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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
24:35:07
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Difficulty:
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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
1902A
Binary Imbalance
constructive algorithms
800
x21414
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x155
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1594
1901D
Yet Another Monster Fight
binary search
,
dp
,
greedy
,
implementation
,
math
1700
x7205
1901C
Add, Divide and Floor
constructive algorithms
,
greedy
,
math
1400
x12290
1901B
Chip and Ribbon
greedy
,
math
1100
x15251
1901A
Line Trip
greedy
,
math
800
x35182
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x295
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x2144
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x4370
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x11848
1900B
Laura and Operations
dp
,
math
900
x17909
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x30282
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x3335
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x7940
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x15907
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x13807
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x22174
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x21580
1899A
Game with Integers
games
,
math
,
number theory
800
x49487
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x828
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2353
1898D
Absolute Beauty
greedy
,
math
1900
x5392
1898C
Colorful Grid
constructive algorithms
1700
x5677
1898B
Milena and Admirer
greedy
,
math
1500
x12288
1898A
Milica and String
brute force
,
implementation
,
strings
800
x16222
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x107
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x94
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x349
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x752
1896E
Permutation Sorting
data structures
,
sortings
2100
x2273
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5936
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x9913
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x15258
1896A
Jagged Swaps
sortings
800
x26292
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x198
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x784
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1597
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x6187
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x11483
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x20623
1895A
Treasure Chest
math
800
x24635
1894B
Two Out of Three
constructive algorithms
1000
x16250
1894A
Secret Sport
implementation
,
strings
800
x19148
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x199
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x938
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2769
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x9102
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x12664
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3920
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x861
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x4038
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x13910
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x18861
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x19417
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x17712
1890A
Doremy's Paint 3
constructive algorithms
800
x28699
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x85
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x114
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x635
1889C2
Doremy's Drying Plan (Hard Version)
data structures
,
dp
2600
x1037
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3375
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x7548
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x13492
1887F
Minimum Segments
constructive algorithms
3400
x182
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x388
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x990
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1814
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x3122
1886F
Diamond Theft
data structures
,
greedy
3300
x192
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1533
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3659
1886C
Decreasing String
implementation
,
strings
1600
x11941
1886B
Fear of the Dark
binary search
,
geometry
,
math
1200
x16457
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x26124
1885A
Deterministic Scheduling for Extended Reality over 5G and Beyond
*special problem
1884E
Hard Design
greedy
,
implementation
,
math
2800
x323
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x3329
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x6265
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12903
1884A
Simple Design
brute force
,
greedy
,
math
800
x17663
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x5559
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x11692
1883F
You Are So Beautiful
data structures
1400
x9861
1883E
Look Back
bitmasks
,
greedy
1700
x8385
1883D
In Love
data structures
,
greedy
1500
x12025
1883C
Raspberries
dp
,
math
1000
x29267
1883B
Chemistry
strings
900
x34434
1883A
Morning
math
800
x26131
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x301
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x1044
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5650
1882C
Card Game
brute force
,
greedy
1500
x12663
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x15709
1882A
Increasing Sequence
greedy
800
x25603
1881G
Anya and the Mysterious String
binary search
,
data structures
2000
x2448
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x7224
1881E
Block Sequence
dp
1500
x15157
1881D
Divide and Equalize
math
,
number theory
1300
x18154
1881C
Perfect Square
brute force
,
implementation
1200
x17365
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