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Before contest
Codeforces Round 941 (Div. 1)
12:38:35
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Before contest
Codeforces Round 941 (Div. 2)
12:38:35
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data structures
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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Name
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
x207
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
x260
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x225
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x17743
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x11938
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x22282
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1575
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x620
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11399
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x738
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x462
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x604
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3469
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x54
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x531
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2354
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x7992
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x123
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x403
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1054
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2369
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x381
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1146
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7029
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3311
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13423
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x242
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6323
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1605
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x206
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3696
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1477
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3687
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18056
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9801
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2254
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3113
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5786
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5144
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1109
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3407
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19840
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x394
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x867
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x730
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2007
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3573
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16683
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4205
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21939
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1643
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19220
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2086
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x11438
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18239
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1209
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x286
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2676
1912G
Great City Saint Petersburg
data structures
2400
x415
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1844
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x77
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x58
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x9873
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x23033
1906F
Maximize The Value
data structures
,
sortings
2100
x922
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x442
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3458
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x303
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x803
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3753
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10470
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x550
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x886
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3711
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3633
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x254
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2887
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2028
1896E
Permutation Sorting
data structures
,
sortings
2100
x1991
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5138
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x168
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1449
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5529
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x811
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3345
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x68
1889C2
Doremy's Drying Plan (Hard Version)
data structures
,
dp
2600
x876
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x2986
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x802
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1560
1886F
Diamond Theft
data structures
,
greedy
3300
x158
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3306
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5392
1883F
You Are So Beautiful
data structures
1400
x8143
1883D
In Love
data structures
,
greedy
1500
x9864
1881G
Anya and the Mysterious String
binary search
,
data structures
2000
x2146
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x470
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1086
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x10919
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