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Codeforces Round 973 (Div. 2)
13:35:57
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Difficulty:
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constructive algorithms
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
Standings
Custom test
Problems
#
Name
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x31053
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x82
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x5736
2005A
Simple Palindrome
combinatorics
,
constructive algorithms
,
greedy
x18160
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x16693
2002B
Removals Game
constructive algorithms
,
games
1000
x17254
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x18521
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4598
2001B
Generate Permutation
constructive algorithms
800
x23006
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x29945
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x5710
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x22345
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x22978
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x20550
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x19688
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x7876
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x490
1994F
Stardew Valley
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x1093
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
1900
x5409
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15867
1994A
Diverse Game
constructive algorithms
,
greedy
,
implementation
800
x19592
1993F1
Dyn-scripted Robot (Easy Version)
brute force
,
chinese remainder theorem
,
constructive algorithms
,
math
,
number theory
2400
x913
1993E
Xor-Grid Problem
bitmasks
,
constructive algorithms
,
dp
,
implementation
2700
x468
1993B
Parity and Sum
constructive algorithms
,
greedy
1100
x21650
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x8738
1992C
Gorilla and Permutation
constructive algorithms
,
math
900
x27928
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x39322
1991I
Grid Game
constructive algorithms
,
games
,
graph matchings
,
greedy
,
interactive
3500
x59
1991G
Grid Reset
constructive algorithms
,
greedy
,
implementation
2700
x520
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x3958
1991D
Prime XOR Coloring
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
1900
x6104
1991C
Absolute Zero
constructive algorithms
,
greedy
,
math
1300
x13605
1991B
AND Reconstruction
bitmasks
,
constructive algorithms
,
greedy
1100
x15646
1990B
Array Craft
constructive algorithms
,
greedy
1200
x15660
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x15721
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x249
1984A
Strange Splitting
constructive algorithms
800
x20547
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x7864
1983B
Corner Twist
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15549
1983A
Array Divisibility
constructive algorithms
,
math
800
x24930
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1554
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x5090
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10055
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x17998
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x302
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1384
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6360
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x18163
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x14377
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x24915
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x642
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x17222
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x14319
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x8074
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x198
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x569
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x455
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x749
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x1061
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x433
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x419
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x18437
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x19567
1968E
Cells Arrangement
constructive algorithms
1600
x10086
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x24261
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x14644
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x17511
1965E
Connected Cubes
constructive algorithms
,
games
3100
x247
1965D
Missing Subarray Sum
constructive algorithms
2900
x403
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1853
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6477
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x240
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17567
1957A
Stickogon
constructive algorithms
,
greedy
800
x22905
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x338
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3795
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12584
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1213
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x27204
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x23563
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x769
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x75
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x751
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3547
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x5314
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x19246
1949K
Make Triangle
constructive algorithms
,
math
2800
x296
1949D
Funny or Scary?
constructive algorithms
2600
x375
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2908
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16408
1948A
Special Characters
brute force
,
constructive algorithms
800
x28220
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4604
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x733
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7912
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x15934
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2040
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x13672
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x17050
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3417
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x142
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