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ICPC Challenge
→ Pay attention
Before contest
Codeforces Round 914 (Div. 2)
43:02:14
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Difficulty:
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constructive algorithms
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
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x901
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x6171
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1100
x10556
1906L
Palindromic Parentheses
constructive algorithms
2500
x234
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x672
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x206
1903C
Theofanis' Nightmare
constructive algorithms
,
greedy
1400
x6414
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x7427
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x7677
1902A
Binary Imbalance
constructive algorithms
800
x14559
1901C
Add, Divide and Floor
constructive algorithms
,
greedy
,
math
1400
x7754
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x13699
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x4984
1898C
Colorful Grid
constructive algorithms
1700
x3692
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x136
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x464
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x6192
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x4683
1894B
Two Out of Three
constructive algorithms
1000
x11914
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x686
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x6702
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x8814
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x16544
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x14866
1890A
Doremy's Paint 3
constructive algorithms
800
x16014
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x5701
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x10110
1887F
Minimum Segments
constructive algorithms
3400
x88
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x193
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1271
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1159
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x22131
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x233
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x847
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x12583
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1082
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x18994
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x27263
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x176
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x1903
1873G
ABBC or BACB
constructive algorithms
,
greedy
1500
x9595
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x17556
1869A
Make It Zero
constructive algorithms
900
x15424
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x59
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x215
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2088
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x5782
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x10029
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x352
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x2699
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3187
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x4782
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x9701
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x14260
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x18040
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x225
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x5860
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x11426
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x13740
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x18889
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x57
1863D
Two-Colored Dominoes
constructive algorithms
,
greedy
1400
x7982
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x8480
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x14522
1862B
Sequence Game
constructive algorithms
800
x24997
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x18189
1861A
Prime Deletion
constructive algorithms
,
math
800
x21823
1860A
Not a Substring
constructive algorithms
,
strings
900
x19371
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x21276
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x26045
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x20384
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x346
1854A2
Dual (Hard Version)
constructive algorithms
,
math
1900
x6193
1854A1
Dual (Easy Version)
constructive algorithms
,
math
1400
x12307
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x135
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x398
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x3697
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x27219
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x6974
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2547
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x16871
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x16529
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x21988
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x571
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x346
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x699
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1607
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x10767
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x16503
1844A
Subtraction Game
constructive algorithms
,
games
800
x22891
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3664
1841A
Game with Board
constructive algorithms
,
games
800
x23358
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x814
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2086
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1018
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x10470
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x266
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x12275
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x14972
1838A
Blackboard List
constructive algorithms
,
math
800
x20208
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