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Before contest
Educational Codeforces Round 167 (Rated for Div. 2)
22:31:34
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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
1952A
Are You a Robot, Again?
strings
x11681
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x70
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x228
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x285
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x694
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3253
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x5025
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x10506
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x13232
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x17987
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3822
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8236
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12998
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x21490
1950C
Clock Conversion
implementation
,
math
800
x36890
1950B
Upscaling
implementation
800
x35216
1950A
Stair, Peak, or Neither?
implementation
800
x46815
1949K
Make Triangle
constructive algorithms
,
math
2800
x263
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x334
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1387
1949H
Division Avoidance
greedy
,
math
3100
x78
1949G
Scooter
graphs
,
greedy
2300
x675
1949F
Dating
greedy
,
sortings
,
trees
2200
x826
1949E
Damage per Second
brute force
,
math
2900
x89
1949D
Funny or Scary?
constructive algorithms
2600
x321
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1398
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x2408
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x94
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x653
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1193
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2742
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8598
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x15284
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x21360
1948A
Special Characters
brute force
,
constructive algorithms
800
x27185
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x821
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2222
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4271
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9686
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x18907
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x24679
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x551
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x674
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3801
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7414
1945D
Seraphim the Owl
dp
,
greedy
1300
x13075
1945C
Left and Right Houses
brute force
1200
x13707
1945B
Fireworks
math
,
number theory
900
x20922
1945A
Setting up Camp
greedy
,
math
800
x26025
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x15098
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x22222
1943F
Minimum Hamming Distance
dp
3500
x89
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x261
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x391
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x641
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1318
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1898
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3500
1943A
MEX Game 1
games
,
greedy
1300
x16293
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x72
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x400
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x614
1942E
Farm Game
combinatorics
,
games
2300
x1527
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2563
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5747
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x10095
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12936
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16339
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3173
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5455
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8661
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x17290
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x31025
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x27639
1941A
Rudolf and the Ticket
brute force
,
math
800
x40259
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x126
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
x181
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
x282
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x213
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x20
1938M
Zig-zag
3500
x47
1938L
XOR Operations
2800
x256
1938K
Tree Quiz
2400
x543
1938J
There and Back Again
2100
x1141
1938I
Symmetric Boundary
2800
x55
1938H
Pho Restaurant
1600
x1926
1938G
Personality Test
2300
x892
1938F
Forming Groups
2400
x670
1938E
Duplicates
2200
x883
1938D
Bánh Bò
3300
x82
1938C
Bit Counting Sequence
1900
x1306
1938B
Attraction Score
3000
x171
1938A
Antiparticle Antiphysics
3500
x43
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x13788
1937A
Shuffle Party
implementation
,
math
800
x22132
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x74
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x101
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