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Refact.ai Match 1 (Codeforces Round 985)
12:47:31
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combine-tags-by-or
*combine tags by OR
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
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x582
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1346
1970F3
Playing Quidditch (Hard)
implementation
2300
x358
1970F2
Playing Quidditch (Medium)
implementation
2300
x346
1970F1
Playing Quidditch (Easy)
implementation
2300
x426
1970E3
Trails (Hard)
dp
,
matrices
2200
x739
1970E2
Trails (Medium)
dp
,
matrices
2000
x1289
1970E1
Trails (Easy)
dp
1800
x2200
1970D3
Arithmancy (Hard)
interactive
3100
x109
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x206
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x623
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1577
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2744
1970C1
Game on Tree (Easy)
games
1400
x3472
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x486
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x809
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x1142
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x462
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x442
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x4692
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x273
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1373
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4585
1969C
Minimizing the Sum
dp
,
implementation
1700
x8761
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x19043
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x19943
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1960
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4252
1968F
Equal XOR Segments
binary search
,
data structures
1800
x5506
1968E
Cells Arrangement
constructive algorithms
1600
x10422
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14933
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x24995
1968B
Prefiquence
greedy
,
two pointers
800
x27889
1968A
Maximize?
brute force
,
math
,
number theory
800
x34547
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x67
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x103
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x215
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x650
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1770
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3933
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x13289
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x12492
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x14984
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x17874
1965F
Conference
data structures
,
flows
3300
x176
1965E
Connected Cubes
constructive algorithms
,
games
3100
x259
1965D
Missing Subarray Sum
constructive algorithms
2900
x428
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1935
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6713
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x13738
1958J
Necromancer
*special problem
3200
x31
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x32
1958H
Composite Spells
*special problem
,
dp
2600
x77
1958G
Observation Towers
*special problem
2400
x108
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x191
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x254
1958D
Staircase
*special problem
1600
x526
1958C
Firewood
*special problem
1500
x720
1958B
Clock in the Pool
*special problem
,
math
1400
x895
1958A
1-3-5
*special problem
,
dp
1100
x1958
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x439
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x496
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1268
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4489
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x9681
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17947
1957A
Stickogon
constructive algorithms
,
greedy
800
x23333
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x360
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x881
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1463
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3928
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12907
1956B
Nene and the Card Game
games
,
greedy
800
x21244
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x21687
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1260
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4547
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x7120
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8653
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x15498
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x21294
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x27956
1955A
Yogurt Sale
math
800
x43572
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x252
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2304
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x6200
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x19462
1954B
Make It Ugly
implementation
,
math
1200
x18610
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x24191
1953A
Accuracy-Preserving Summation Algorithm
*special problem
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x773
1952I
Dark Matter
bitmasks
,
geometry
x538
1952H
Palindrome
implementation
,
strings
x698
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x1030
1952F
Grid
brute force
x1747
1952E
Sweep Line
combinatorics
,
games
,
math
x258
1952D
Are You a Procrastinator?
implementation
x4598
1952C
They Have Fooled
brute force
,
schedules
x2907
1952B
Is it stated?
strings
x11152
1952A
Are You a Robot, Again?
strings
x12451
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x76
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