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Codeforces Round 945 (Div. 2)
3 days
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→ Filter Problems
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
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Status
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Custom test
Problems
#
Name
1972B
Coin Games
games
900
x14788
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x16519
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x795
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x4793
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x5334
1971E
Find the Car
binary search
,
math
,
sortings
1500
x7788
1971D
Binary Cut
greedy
,
implementation
,
sortings
,
strings
1100
x16782
1971C
Clock and Strings
implementation
900
x21359
1971B
Different String
implementation
,
strings
800
x24601
1971A
My First Sorting Problem
implementation
,
sortings
800
x29780
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x162
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x296
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x621
1970F3
Playing Quidditch (Hard)
implementation
2300
x215
1970F2
Playing Quidditch (Medium)
implementation
2300
x223
1970F1
Playing Quidditch (Easy)
implementation
2300
x293
1970E3
Trails (Hard)
dp
,
matrices
2200
x350
1970E2
Trails (Medium)
dp
,
matrices
2000
x574
1970E1
Trails (Easy)
dp
1800
x807
1970D3
Arithmancy (Hard)
interactive
3100
x44
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x103
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x359
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x665
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1023
1970C1
Game on Tree (Easy)
games
1400
x1320
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x277
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x434
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x598
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x303
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x310
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x1878
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x105
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x905
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3198
1969C
Minimizing the Sum
dp
,
implementation
1700
x5891
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x13879
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x15487
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1318
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x2978
1968F
Equal XOR Segments
binary search
,
data structures
1800
x3688
1968E
Cells Arrangement
constructive algorithms
1600
x7396
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x11076
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x18569
1968B
Prefiquence
greedy
,
two pointers
800
x22265
1968A
Maximize?
brute force
,
math
,
number theory
800
x26101
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x27
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x51
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x116
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x413
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1226
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x2929
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x9474
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x8805
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x11249
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x14223
1965F
Conference
data structures
,
flows
3300
x72
1965E
Connected Cubes
constructive algorithms
,
games
3100
x169
1965D
Missing Subarray Sum
constructive algorithms
2900
x256
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1396
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x4919
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x9958
1958J
Necromancer
*special problem
3200
x5
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x8
1958H
Composite Spells
*special problem
,
dp
2600
x47
1958G
Observation Towers
*special problem
2400
x78
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x129
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x178
1958D
Staircase
*special problem
1600
x296
1958C
Firewood
*special problem
1500
x404
1958B
Clock in the Pool
*special problem
,
math
1400
x540
1958A
1-3-5
*special problem
,
dp
1100
x810
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x280
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x340
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x992
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3590
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7557
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14871
1957A
Stickogon
constructive algorithms
,
greedy
800
x19831
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x260
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x657
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1205
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3202
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10645
1956B
Nene and the Card Game
games
,
greedy
800
x18800
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18945
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1013
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3458
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5895
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7157
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12816
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17820
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23808
1955A
Yogurt Sale
math
800
x36533
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x204
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1791
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4897
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x15732
1954B
Make It Ugly
implementation
,
math
1200
x15471
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x20449
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x692
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