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Before contest
Codeforces Round 945 (Div. 2)
14:13:33
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Difficulty:
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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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Custom test
Problems
#
Name
1972B
Coin Games
games
900
x15656
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x17388
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x940
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x5599
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x6127
1971E
Find the Car
binary search
,
math
,
sortings
1500
x8851
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x18211
1971C
Clock and Strings
implementation
900
x22929
1971B
Different String
implementation
,
strings
800
x26212
1971A
My First Sorting Problem
implementation
,
sortings
800
x31623
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x175
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x314
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x667
1970F3
Playing Quidditch (Hard)
implementation
2300
x227
1970F2
Playing Quidditch (Medium)
implementation
2300
x235
1970F1
Playing Quidditch (Easy)
implementation
2300
x308
1970E3
Trails (Hard)
dp
,
matrices
2200
x368
1970E2
Trails (Medium)
dp
,
matrices
2000
x627
1970E1
Trails (Easy)
dp
1800
x900
1970D3
Arithmancy (Hard)
interactive
3100
x55
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x120
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x387
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x727
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1138
1970C1
Game on Tree (Easy)
games
1400
x1455
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x296
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x460
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x634
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x322
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x329
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2049
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x110
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x931
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3298
1969C
Minimizing the Sum
dp
,
implementation
1700
x6074
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x14213
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x15812
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1357
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3059
1968F
Equal XOR Segments
binary search
,
data structures
1800
x3835
1968E
Cells Arrangement
constructive algorithms
1600
x7642
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x11398
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x19083
1968B
Prefiquence
greedy
,
two pointers
800
x22749
1968A
Maximize?
brute force
,
math
,
number theory
800
x26717
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x28
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
x425
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1257
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3030
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x9818
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9170
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x11532
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x14506
1965F
Conference
data structures
,
flows
3300
x74
1965E
Connected Cubes
constructive algorithms
,
games
3100
x171
1965D
Missing Subarray Sum
constructive algorithms
2900
x261
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1415
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5049
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x10236
1958J
Necromancer
*special problem
3200
x8
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x11
1958H
Composite Spells
*special problem
,
dp
2600
x55
1958G
Observation Towers
*special problem
2400
x81
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x137
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x189
1958D
Staircase
*special problem
1600
x316
1958C
Firewood
*special problem
1500
x433
1958B
Clock in the Pool
*special problem
,
math
1400
x588
1958A
1-3-5
*special problem
,
dp
1100
x921
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x284
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x342
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1008
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3640
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7674
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15060
1957A
Stickogon
constructive algorithms
,
greedy
800
x20053
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x263
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x671
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1222
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3237
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10766
1956B
Nene and the Card Game
games
,
greedy
800
x18935
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x19081
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1028
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3496
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5938
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7217
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12896
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17946
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23933
1955A
Yogurt Sale
math
800
x36739
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x205
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1804
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4933
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x15888
1954B
Make It Ugly
implementation
,
math
1200
x15626
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x20599
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x694
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