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Problems
#
Name
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1548
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1251
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x440
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x528
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2682
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2492
1938J
There and Back Again
2100
x1128
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3139
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2245
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2401
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2310
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2409
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3635
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1699
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2766
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x946
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x179
1906J
Count BFS Graph
combinatorics
,
dp
2100
x654
1906F
Maximize The Value
data structures
,
sortings
2100
x948
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1858
1896E
Permutation Sorting
data structures
,
sortings
2100
x2048
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3364
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2888
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2163
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2293
1866H
Happy Sets
combinatorics
2100
x1542
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1535
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2481
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2639
1856D
More Wrong
divide and conquer
,
interactive
2100
x3123
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2194
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3099
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2814
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2270
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1935
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1745
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2996
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2187
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2073
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2304
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3171
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2198
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2579
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1965
1775E
The Human Equation
greedy
,
implementation
2100
x3053
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2615
1767C
Count Binary Strings
data structures
,
dp
2100
x2534
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3315
1761D
Carry Bit
combinatorics
,
math
2100
x2353
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2685
1734E
Rectangular Congruence
constructive algorithms
,
number theory
2100
x2809
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2474
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2073
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x942
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2367
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3062
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2656
1667B
Optimal Partition
data structures
,
dp
2100
x3498
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1295
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2614
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2792
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2348
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3199
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3030
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3807
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3982
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3673
1606E
Arena
combinatorics
,
dp
,
math
2100
x3362
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2847
1599H
Hidden Fortress
interactive
,
math
2100
x1016
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2251
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2364
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1288
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4223
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3878
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3249
1551D2
Domino (hard version)
constructive algorithms
,
implementation
,
math
2100
x2671
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2887
1538G
Gift Set
binary search
,
greedy
,
math
,
ternary search
2100
x4389
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2819
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2906
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1974
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4118
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2471
1510G
Guide
2100
x1260
1510D
Digits
dp
,
math
,
number theory
2100
x1805
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5519
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4770
1486D
Max Median
binary search
,
data structures
,
dp
2100
x6806
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2972
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3928
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4437
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2950
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2802
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3827
1450C1
Errich-Tac-Toe (Easy Version)
constructive algorithms
,
math
2100
x5332
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3409
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x4150
1433F
Zero Remainder Sum
dp
2100
x5866
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x139
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36:34:17
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→ Filter Problems
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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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