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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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Problems
#
Name
1980F2
Field Division (hard version)
math
,
sortings
2400
x1072
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3931
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x11158
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x15127
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x348
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1565
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6955
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1410
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x4047
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x11991
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x737
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1994
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x7075
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x649
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x1127
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x4878
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x10946
1975I
Mind Bloom
dp
3500
x130
1975H
378QAQ and Core
greedy
,
strings
3500
x191
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x311
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x892
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x2468
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x6424
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x4635
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3753
1974E
Money Buys Happiness
dp
1800
x8665
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x15689
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x16637
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x259
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x860
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x2005
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x8836
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x2019
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x9853
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x10795
1971E
Find the Car
binary search
,
math
,
sortings
1500
x15451
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x390
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x660
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1468
1970F3
Playing Quidditch (Hard)
implementation
2300
x381
1970F2
Playing Quidditch (Medium)
implementation
2300
x366
1970F1
Playing Quidditch (Easy)
implementation
2300
x448
1970E3
Trails (Hard)
dp
,
matrices
2200
x834
1970E2
Trails (Medium)
dp
,
matrices
2000
x1478
1970E1
Trails (Easy)
dp
1800
x2534
1970D3
Arithmancy (Hard)
interactive
3100
x125
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x235
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x720
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1762
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x3155
1970C1
Game on Tree (Easy)
games
1400
x3899
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x537
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x894
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x1274
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x530
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x491
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x313
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1530
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4922
1969C
Minimizing the Sum
dp
,
implementation
1700
x9481
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x2093
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4514
1968F
Equal XOR Segments
binary search
,
data structures
1800
x5878
1968E
Cells Arrangement
constructive algorithms
1600
x11080
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x75
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x127
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x239
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x723
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1878
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x4122
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x14083
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x13279
1965F
Conference
data structures
,
flows
3300
x214
1965E
Connected Cubes
constructive algorithms
,
games
3100
x326
1965D
Missing Subarray Sum
constructive algorithms
2900
x458
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x2064
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x7145
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x14619
1958J
Necromancer
*special problem
3200
x36
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x37
1958H
Composite Spells
*special problem
,
dp
2600
x81
1958G
Observation Towers
*special problem
2400
x113
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x211
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x284
1958D
Staircase
*special problem
1600
x572
1958C
Firewood
*special problem
1500
x801
1958B
Clock in the Pool
*special problem
,
math
1400
x1000
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x482
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x541
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1359
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4777
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x10297
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x400
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x928
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1514
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x4144
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x13681
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1327
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4864
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x7519
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