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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
2014D
Robert Hood and Mrs Hood
brute force
,
data structures
,
greedy
,
sortings
1400
x9475
2014C
Robin Hood in Town
binary search
,
greedy
,
math
1100
x17336
2013C
Password Cracking
constructive algorithms
,
interactive
,
strings
1400
x9898
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x6042
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
1400
x11672
2009D
Satyam and Counting
geometry
,
math
1400
x12767
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x23033
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x11454
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8765
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x17791
2007C
Dora and C++
math
,
number theory
1500
x11047
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
1200
x15205
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x22095
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x10450
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x17097
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x14266
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x10175
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x12535
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x21624
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x9572
1999F
Expected Median
combinatorics
,
math
1500
x9706
1999E
Triple Operations
dp
,
implementation
,
math
1300
x17486
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x25555
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x11823
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x21067
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x19874
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x15092
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x21868
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x17198
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x16012
1993C
Light Switches
implementation
,
math
1400
x13030
1993B
Parity and Sum
constructive algorithms
,
greedy
1100
x21897
1992D
Test of Love
dp
,
greedy
,
implementation
1200
x19740
1991C
Absolute Zero
constructive algorithms
,
greedy
,
math
1300
x13797
1991B
AND Reconstruction
bitmasks
,
constructive algorithms
,
greedy
1100
x15765
1990C
Mad MAD Sum
brute force
,
greedy
,
math
1500
x11032
1990B
Array Craft
constructive algorithms
,
greedy
1200
x15859
1989C
Two Movies
greedy
,
math
1400
x17831
1989B
Substring and Subsequence
brute force
,
greedy
,
strings
1200
x19529
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x15902
1987C
Basil's Garden
dp
,
greedy
1200
x16798
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x14783
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x22318
1985F
Final Boss
binary search
,
data structures
1500
x14706
1985E
Secret Box
brute force
,
combinatorics
,
math
1200
x19421
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x16045
1984B
Large Addition
implementation
,
math
1100
x17798
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x12114
1983B
Corner Twist
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15670
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x16899
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x16476
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x13341
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x13903
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x18117
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x18304
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x14501
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x17303
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x21818
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x14180
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x14432
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x15397
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13678
1971E
Find the Car
binary search
,
math
,
sortings
1500
x13838
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25361
1970C1
Game on Tree (Easy)
games
1400
x3227
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14582
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12978
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x12202
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x14719
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x13377
1958C
Firewood
*special problem
1500
x678
1958B
Clock in the Pool
*special problem
,
math
1400
x867
1958A
1-3-5
*special problem
,
dp
1100
x1870
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17663
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x15048
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x20818
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x19042
1954B
Make It Ugly
implementation
,
math
1200
x18227
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x11433
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x14320
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x14142
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x22856
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3070
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16501
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x22654
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x20144
1945D
Seraphim the Owl
dp
,
greedy
1300
x14194
1945C
Left and Right Houses
brute force
1200
x14696
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x16005
1943A
MEX Game 1
games
,
greedy
1300
x17591
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x10798
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x13727
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x18201
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x14828
1935B
Informatics in MAC
constructive algorithms
1200
x18302
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x18620
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x11058
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x19975
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22413
1932D
Card Game
greedy
,
implementation
1400
x11296
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