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Problems
#
Name
1972B
Coin Games
games
,
math
x11625
1972A
Contest Proposal
brute force
,
greedy
x13306
1969F
Card Pairing
dp
,
greedy
,
implementation
x69
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
x658
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
x2555
1969C
Minimizing the Sum
dp
,
implementation
x4883
1969B
Shifts and Sorting
constructive algorithms
,
greedy
x12238
1969A
Two Friends
constructive algorithms
,
implementation
,
math
x13960
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
x542
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
x1606
1968F
Equal XOR Segments
binary search
,
data structures
x1687
1968E
Cells Arrangement
constructive algorithms
x4442
1968D
Permutation Game
dfs and similar
,
games
,
graphs
,
math
x7519
1968C
Assembly via Remainders
constructive algorithms
,
number theory
x13463
1968B
Prefiquence
greedy
,
two pointers
x17387
1968A
Maximize?
brute force
,
math
,
number theory
x20296
1967F
Next and Prev
brute force
,
data structures
,
schedules
x10
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
x32
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
x83
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
two pointers
x288
1967C
Fenwick Tree
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
matrices
,
trees
x971
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
x2348
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
x7909
1967A
Permutation Counting
implementation
,
math
,
sortings
x7223
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x9877
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x12819
1965F
Conference
data structures
,
flows
3300
x54
1965E
Connected Cubes
constructive algorithms
,
games
3100
x146
1965D
Missing Subarray Sum
constructive algorithms
2900
x214
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1231
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x4271
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x8576
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x241
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x299
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x904
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3293
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x6963
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14038
1957A
Stickogon
constructive algorithms
,
greedy
800
x18732
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x243
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x617
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1150
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3011
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10163
1956B
Nene and the Card Game
games
,
greedy
800
x18206
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18297
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x960
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3251
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5657
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6864
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12363
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17137
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23116
1955A
Yogurt Sale
math
800
x35350
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x190
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1670
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4670
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x14983
1954B
Make It Ugly
implementation
,
math
1200
x14830
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19703
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x681
1952I
Dark Matter
bitmasks
,
geometry
x333
1952H
Palindrome
implementation
,
strings
x347
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x911
1952F
Grid
brute force
x1628
1952E
Sweep Line
combinatorics
,
games
,
math
x206
1952D
Are You a Procrastinator?
implementation
x4103
1952C
They Have Fooled
brute force
,
schedules
x2699
1952B
Is it stated?
strings
x10214
1952A
Are You a Robot, Again?
strings
x11279
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x40
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x187
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x239
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x632
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2928
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4584
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9288
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11642
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15993
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3361
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7347
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11573
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19795
1950C
Clock Conversion
implementation
,
math
800
x34217
1950B
Upscaling
implementation
800
x32627
1950A
Stair, Peak, or Neither?
implementation
800
x42694
1949K
Make Triangle
constructive algorithms
,
math
2800
x223
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x306
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1070
1949H
Division Avoidance
greedy
,
math
3100
x68
1949G
Scooter
graphs
,
greedy
2300
x617
1949F
Dating
greedy
,
sortings
,
trees
2200
x708
1949E
Damage per Second
brute force
,
math
2900
x78
1949D
Funny or Scary?
constructive algorithms
2600
x297
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1097
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x1567
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x592
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1107
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2571
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