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Codeforces Round 946 (Div. 3)
00:26:56
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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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Problems
#
Name
1973F
Maximum GCD Sum Queries
brute force
,
dp
,
implementation
,
number theory
x69
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
x375
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
x1104
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
x5422
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
x9856
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
x17646
1972B
Coin Games
games
900
x16503
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x18303
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1064
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x6259
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x6773
1971E
Find the Car
binary search
,
math
,
sortings
1500
x9672
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x19384
1971C
Clock and Strings
implementation
900
x24327
1971B
Different String
implementation
,
strings
800
x27668
1971A
My First Sorting Problem
implementation
,
sortings
800
x33304
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x185
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x336
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x726
1970F3
Playing Quidditch (Hard)
implementation
2300
x238
1970F2
Playing Quidditch (Medium)
implementation
2300
x245
1970F1
Playing Quidditch (Easy)
implementation
2300
x317
1970E3
Trails (Hard)
dp
,
matrices
2200
x386
1970E2
Trails (Medium)
dp
,
matrices
2000
x672
1970E1
Trails (Easy)
dp
1800
x987
1970D3
Arithmancy (Hard)
interactive
3100
x61
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x128
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x409
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x787
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1256
1970C1
Game on Tree (Easy)
games
1400
x1609
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x314
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x488
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x668
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x332
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x339
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2271
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x114
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x954
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3380
1969C
Minimizing the Sum
dp
,
implementation
1700
x6224
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x14586
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x16139
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1394
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3179
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4001
1968E
Cells Arrangement
constructive algorithms
1600
x7990
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x11844
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x19836
1968B
Prefiquence
greedy
,
two pointers
800
x23519
1968A
Maximize?
brute force
,
math
,
number theory
800
x27658
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x34
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x56
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x120
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x446
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1296
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3116
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10135
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9478
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x11881
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x14863
1965F
Conference
data structures
,
flows
3300
x76
1965E
Connected Cubes
constructive algorithms
,
games
3100
x178
1965D
Missing Subarray Sum
constructive algorithms
2900
x271
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1448
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5178
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x10542
1958J
Necromancer
*special problem
3200
x10
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x17
1958H
Composite Spells
*special problem
,
dp
2600
x60
1958G
Observation Towers
*special problem
2400
x87
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x146
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x196
1958D
Staircase
*special problem
1600
x334
1958C
Firewood
*special problem
1500
x453
1958B
Clock in the Pool
*special problem
,
math
1400
x619
1958A
1-3-5
*special problem
,
dp
1100
x995
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x289
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x350
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1018
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3702
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7787
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15264
1957A
Stickogon
constructive algorithms
,
greedy
800
x20271
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x266
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x685
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1244
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3280
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10872
1956B
Nene and the Card Game
games
,
greedy
800
x19065
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x19226
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1043
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3543
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5982
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7290
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13017
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x18170
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x24164
1955A
Yogurt Sale
math
800
x37177
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x211
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