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Codeforces Round 987 (Div. 2)
00:28:56
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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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Status
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Custom test
Problems
#
Name
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4677
417B
Crash
implementation
1400
x1790
417A
Elimination
dp
,
implementation
,
math
1500
x3020
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1505
416D
Population Size
greedy
,
implementation
,
math
2400
x950
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x8049
416B
Art Union
brute force
,
dp
,
implementation
1300
x8767
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8981
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6322
415A
Mashmokh and Lights
implementation
900
x9016
414E
Mashmokh's Designed Problem
data structures
3200
x200
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x686
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2223
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x22563
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9850
413E
Maze 2D
data structures
,
divide and conquer
2200
x737
413D
2048
bitmasks
,
dp
2000
x822
413C
Jeopardy!
greedy
,
math
1400
x2388
413B
Spyke Chatting
implementation
1300
x1711
413A
Data Recovery
implementation
1200
x2658
412E
E-mail Addresses
implementation
1900
x846
412D
Giving Awards
dfs and similar
2000
x1948
412C
Pattern
implementation
,
strings
1200
x3936
412B
Network Configuration
greedy
,
sortings
900
x5435
412A
Poster
greedy
,
implementation
900
x4467
411C
Kicker
implementation
1700
x1229
411B
Multi-core Processor
implementation
1600
x1280
411A
Password Check
*special problem
,
implementation
800
x7274
409I
Feed the Golorp
*special problem
2400
x127
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8955
409G
On a plane
*special problem
,
geometry
2200
x521
409F
000001
*special problem
1900
x2092
409E
Dome
*special problem
1800
x578
409D
Big Data
*special problem
1700
x1715
409C
Magnum Opus
*special problem
1700
x1981
409B
Mysterious Language
*special problem
1700
x1358
409A
The Great Game
*special problem
1700
x2468
408B
Garland
implementation
1200
x9361
408A
Line to Cashier
implementation
900
x11280
407E
k-d-sequence
data structures
3100
x788
407D
Largest Submatrix 3
dp
,
hashing
2700
x676
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x1008
407B
Long Path
dp
,
implementation
1600
x6593
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4895
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x248
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1180
405E
Graph Cutting
dfs and similar
,
graphs
2300
x1435
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3124
405C
Unusual Product
implementation
,
math
1600
x4676
405B
Domino Effect
1100
x5777
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x102509
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x578
404D
Minesweeper 1D
dp
,
implementation
1900
x2157
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5235
404B
Marathon
implementation
,
math
1500
x2933
404A
Valera and X
implementation
1000
x24062
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x219
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1111
402E
Strictly Positive Matrix
graphs
,
math
2200
x2194
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2621
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5956
402B
Trees in a Row
brute force
,
implementation
1400
x3818
402A
Nuts
greedy
,
math
1100
x4613
401E
Olympic Games
math
2500
x168
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4193
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x20066
401B
Sereja and Contests
greedy
,
implementation
,
math
1200
x4436
401A
Vanya and Cards
implementation
,
math
800
x16318
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x971
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2916
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2901
400B
Inna and New Matrix of Candies
brute force
,
implementation
,
schedules
1200
x7770
400A
Inna and Choose Options
implementation
1000
x6530
389B
Fox and Cross
greedy
,
implementation
1100
x6936
389A
Fox and Number Game
greedy
,
math
1000
x14089
388E
Fox and Meteor Shower
geometry
3100
x122
388D
Fox and Perfect Sets
math
2700
x443
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3420
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2481
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x11503
387E
George and Cards
binary search
,
data structures
2200
x889
387D
George and Interesting Graph
graph matchings
2200
x1021
387C
George and Number
greedy
,
implementation
1700
x2188
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x12269
387A
George and Sleep
implementation
900
x9703
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x443
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x802
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2187
386A
Second-Price Auction
implementation
800
x6439
385E
Bear in the Field
math
,
matrices
2300
x590
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x811
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9705
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9966
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x16516
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3546
384A
Coder
implementation
800
x16330
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x3144
383D
Antimatter
dp
2300
x3033
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6527
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x697
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