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Problems
#
Name
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
x236
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
x4137
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
greedy
,
math
,
two pointers
x8181
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
x15253
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x6423
1971E
Find the Car
binary search
,
math
,
sortings
1500
x9235
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3329
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x15934
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1371
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x11546
1968A
Maximize?
brute force
,
math
,
number theory
800
x26996
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x54
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x119
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1270
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3075
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x9974
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9323
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x10401
1958B
Clock in the Pool
*special problem
,
math
1400
x604
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1012
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3662
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7718
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x682
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1235
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3249
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10813
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3515
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5955
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x18012
1955A
Yogurt Sale
math
800
x36853
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x206
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1814
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4948
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x15950
1954B
Make It Ugly
implementation
,
math
1200
x15681
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x20655
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x929
1952E
Sweep Line
combinatorics
,
games
,
math
x210
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x256
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3042
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4727
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9711
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x16607
1950C
Clock Conversion
implementation
,
math
800
x35327
1949K
Make Triangle
constructive algorithms
,
math
2800
x236
1949H
Division Avoidance
greedy
,
math
3100
x74
1949E
Damage per Second
brute force
,
math
2900
x83
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1156
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2121
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x18066
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x499
1945B
Fireworks
math
,
number theory
900
x19847
1945A
Setting up Camp
greedy
,
math
800
x24843
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x21348
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1260
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3326
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x371
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x563
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5511
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9600
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12327
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x15635
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26567
1941A
Rudolf and the Ticket
brute force
,
math
800
x39099
1937A
Shuffle Party
implementation
,
math
800
x21554
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x96
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2466
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6606
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1175
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7368
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6075
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16770
1934A
Too Min Too Max
greedy
,
math
800
x23501
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x873
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x9779
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17925
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20613
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30052
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35575
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x888
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6865
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13780
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2462
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13436
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15955
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x26220
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x991
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13702
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1635
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1518
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4196
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13338
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23862
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x29016
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x211
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1559
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3769
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7527
1928A
Rectangle Cutting
geometry
,
math
800
x21255
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1498
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