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Educational Codeforces Round 165 (Rated for Div. 2)
10:28:56
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Difficulty:
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math
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
1965A
Everything Nim
games
,
greedy
,
math
x7594
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x860
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
x3179
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
x6786
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x599
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1119
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2925
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x9916
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3126
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5509
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x16702
1955A
Yogurt Sale
math
800
x34410
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x182
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1606
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4560
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x14654
1954B
Make It Ugly
implementation
,
math
1200
x14539
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19332
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x902
1952E
Sweep Line
combinatorics
,
games
,
math
x203
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x229
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2890
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4540
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9154
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15806
1950C
Clock Conversion
implementation
,
math
800
x33875
1949K
Make Triangle
constructive algorithms
,
math
x223
1949H
Division Avoidance
greedy
,
math
x68
1949E
Damage per Second
brute force
,
math
x78
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1081
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2028
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17540
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x466
1945B
Fireworks
math
,
number theory
900
x19181
1945A
Setting up Camp
greedy
,
math
800
x24129
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x20805
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1196
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3160
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x352
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x536
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5386
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9310
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12033
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x15343
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26038
1941A
Rudolf and the Ticket
brute force
,
math
800
x38462
1937A
Shuffle Party
implementation
,
math
800
x21268
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x93
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2379
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6477
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1149
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7237
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5967
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16416
1934A
Too Min Too Max
greedy
,
math
800
x23144
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x852
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x9562
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17523
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20247
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x29603
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35098
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x863
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6665
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13452
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2414
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13159
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15649
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x25814
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x976
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13440
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1608
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1480
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4109
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13098
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23637
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x28694
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x207
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1512
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3701
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7390
1928A
Rectangle Cutting
geometry
,
math
800
x21016
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1479
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12257
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25347
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9822
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3189
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18091
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x754
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1027
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2256
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6982
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5163
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16740
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18894
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3410
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8839
1921C
Sending Messages
greedy
,
math
900
x27110
1921A
Square
greedy
,
math
800
x39674
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2334
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5059
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