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June 18, 19:00 (UTC)
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June 19, 3:00 AM (UTC)
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Problems
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Name
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1761
1970C1
Game on Tree (Easy)
games
1400
x2286
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x362
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x565
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x812
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x373
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x372
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x3260
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x169
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1092
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3815
1969C
Minimizing the Sum
dp
,
implementation
1700
x7075
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x16395
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x17955
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1614
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3584
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4604
1968E
Cells Arrangement
constructive algorithms
1600
x8946
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x13049
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x21869
1968B
Prefiquence
greedy
,
two pointers
800
x25319
1968A
Maximize?
brute force
,
math
,
number theory
800
x30050
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x47
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x80
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x161
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x519
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1432
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3428
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x11416
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x10611
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x13167
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x16119
1965F
Conference
data structures
,
flows
3300
x121
1965E
Connected Cubes
constructive algorithms
,
games
3100
x203
1965D
Missing Subarray Sum
constructive algorithms
2900
x309
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1587
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5715
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x11606
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
x217
1958D
Staircase
*special problem
1600
x397
1958C
Firewood
*special problem
1500
x541
1958B
Clock in the Pool
*special problem
,
math
1400
x706
1958A
1-3-5
*special problem
,
dp
1100
x1242
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
x382
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
x3951
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x8397
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x16221
1957A
Stickogon
constructive algorithms
,
greedy
800
x21415
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
x3465
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x11545
1956B
Nene and the Card Game
games
,
greedy
800
x19893
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x20051
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
x3836
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6287
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7666
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13694
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x19045
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x25237
1955A
Yogurt Sale
math
800
x38921
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x226
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1940
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5315
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x17214
1954B
Make It Ugly
implementation
,
math
1200
x16676
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x21798
1953A
Accuracy-Preserving Summation Algorithm
*special problem
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x717
1952I
Dark Matter
bitmasks
,
geometry
x396
1952H
Palindrome
implementation
,
strings
x370
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x964
1952F
Grid
brute force
x1679
1952E
Sweep Line
combinatorics
,
games
,
math
x219
1952D
Are You a Procrastinator?
implementation
x4293
1952C
They Have Fooled
brute force
,
schedules
x2774
1952B
Is it stated?
strings
x10500
1952A
Are You a Robot, Again?
strings
x11622
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
x3222
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4987
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x10401
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x13085
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x17828
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3778
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8091
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12870
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x21347
←
1
2
3
4
...
96
97
→
→ 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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