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Before contest
Codeforces Round (Div. 1, based on COMPFEST 15 - Final Round)
6 days
Before contest
Codeforces Round (Div. 2, based on COMPFEST 15 - Final Round)
6 days
→ Filter Problems
Difficulty:
—
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
1882E2
Two Permutations (Hard Version)
constructive algorithms
x123
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
x610
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
x3277
1882C
Card Game
brute force
,
greedy
x8041
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
x10700
1882A
Increasing Sequence
greedy
x19513
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x256
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x835
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x4184
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x10036
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x15394
1879A
Rigged!
greedy
800
x16690
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
x654
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
x2463
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
x7682
1878D
Reverse Madness
data structures
,
greedy
x5055
1878C
Vasilije in Cacak
math
x19979
1878B
Aleksa and Stack
constructive algorithms
,
math
x23633
1878A
How Much Does Daytona Cost?
greedy
x28185
1875D
Jellyfish and Mex
dp
x3606
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
x6167
1875A
Jellyfish and Undertale
brute force
,
greedy
x13104
1874G
Jellyfish and Inscryption
dp
x12
1874F
Jellyfish and OEIS
dp
x20
1874E
Jellyfish and Hack
dp
,
math
x90
1874D
Jellyfish and Miku
dp
,
math
,
probabilities
x247
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
x812
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
x540
1874A
Jellyfish and Game
brute force
,
greedy
,
implementation
x9761
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x4098
1873G
ABBC or BACB
constructive algorithms
,
greedy
1500
x7386
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x9366
1873E
Building an Aquarium
binary search
,
sortings
1100
x15681
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x24572
1873C
Target Practice
implementation
,
math
800
x25349
1873B
Good Kid
brute force
,
greedy
,
math
800
x31923
1873A
Short Sort
brute force
,
implementation
800
x34223
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x2809
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x4224
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x8834
1872D
Plus Minus Permutation
math
1200
x15461
1872C
Non-coprime Split
math
,
number theory
1100
x17775
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x22076
1872A
Two Vessels
brute force
,
greedy
,
math
800
x30657
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x36
1870G
MEXanization
data structures
3300
x123
1870F
Lazy Numbers
binary search
,
math
2900
x312
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x1678
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x4962
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x8425
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x10522
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x16039
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x10989
1869A
Make It Zero
constructive algorithms
900
x13460
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x29
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x35
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x163
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x813
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x1810
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x4946
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x8864
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x280
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x2327
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x2762
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x4129
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x8872
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x12725
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x16299
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x476
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x489
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x270
1866J
Jackets and Packets
dp
2800
x175
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x447
1866H
Happy Sets
combinatorics
2100
x1172
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1090
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x77
1866E
Elevators of Tamem
dp
2700
x162
1866D
Digital Wallet
dp
,
greedy
2300
x850
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x2224
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x5164
1866A
Ambitious Kid
math
800
x11172
1864I
Future Dominators
graphs
,
greedy
3500
x56
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x171
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x210
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1077
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2150
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x5363
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x10449
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x12796
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x17783
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x38
1863H
Goldberg Machine 3
dp
,
trees
3500
x45
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x391
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x794
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2229
1863D
Two-Colored Dominoes
constructive algorithms
,
greedy
1400
x7168
1863C
MEX Repetition
implementation
,
math
1100
x11231
1863B
Split Sort
greedy
,
math
,
sortings
1100
x12187
1863A
Channel
greedy
,
implementation
800
x15306
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2038
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