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Problems
#
Name
1972B
Coin Games
games
x12286
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
x13985
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
x133
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
x248
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
x468
1970F3
Playing Quidditch (Hard)
implementation
x177
1970F2
Playing Quidditch (Medium)
implementation
x179
1970F1
Playing Quidditch (Easy)
implementation
x243
1970E3
Trails (Hard)
dp
,
matrices
x269
1970E2
Trails (Medium)
dp
,
matrices
x435
1970E1
Trails (Easy)
dp
x584
1970D3
Arithmancy (Hard)
interactive
x26
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
x84
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
x307
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
x490
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
x733
1970C1
Game on Tree (Easy)
games
x939
1970B3
Exact Neighbours (Hard)
constructive algorithms
x231
1970B2
Exact Neighbours (Medium)
constructive algorithms
x345
1970B1
Exact Neighbours (Easy)
constructive algorithms
x469
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
x229
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
implementation
,
trees
x240
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
x1343
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
x83
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
x724
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
x2731
1969C
Minimizing the Sum
dp
,
implementation
x5164
1969B
Shifts and Sorting
constructive algorithms
,
greedy
x12577
1969A
Two Friends
constructive algorithms
,
implementation
,
math
x14276
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
x979
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
x2344
1968F
Equal XOR Segments
binary search
,
data structures
x2741
1968E
Cells Arrangement
constructive algorithms
x5991
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
x9351
1968C
Assembly via Remainders
constructive algorithms
,
number theory
x15960
1968B
Prefiquence
greedy
,
two pointers
x19772
1968A
Maximize?
brute force
,
math
,
number theory
x22971
1967F
Next and Prev
brute force
,
data structures
,
implementation
x18
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
x37
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
x93
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
x326
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
x1059
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
x2580
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
x8358
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
x7688
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x10216
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x13228
1965F
Conference
data structures
,
flows
3300
x58
1965E
Connected Cubes
constructive algorithms
,
games
3100
x153
1965D
Missing Subarray Sum
constructive algorithms
2900
x230
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1285
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x4453
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x8954
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x249
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x307
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x931
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3362
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7105
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14239
1957A
Stickogon
constructive algorithms
,
greedy
800
x19045
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
x629
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1163
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3052
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10269
1956B
Nene and the Card Game
games
,
greedy
800
x18345
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18431
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x973
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3311
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5708
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6933
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12497
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17328
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23309
1955A
Yogurt Sale
math
800
x35674
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x194
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1697
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4722
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x15174
1954B
Make It Ugly
implementation
,
math
1200
x14960
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19881
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x685
1952I
Dark Matter
bitmasks
,
geometry
x338
1952H
Palindrome
implementation
,
strings
x348
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x915
1952F
Grid
brute force
x1632
1952E
Sweep Line
combinatorics
,
games
,
math
x206
1952D
Are You a Procrastinator?
implementation
x4119
1952C
They Have Fooled
brute force
,
schedules
x2704
1952B
Is it stated?
strings
x10245
1952A
Are You a Robot, Again?
strings
x11314
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x40
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x192
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x242
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x638
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2947
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4609
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9371
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11745
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x16121
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data structures
dfs and similar
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expression parsing
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graph matchings
graphs
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