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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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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Custom test
Problems
#
Name
1250H
Happy Birthday
math
1500
x3962
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x3960
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3950
627A
XOR Equation
dp
,
math
1700
x3941
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3941
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x3936
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3930
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x3928
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3919
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3913
272B
Dima and Sequence
implementation
,
math
1400
x3910
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3903
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3898
226A
Flying Saucer Segments
math
1400
x3890
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x3881
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3865
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3864
1474D
Cleaning
data structures
,
dp
,
greedy
,
math
2200
x3863
189B
Counting Rhombi
brute force
,
math
1300
x3862
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3857
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3854
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3844
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3832
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3820
758C
Unfair Poll
binary search
,
constructive algorithms
,
implementation
,
math
1700
x3817
1696E
Placing Jinas
combinatorics
,
math
2000
x3809
1110E
Magic Stones
constructive algorithms
,
math
,
sortings
2200
x3799
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3794
615D
Multipliers
math
,
number theory
2000
x3777
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3774
813B
The Golden Age
brute force
,
math
1800
x3766
1280B
Beingawesomeism
implementation
,
math
1800
x3747
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x3746
39D
Cubical Planet
math
1100
x3728
1578E
Easy Scheduling
implementation
,
math
1200
x3722
535C
Tavas and Karafs
binary search
,
greedy
,
math
1900
x3702
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3692
1029D
Concatenated Multiples
implementation
,
math
1900
x3689
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3684
903D
Almost Difference
data structures
,
math
2200
x3684
746C
Tram
constructive algorithms
,
implementation
,
math
1600
x3679
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x3676
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3670
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3670
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3669
1107D
Compression
dp
,
implementation
,
math
,
number theory
1800
x3669
926A
2-3-numbers
implementation
,
math
1300
x3665
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3664
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3638
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3637
20B
Equation
math
2000
x3627
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3622
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x3615
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3609
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x3606
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3573
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3572
1060D
Social Circles
greedy
,
math
1900
x3554
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3549
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3547
321A
Ciel and Robot
binary search
,
implementation
,
math
1700
x3547
1467D
Sum of Paths
combinatorics
,
dp
,
math
2200
x3532
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3531
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3510
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3505
1450C2
Errich-Tac-Toe (Hard Version)
constructive algorithms
,
math
2300
x3499
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3492
883M
Quadcopter Competition
greedy
,
math
1100
x3484
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x3482
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3477
269A
Magical Boxes
greedy
,
math
1600
x3467
280C
Game on Tree
implementation
,
math
,
probabilities
,
trees
2200
x3448
630L
Cracking the Code
implementation
,
math
1400
x3440
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3433
622F
The Sum of the k-th Powers
math
2600
x3432
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3431
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3424
917A
The Monster
dp
,
greedy
,
implementation
,
math
1800
x3421
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3414
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3407
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3404
194B
Square
math
1200
x3404
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3403
991E
Bus Number
brute force
,
combinatorics
,
math
1800
x3394
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x3390
1361B
Johnny and Grandmaster
greedy
,
implementation
,
math
,
sortings
1900
x3384
160C
Find Pair
implementation
,
math
,
sortings
1700
x3378
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3376
38B
Chess
brute force
,
implementation
,
math
1200
x3375
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3373
444A
DZY Loves Physics
greedy
,
math
1600
x3362
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3355
62A
A Student's Dream
greedy
,
math
1300
x3353
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3352
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3352
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3343
1515E
Phoenix and Computers
combinatorics
,
dp
,
math
2200
x3343
1216E1
Numerical Sequence (easy version)
binary search
,
brute force
,
math
1900
x3340
645B
Mischievous Mess Makers
greedy
,
math
1200
x3329
55A
Flea travel
implementation
,
math
1200
x3325
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