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Name
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
x2339
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
x1956
1974E
Money Buys Happiness
dp
x4329
1974D
Ingenuity-2
constructive algorithms
,
implementation
x9580
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
x10153
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
x22830
1974A
Phone Desktop
greedy
,
math
x24680
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x94
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x470
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1292
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x5797
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x10227
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x18267
1972B
Coin Games
games
900
x16895
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x18715
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1147
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x6559
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x7048
1971E
Find the Car
binary search
,
math
,
sortings
1500
x10034
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x19879
1971C
Clock and Strings
implementation
900
x24919
1971B
Different String
implementation
,
strings
800
x28323
1971A
My First Sorting Problem
implementation
,
sortings
800
x34106
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x194
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x352
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x770
1970F3
Playing Quidditch (Hard)
implementation
2300
x269
1970F2
Playing Quidditch (Medium)
implementation
2300
x261
1970F1
Playing Quidditch (Easy)
implementation
2300
x330
1970E3
Trails (Hard)
dp
,
matrices
2200
x404
1970E2
Trails (Medium)
dp
,
matrices
2000
x705
1970E1
Trails (Easy)
dp
1800
x1057
1970D3
Arithmancy (Hard)
interactive
3100
x65
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x132
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x419
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x826
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1330
1970C1
Game on Tree (Easy)
games
1400
x1717
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x324
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x499
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x692
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x342
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x347
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2408
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x124
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x983
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3452
1969C
Minimizing the Sum
dp
,
implementation
1700
x6354
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x14833
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x16406
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1426
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3239
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4102
1968E
Cells Arrangement
constructive algorithms
1600
x8157
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x12033
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x20146
1968B
Prefiquence
greedy
,
two pointers
800
x23773
1968A
Maximize?
brute force
,
math
,
number theory
800
x28026
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x35
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x59
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x126
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x461
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1333
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3192
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10330
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9652
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x12062
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x15055
1965F
Conference
data structures
,
flows
3300
x83
1965E
Connected Cubes
constructive algorithms
,
games
3100
x182
1965D
Missing Subarray Sum
constructive algorithms
2900
x280
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1470
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5252
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x10701
1958J
Necromancer
*special problem
3200
x11
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x18
1958H
Composite Spells
*special problem
,
dp
2600
x63
1958G
Observation Towers
*special problem
2400
x90
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x147
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x201
1958D
Staircase
*special problem
1600
x347
1958C
Firewood
*special problem
1500
x468
1958B
Clock in the Pool
*special problem
,
math
1400
x637
1958A
1-3-5
*special problem
,
dp
1100
x1029
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x292
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x352
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1028
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3745
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7873
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15391
1957A
Stickogon
constructive algorithms
,
greedy
800
x20438
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x267
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x694
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1254
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3318
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10960
1956B
Nene and the Card Game
games
,
greedy
800
x19184
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x19355
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1050
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3584
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2-sat
binary search
bitmasks
brute force
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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
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number theory
probabilities
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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