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Problems
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Name
1973F
Maximum GCD Sum Queries
brute force
,
dp
,
implementation
,
number theory
x57
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
x5043
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
x16900
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x6609
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x19099
1971C
Clock and Strings
implementation
900
x23992
1971B
Different String
implementation
,
strings
800
x27298
1971A
My First Sorting Problem
implementation
,
sortings
800
x32877
1970F3
Playing Quidditch (Hard)
implementation
2300
x237
1970F2
Playing Quidditch (Medium)
implementation
2300
x244
1970F1
Playing Quidditch (Easy)
implementation
2300
x315
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2210
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x113
1969C
Minimizing the Sum
dp
,
implementation
1700
x6184
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x16047
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x33
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x439
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9414
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x11816
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15208
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x683
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1237
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3263
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3535
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7264
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x18091
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x24065
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1820
1954B
Make It Ugly
implementation
,
math
1200
x15728
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x697
1952H
Palindrome
implementation
,
strings
x357
1952D
Are You a Procrastinator?
implementation
x4189
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3051
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3548
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7708
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12146
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x20541
1950C
Clock Conversion
implementation
,
math
800
x35378
1950B
Upscaling
implementation
800
x33810
1950A
Stair, Peak, or Neither?
implementation
800
x44478
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x320
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2647
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20600
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4077
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9229
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23714
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x631
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3333
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x565
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2452
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16718
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x174
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x13208
1937A
Shuffle Party
implementation
,
math
800
x21576
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1107
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2469
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x398
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7378
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x9794
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20641
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30093
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6875
1932D
Card Game
greedy
,
implementation
1400
x9983
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13803
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x26936
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2379
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x211
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3830
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2980
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1506
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10158
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x23410
1926B
Vlad and Shapes
geometry
,
implementation
800
x29980
1926A
Vlad and the Best of Five
implementation
800
x42456
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2291
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x333
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16275
1923A
Moving Chips
greedy
,
implementation
800
x23346
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5248
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16951
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25916
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1132
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3470
1921B
Arranging Cats
greedy
,
implementation
800
x32084
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5129
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x778
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x777
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1566
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4297
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12636
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22216
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28833
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1667
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9445
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16757
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24610
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5460
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x27870
1915C
Can I Square?
binary search
,
implementation
800
x37849
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38783
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