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11 days
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Codeforces Round 944 (Div. 4)
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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
x13363
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x15121
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
x147
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
x272
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
x531
1970F3
Playing Quidditch (Hard)
implementation
x198
1970F2
Playing Quidditch (Medium)
implementation
x206
1970F1
Playing Quidditch (Easy)
implementation
x273
1970E3
Trails (Hard)
dp
,
matrices
x306
1970E2
Trails (Medium)
dp
,
matrices
x487
1970E1
Trails (Easy)
dp
x664
1970D3
Arithmancy (Hard)
interactive
x39
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
x98
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
x333
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
x569
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
x837
1970C1
Game on Tree (Easy)
games
x1062
1970B3
Exact Neighbours (Hard)
constructive algorithms
x255
1970B2
Exact Neighbours (Medium)
constructive algorithms
x388
1970B1
Exact Neighbours (Easy)
constructive algorithms
x533
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
x276
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
x284
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
x1564
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x99
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x821
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x2991
1969C
Minimizing the Sum
dp
,
implementation
1700
x5558
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x13224
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x14846
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1200
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x2758
1968F
Equal XOR Segments
binary search
,
data structures
1800
x3338
1968E
Cells Arrangement
constructive algorithms
1600
x6842
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x10368
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x17436
1968B
Prefiquence
greedy
,
two pointers
800
x21169
1968A
Maximize?
brute force
,
math
,
number theory
800
x24768
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x22
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x46
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x111
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x374
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1155
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x2769
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x8896
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x8232
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x10798
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x13781
1965F
Conference
data structures
,
flows
3300
x66
1965E
Connected Cubes
constructive algorithms
,
games
3100
x158
1965D
Missing Subarray Sum
constructive algorithms
2900
x244
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1350
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x4726
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x9526
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x273
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x331
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x972
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3499
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7358
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14591
1957A
Stickogon
constructive algorithms
,
greedy
800
x19502
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x251
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x643
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1187
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3121
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10464
1956B
Nene and the Card Game
games
,
greedy
800
x18600
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18665
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1000
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3406
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5824
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7054
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12693
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17597
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23591
1955A
Yogurt Sale
math
800
x36117
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x200
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1758
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4821
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x15473
1954B
Make It Ugly
implementation
,
math
1200
x15246
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x20172
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x688
1952I
Dark Matter
bitmasks
,
geometry
x344
1952H
Palindrome
implementation
,
strings
x349
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x919
1952F
Grid
brute force
x1636
1952E
Sweep Line
combinatorics
,
games
,
math
x207
1952D
Are You a Procrastinator?
implementation
x4135
1952C
They Have Fooled
brute force
,
schedules
x2711
1952B
Is it stated?
strings
x10276
1952A
Are You a Robot, Again?
strings
x11343
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x42
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x195
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x250
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x647
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2988
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4656
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9514
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11918
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x16317
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