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Problems
#
Name
1973F
Maximum GCD Sum Queries
brute force
,
dp
,
implementation
,
number theory
x50
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
x293
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
x922
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
x4740
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
x8956
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
x16344
1972B
Coin Games
games
900
x16229
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x18015
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1022
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x6018
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x6527
1971E
Find the Car
binary search
,
math
,
sortings
1500
x9383
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x18926
1971C
Clock and Strings
implementation
900
x23782
1971B
Different String
implementation
,
strings
800
x27053
1971A
My First Sorting Problem
implementation
,
sortings
800
x32628
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x183
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x327
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x694
1970F3
Playing Quidditch (Hard)
implementation
2300
x234
1970F2
Playing Quidditch (Medium)
implementation
2300
x241
1970F1
Playing Quidditch (Easy)
implementation
2300
x312
1970E3
Trails (Hard)
dp
,
matrices
2200
x379
1970E2
Trails (Medium)
dp
,
matrices
2000
x652
1970E1
Trails (Easy)
dp
1800
x948
1970D3
Arithmancy (Hard)
interactive
3100
x60
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x126
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x398
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x755
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1197
1970C1
Game on Tree (Easy)
games
1400
x1539
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x307
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x474
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x649
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x326
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x333
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2170
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x113
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x941
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3342
1969C
Minimizing the Sum
dp
,
implementation
1700
x6157
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x14431
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x15994
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1375
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3136
1968F
Equal XOR Segments
binary search
,
data structures
1800
x3921
1968E
Cells Arrangement
constructive algorithms
1600
x7801
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x11614
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x19432
1968B
Prefiquence
greedy
,
two pointers
800
x23091
1968A
Maximize?
brute force
,
math
,
number theory
800
x27153
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x32
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x54
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x119
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x436
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1279
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3090
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10018
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9363
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x11779
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x14766
1965F
Conference
data structures
,
flows
3300
x75
1965E
Connected Cubes
constructive algorithms
,
games
3100
x173
1965D
Missing Subarray Sum
constructive algorithms
2900
x269
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1437
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5142
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x10441
1958J
Necromancer
*special problem
3200
x10
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x15
1958H
Composite Spells
*special problem
,
dp
2600
x60
1958G
Observation Towers
*special problem
2400
x86
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x145
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x195
1958D
Staircase
*special problem
1600
x329
1958C
Firewood
*special problem
1500
x444
1958B
Clock in the Pool
*special problem
,
math
1400
x606
1958A
1-3-5
*special problem
,
dp
1100
x964
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x285
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x346
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1014
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3675
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7738
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15172
1957A
Stickogon
constructive algorithms
,
greedy
800
x20170
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x265
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x682
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1236
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3258
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10827
1956B
Nene and the Card Game
games
,
greedy
800
x19012
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x19164
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1034
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3522
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5960
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7257
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12945
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x18042
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x24015
1955A
Yogurt Sale
math
800
x36933
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x208
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