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Codeforces Round 973 (Div. 2)
03:11:22
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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
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3103
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2375
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x3704
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3651
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4076
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4608
2000G
Call During the Journey
binary search
,
brute force
,
graphs
,
greedy
,
shortest paths
2100
x2029
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x4920
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x2980
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x5723
1996F
Bomb
binary search
,
greedy
,
math
1900
x4334
1994E
Wooden Game
bitmasks
,
greedy
,
math
,
trees
2000
x4203
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
1900
x5413
1992G
Ultra-Meow
combinatorics
,
dp
,
math
2000
x2899
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5457
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x3960
1991D
Prime XOR Coloring
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
1900
x6107
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5673
1988D
The Omnipotent Monster Killer
brute force
,
dfs and similar
,
dp
,
trees
2000
x4654
1987E
Wonderful Tree!
brute force
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2000
x3210
1986F
Non-academic Problem
dfs and similar
,
graphs
,
trees
1900
x4325
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x3114
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3599
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3617
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6507
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x4145
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x2191
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x4074
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3452
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1720
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1271
1970E2
Trails (Medium)
dp
,
matrices
2000
x1186
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x570
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1432
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x749
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x1061
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4381
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4101
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x188
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x240
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4357
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3797
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4360
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3548
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x5315
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4221
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1641
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2910
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4607
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x4107
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3757
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2730
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3420
1938J
There and Back Again
2100
x1259
1938C
Bit Counting Sequence
1900
x1435
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2816
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3438
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2447
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x4015
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2757
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2582
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4673
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x4180
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4275
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3464
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3566
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2497
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3722
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5607
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3790
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2652
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5503
1919H
Tree Diameter
interactive
,
trees
2000
x142
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3823
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4699
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1819
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x4031
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x3088
1912D
Divisibility Test
math
1900
x1437
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x1007
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x2043
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x174
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x198
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x118
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x4350
1906J
Count BFS Graph
combinatorics
,
dp
2100
x750
1906F
Maximize The Value
data structures
,
sortings
2100
x1088
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x1502
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3787
1903E
Geo Game
greedy
,
interactive
,
math
2000
x1994
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x4238
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x4091
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x2050
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x4134
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x3173
1898D
Absolute Beauty
greedy
,
math
1900
x5189
1896E
Permutation Sorting
data structures
,
sortings
2100
x2203
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5983
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2626
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3691
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