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Codeforces Round 1002 (Div. 2)
2 days
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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
427B
Prison Transfer
data structures
,
implementation
1100
x14213
427A
Police Recruits
implementation
800
x81700
426B
Sereja and Mirroring
implementation
1300
x3830
426A
Sereja and Mugs
implementation
800
x9306
425E
Sereja and Sets
dp
2500
x697
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1483
425C
Sereja and Two Sequences
data structures
,
dp
2300
x911
425B
Sereja and Table
bitmasks
,
greedy
2200
x1327
425A
Sereja and Swaps
brute force
,
sortings
1500
x3931
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x138
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x570
424C
Magic Formulas
math
1600
x5550
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7851
424A
Squats
implementation
900
x8587
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x549
421A
Pasha and Hamsters
constructive algorithms
,
implementation
800
x6329
420E
Playing the ball
geometry
2600
x225
420D
Cup Trick
data structures
2200
x865
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1275
420B
Online Meeting
implementation
1800
x1050
420A
Start Up
implementation
1000
x6350
418E
Tricky Password
data structures
3100
x327
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x490
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x857
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2574
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4721
417B
Crash
implementation
1400
x1851
417A
Elimination
dp
,
implementation
,
math
1500
x3074
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1567
416D
Population Size
greedy
,
implementation
,
math
2400
x977
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x8131
416B
Art Union
brute force
,
dp
,
implementation
1300
x8829
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x9064
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6373
415A
Mashmokh and Lights
implementation
900
x9090
414E
Mashmokh's Designed Problem
data structures
3200
x200
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x692
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2248
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x23404
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9900
413E
Maze 2D
data structures
,
divide and conquer
2200
x757
413D
2048
bitmasks
,
dp
2000
x834
413C
Jeopardy!
greedy
,
math
1400
x2403
413B
Spyke Chatting
implementation
1300
x1731
413A
Data Recovery
implementation
1200
x2697
412E
E-mail Addresses
implementation
1900
x853
412D
Giving Awards
dfs and similar
2000
x2103
412C
Pattern
implementation
,
strings
1200
x3963
412B
Network Configuration
greedy
,
sortings
900
x5603
412A
Poster
greedy
,
implementation
900
x4531
411C
Kicker
*special problem
,
implementation
1700
x1234
411B
Multi-core Processor
implementation
1600
x1289
411A
Password Check
*special problem
,
implementation
800
x7373
409I
Feed the Golorp
*special problem
2400
x129
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x9056
409G
On a plane
*special problem
,
geometry
2200
x525
409F
000001
*special problem
1900
x2105
409E
Dome
*special problem
1800
x583
409D
Big Data
*special problem
1700
x1729
409C
Magnum Opus
*special problem
1700
x1994
409B
Mysterious Language
*special problem
1700
x1373
409A
The Great Game
*special problem
1700
x2479
408B
Garland
implementation
1200
x9481
408A
Line to Cashier
implementation
900
x11407
407E
k-d-sequence
data structures
3100
x812
407D
Largest Submatrix 3
dp
,
hashing
2700
x683
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x1062
407B
Long Path
dp
,
implementation
1600
x6651
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4949
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x250
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1191
405E
Graph Cutting
dfs and similar
,
graphs
2300
x1452
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3132
405C
Unusual Product
implementation
,
math
1600
x4712
405B
Domino Effect
1100
x5835
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x105700
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x606
404D
Minesweeper 1D
dp
,
implementation
1900
x2209
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5316
404B
Marathon
implementation
,
math
1500
x2947
404A
Valera and X
implementation
1000
x24477
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x224
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1128
402E
Strictly Positive Matrix
graphs
,
math
2200
x2213
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2645
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x6003
402B
Trees in a Row
brute force
,
implementation
1400
x3838
402A
Nuts
greedy
,
math
1100
x4646
401E
Olympic Games
math
2500
x169
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4253
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x20341
401B
Sereja and Contests
greedy
,
implementation
,
math
1200
x4449
401A
Vanya and Cards
implementation
,
math
800
x16588
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x980
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2947
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2914
400B
Inna and New Matrix of Candies
brute force
,
implementation
,
schedules
1200
x7880
400A
Inna and Choose Options
implementation
1000
x6592
399B
Red and Blue Balls
x1843
399A
Pages
implementation
x4165
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