, dfs and similar, dp, geometry, probabilities	3300	x91
1948G	MST with Matching bitmasks, brute force, dsu, graph matchings, trees	3100	x648
1948F	Rare Coins combinatorics, math, probabilities	2500	x1185
1948E	Clique Partition brute force, constructive algorithms, graphs, greedy, implementation	2100	x2717
1948D	Tandem Repeats? brute force, strings, two pointers	1700	x8520
1948C	Arrow Path brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths	1300	x15123
1948B	Array Fix brute force, dp, greedy, implementation	1100	x21160
1948A	Special Characters brute force, constructive algorithms	800	x27021
1946F	Nobody is needed 2-sat, data structures, dfs and similar, dp	2500	x810
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2198
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x4230
1946C	Tree Cutting binary search, dp, greedy, implementation, trees	1600	x9583
1946B	Maximum Sum dp, greedy, math	1100	x18730
1946A	Median of an Array greedy, implementation, sortings	800	x24487
1945H	GCD is Greater brute force, data structures, math, number theory	2600	x548
1945G	Cook and Porridge binary search, constructive algorithms, data structures, implementation	2500	x662
1945F	Kirill and Mushrooms data structures, sortings	1900	x3756
1945E	Binary Search binary search, constructive algorithms, greedy	1700	x7319
1945D	Seraphim the Owl dp, greedy	1300	x12900
1945C	Left and Right Houses brute force	1200	x13528
1945B	Fireworks math, number theory	900	x20642
1945A	Setting up Camp greedy, math	800	x25740
1944B	Equal XOR bitmasks, constructive algorithms	1100	x14931
1944A	Destroying Bridges graphs, greedy, math	800	x22036
1943F	Minimum Hamming Distance dp	3500	x88
1943E2	MEX Game 2 (Hard Version) binary search, greedy, two pointers	3300	x256
1943E1	MEX Game 2 (Easy Version) binary search, brute force, greedy	2900	x387
1943D2	Counting Is Fun (Hard Version) combinatorics, dp	2800	x637
1943D1	Counting Is Fun (Easy Version) brute force, combinatorics, dp, math	2400	x1307
1943C	Tree Compass constructive algorithms, dfs and similar, greedy, trees	2300	x1886
1943B	Non-Palindromic Substring hashing, implementation, math, strings	2000	x3461
1943A	MEX Game 1 games, greedy	1300	x16080
1942H	Farmer John's Favorite Intern data structures, dp, flows, trees	3500	x72
1942G	Bessie and Cards combinatorics, dp, math	2800	x395
1942F	Farmer John's Favorite Function brute force, data structures, implementation, math	2700	x603
1942E	Farm Game combinatorics, games	2300	x1514
1942D	Learning to Paint binary search, data structures, dfs and similar, dp, greedy, implementation, sortings	2100	x2538
1942C2	Bessie's Birthday Cake (Hard Version) geometry, greedy, math	1700	x5705
1942C1	Bessie's Birthday Cake (Easy Version) geometry, greedy, math	1300	x9989
1942B	Bessie and MEX constructive algorithms, math	1100	x12815
1942A	Farmer John's Challenge constructive algorithms, math	800	x16238
1941G	Rudolf and Subway constructive algorithms, dfs and similar, graphs, shortest paths	2000	x3131
1941F	Rudolf and Imbalance binary search, greedy, sortings, two pointers	1800	x5400
1941E	Rudolf and k Bridges binary search, data structures, dp, two pointers	1600	x8558
1941D	Rudolf and the Ball Game dfs and similar, dp, implementation	1200	x17148
1941C	Rudolf and the Ugly String dp, greedy, strings	900	x30726
1941B	Rudolf and 121 brute force, dp, greedy, math	1000	x27379
1941A	Rudolf and the Ticket brute force, math	800	x39996
1940D	Almost Certainly *special problem, constructive algorithms, data structures, sortings		x125
1940C	Burenka and Pether *special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees		x33
1940B	Three Arrays *special problem, constructive algorithms, implementation, sortings		x178
1940A	Parallel Universes *special problem, constructive algorithms, dfs and similar, dsu, graphs		x81
1939D	Big Persimmon *special problem, dp, games		x84
1939C	More Gifts *special problem, dfs and similar, two pointers		x280
1939B	Evidence Board *special problem, constructive algorithms, dfs and similar, graphs, trees		x211
1939A	Draw Polygon Lines *special problem, constructive algorithms, dp, geometry, interactive		x20
1938M	Zig-zag	3500	x46
1938L	XOR Operations	2800	x255
1938K	Tree Quiz	2400	x541
1938J	There and Back Again	2100	x1134
1938I	Symmetric Boundary	2800	x55
1938H	Pho Restaurant	1600	x1911
1938G	Personality Test	2300	x888
1938F	Forming Groups	2400	x669
1938E	Duplicates	2200	x876
1938D	Bánh Bò	3300	x81
1938C	Bit Counting Sequence	1900	x1292
1938B	Attraction Score	3000	x152
1938A	Antiparticle Antiphysics	3500	x39
1937B	Binary Path dp, greedy, implementation	1300	x13653
1937A	Shuffle Party implementation, math	800	x22028
1936F	Grand Finale: Circles binary search, geometry	3300	x72
1936E	Yet Yet Another Permutation Problem divide and conquer, fft, math	3400	x99
1936D	Bitwise Paradox binary search, bitmasks, data structures, greedy, two pointers	3100	x442
1936C	Pokémon Arena data structures, graphs, greedy, implementation, shortest paths, sortings	2400	x1150
1936B	Pinball binary search, data structures, implementation, math, two pointers	2000	x2545
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x6781
1935F	Andrey's Tree binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees	2800	x405
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1212
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x7564
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x7409
1935B	Informatics in MAC constructive algorithms	1200	x17077
1935A	Entertainment in MAC constructive algorithms, strings	800	x26241
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x193
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1236
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x3187
1934C	Find a Mine binary search, constructive algorithms, geometry, greedy, interactive, math	1700	x6220