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Name
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3574
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4590
1968E
Cells Arrangement
constructive algorithms
1600
x8929
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x13026
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x21834
1968B
Prefiquence
greedy
,
two pointers
800
x25294
1968A
Maximize?
brute force
,
math
,
number theory
800
x30015
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x46
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x79
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x160
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x518
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1430
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3422
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x11397
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x10591
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x13148
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x16105
1965F
Conference
data structures
,
flows
3300
x120
1965E
Connected Cubes
constructive algorithms
,
games
3100
x202
1965D
Missing Subarray Sum
constructive algorithms
2900
x307
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1586
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5701
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x11587
1958J
Necromancer
*special problem
3200
x19
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x25
1958H
Composite Spells
*special problem
,
dp
2600
x67
1958G
Observation Towers
*special problem
2400
x95
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x161
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x216
1958D
Staircase
*special problem
1600
x396
1958C
Firewood
*special problem
1500
x539
1958B
Clock in the Pool
*special problem
,
math
1400
x703
1958A
1-3-5
*special problem
,
dp
1100
x1236
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x324
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x381
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1080
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3946
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x8385
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x16209
1957A
Stickogon
constructive algorithms
,
greedy
800
x21399
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x297
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x730
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1310
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3460
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x11524
1956B
Nene and the Card Game
games
,
greedy
800
x19876
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x20034
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1105
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3833
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6282
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7658
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13681
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x19026
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x25217
1955A
Yogurt Sale
math
800
x38882
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x226
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1939
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5311
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x17197
1954B
Make It Ugly
implementation
,
math
1200
x16660
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x21782
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x70
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x226
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x284
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x688
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3219
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4984
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x10395
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x13071
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x17819
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3774
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8086
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12862
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x21335
1950C
Clock Conversion
implementation
,
math
800
x36605
1950B
Upscaling
implementation
800
x34948
1950A
Stair, Peak, or Neither?
implementation
800
x46366
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
x1350
1949H
Division Avoidance
greedy
,
math
3100
x78
1949G
Scooter
graphs
,
greedy
2300
x672
1949F
Dating
greedy
,
sortings
,
trees
2200
x818
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
x1370
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x2321
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x91
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x649
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1185
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2721
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8530
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x15144
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x21186
1948A
Special Characters
brute force
,
constructive algorithms
800
x27050
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x812
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2204
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4233
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9597
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x18752
←
1
2
3
4
...
93
94
→
→ Pay attention
Before contest
Codeforces Round 954 (Div. 3)
5 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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