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Name
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1067
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x726
1970E2
Trails (Medium)
dp
,
matrices
2000
x675
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x409
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x787
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x488
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x668
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3382
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3181
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x146
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x196
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3702
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3281
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3543
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3056
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4741
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3560
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1251
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2647
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4082
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3621
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3342
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2453
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3005
1938J
There and Back Again
2100
x1120
1938C
Bit Counting Sequence
1900
x1270
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2473
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3101
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2215
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3438
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2467
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2379
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4202
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3777
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3835
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2983
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3258
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2293
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3226
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5250
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3473
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2379
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5132
1919H
Tree Diameter
interactive
,
trees
2000
x130
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3609
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4303
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1681
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3702
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2732
1912D
Divisibility Test
math
1900
x1332
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x935
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1894
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x163
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x175
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x79
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x4004
1906J
Count BFS Graph
combinatorics
,
dp
2100
x641
1906F
Maximize The Value
data structures
,
sortings
2100
x941
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x1314
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3527
1903E
Geo Game
greedy
,
interactive
,
math
2000
x1814
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3788
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3704
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1841
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3738
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2920
1898D
Absolute Beauty
greedy
,
math
1900
x4764
1896E
Permutation Sorting
data structures
,
sortings
2100
x2032
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5598
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2450
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3405
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x3722
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3025
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2700
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3339
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2862
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4898
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5000
1881G
Anya and the Mysterious String
binary search
,
data structures
2000
x2177
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3804
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2143
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x4008
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2281
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3534
1866H
Happy Sets
combinatorics
2100
x1536
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1526
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x2878
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2470
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2621
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2669
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4100
1856D
More Wrong
divide and conquer
,
interactive
2100
x3095
1854A2
Dual (Hard Version)
constructive algorithms
,
math
1900
x6721
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2944
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3608
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4069
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3923
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4147
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2183
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3086
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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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