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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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Problems
#
Name
1972B
Coin Games
games
900
x13685
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x15414
1971H
±1
2-sat
,
dfs and similar
,
graphs
x358
1971G
XOUR
data structures
,
dsu
,
sortings
x2711
1971F
Circle Perimeter
binary search
,
implementation
x2856
1971E
Find the Car
binary search
,
math
,
sortings
x5582
1971D
Binary Cut
greedy
,
implementation
,
sortings
,
strings
x12840
1971C
Clock and Strings
implementation
x17482
1971B
Different String
implementation
,
strings
x20848
1971A
My First Sorting Problem
implementation
,
sortings
x25895
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x147
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x277
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x542
1970F3
Playing Quidditch (Hard)
implementation
2300
x199
1970F2
Playing Quidditch (Medium)
implementation
2300
x207
1970F1
Playing Quidditch (Easy)
implementation
2300
x277
1970E3
Trails (Hard)
dp
,
matrices
2200
x313
1970E2
Trails (Medium)
dp
,
matrices
2000
x500
1970E1
Trails (Easy)
dp
1800
x680
1970D3
Arithmancy (Hard)
interactive
3100
x39
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x98
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x340
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x581
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x856
1970C1
Game on Tree (Easy)
games
1400
x1088
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x256
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x392
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x542
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x279
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x288
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x1594
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x101
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x836
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3058
1969C
Minimizing the Sum
dp
,
implementation
1700
x5638
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x13370
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x14979
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1237
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x2830
1968F
Equal XOR Segments
binary search
,
data structures
1800
x3438
1968E
Cells Arrangement
constructive algorithms
1600
x7001
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x10574
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x17759
1968B
Prefiquence
greedy
,
two pointers
800
x21479
1968A
Maximize?
brute force
,
math
,
number theory
800
x25142
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x24
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x47
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x113
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x387
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1171
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x2805
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x9040
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x8370
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x10881
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x13865
1965F
Conference
data structures
,
flows
3300
x68
1965E
Connected Cubes
constructive algorithms
,
games
3100
x168
1965D
Missing Subarray Sum
constructive algorithms
2900
x248
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1360
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x4770
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x9618
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x275
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x333
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x977
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3526
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7402
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14656
1957A
Stickogon
constructive algorithms
,
greedy
800
x19567
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x256
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x651
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1194
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3155
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10508
1956B
Nene and the Card Game
games
,
greedy
800
x18642
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18711
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1002
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3416
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5833
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7077
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12712
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17635
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23624
1955A
Yogurt Sale
math
800
x36209
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x202
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1769
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4836
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x15527
1954B
Make It Ugly
implementation
,
math
1200
x15297
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x20222
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x688
1952I
Dark Matter
bitmasks
,
geometry
x344
1952H
Palindrome
implementation
,
strings
x349
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x919
1952F
Grid
brute force
x1637
1952E
Sweep Line
combinatorics
,
games
,
math
x207
1952D
Are You a Procrastinator?
implementation
x4139
1952C
They Have Fooled
brute force
,
schedules
x2711
1952B
Is it stated?
strings
x10281
1952A
Are You a Robot, Again?
strings
x11348
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x43
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