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Educational Codeforces Round 169 (Rated for Div. 2)
19:14:08
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Difficulty:
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x7602
1994C
Hungry Games
binary search
,
dp
,
two pointers
1600
x9200
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x8246
1990C
Mad MAD Sum
brute force
,
greedy
,
math
1500
x9947
1989C
Two Movies
greedy
,
math
1400
x16782
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x14884
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x7966
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x14115
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x5025
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x8447
1985F
Final Boss
binary search
,
data structures
1500
x13913
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x6753
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x15271
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x7455
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x11435
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6500
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x12762
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x9673
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x13373
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x17496
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x10257
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x13761
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x9581
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5517
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x13864
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x14837
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7790
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13198
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8519
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x9214
1971E
Find the Car
binary search
,
math
,
sortings
1500
x13207
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2275
1970C1
Game on Tree (Easy)
games
1400
x2964
1969C
Minimizing the Sum
dp
,
implementation
1700
x7962
1968E
Cells Arrangement
constructive algorithms
1600
x9769
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14124
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12435
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x11649
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x12737
1958D
Staircase
*special problem
1600
x465
1958C
Firewood
*special problem
1500
x636
1958B
Clock in the Pool
*special problem
,
math
1400
x810
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x9061
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12273
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8162
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x14627
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x20200
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x11076
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8670
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x13705
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x2783
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8940
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16023
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x10242
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7735
1945D
Seraphim the Owl
dp
,
greedy
1300
x13778
1943A
MEX Game 1
games
,
greedy
1300
x17016
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5939
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x10519
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9170
1938H
Pho Restaurant
1600
x2038
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x14366
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7105
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6481
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x10746
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7743
1932D
Card Game
greedy
,
implementation
1400
x11001
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x15104
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x7687
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x14946
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x17815
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6823
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x14283
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8170
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13491
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x20321
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x11351
1926D
Vlad and Division
bitmasks
,
greedy
1300
x14913
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x13341
1923C
Find B
constructive algorithms
,
greedy
1400
x14441
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x17929
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9494
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x12929
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x18153
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x13484
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x10029
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x8315
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x12947
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x20482
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11975
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11847
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x14527
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x619
1910B
Security Guard
*special problem
,
greedy
1600
x657
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x10786
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x9766
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x13371
1906M
Triangle Construction
greedy
,
math
1700
x2531
1905C
Largest Subsequence
greedy
,
strings
1400
x11869
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x6362
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