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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
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
362A
Two Semiknights Meet
greedy
,
math
1500
x2663
361B
Levko and Permutation
constructive algorithms
,
math
,
number theory
1200
x8034
361A
Levko and Table
constructive algorithms
,
implementation
800
x16663
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x702
360D
Levko and Sets
number theory
2600
x405
360C
Levko and Strings
combinatorics
,
dp
2500
x1107
360B
Levko and Array
binary search
,
dp
2000
x2920
360A
Levko and Array Recovery
greedy
,
implementation
1700
x2055
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x468
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x5075
359C
Prime Number
math
,
number theory
1900
x3032
359B
Permutation
constructive algorithms
,
dp
,
math
1400
x7961
359A
Table
constructive algorithms
,
greedy
,
implementation
1000
x8536
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x394
358D
Dima and Hares
dp
,
greedy
1800
x4018
358C
Dima and Containers
constructive algorithms
,
greedy
,
implementation
2000
x2016
358B
Dima and Text Messages
brute force
,
strings
1500
x3722
358A
Dima and Continuous Line
brute force
,
implementation
1400
x7744
357B
Flag Day
constructive algorithms
,
implementation
1400
x8182
357A
Group of Students
brute force
,
greedy
,
implementation
1000
x6838
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x408
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x955
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1265
356B
Xenia and Hamming
implementation
,
math
1900
x1923
356A
Knight Tournament
data structures
,
dsu
1500
x13545
355B
Vasya and Public Transport
greedy
,
implementation
1100
x4499
355A
Vasya and Digital Root
constructive algorithms
,
implementation
1100
x9414
354E
Lucky Number Representation
constructive algorithms
,
dfs and similar
,
dp
2200
x877
354D
Transferring Pyramid
dp
2900
x464
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x3055
354B
Game with Strings
bitmasks
,
dp
,
games
2400
x457
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5473
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x583
353D
Queue
constructive algorithms
,
dp
2000
x2878
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4825
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2282
353A
Domino
implementation
,
math
1200
x18492
352B
Jeff and Periods
implementation
,
sortings
1300
x16420
352A
Jeff and Digits
brute force
,
implementation
,
math
1000
x25647
351E
Jeff and Permutation
greedy
2200
x1590
351D
Jeff and Removing Periods
data structures
2700
x1056
351C
Jeff and Brackets
dp
,
matrices
2500
x557
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2380
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2920
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x773
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x266
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6543
350B
Resort
graphs
1500
x3182
350A
TL
brute force
,
greedy
,
implementation
1200
x16374
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13954
349A
Cinema Line
greedy
,
implementation
1100
x29929
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x443
348D
Turtles
dp
,
matrices
2500
x1716
348C
Subset Sums
brute force
,
data structures
2500
x2187
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2093
348A
Mafia
binary search
,
math
,
sortings
1600
x13033
347B
Fixed Points
brute force
,
implementation
,
math
1100
x9295
347A
Difference Row
constructive algorithms
,
implementation
,
sortings
1300
x8959
346E
Doodle Jump
math
,
number theory
3000
x264
346D
Robot Control
dp
,
graphs
,
shortest paths
2600
x748
346C
Number Transformation II
greedy
,
math
2200
x1433
346B
Lucky Common Subsequence
dp
,
strings
2000
x3527
346A
Alice and Bob
games
,
math
,
number theory
1600
x8682
345G
Suffix Subgroup
*special problem
,
strings
2200
x55
345F
Superstitions Inspection
*special problem
2700
x47
345E
Black Cat Rush
*special problem
2700
x47
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x79
345C
Counting Fridays
*special problem
2000
x126
345B
Triskaidekaphobia
*special problem
2100
x125
345A
Expecting Trouble
*special problem
,
probabilities
1500
x485
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8842
344A
Magnets
implementation
800
x119859
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x760
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5763
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x3005
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13804
343A
Rational Resistance
math
,
number theory
1600
x8734
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x8368
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x497
342C
Cupboard and Balloons
geometry
1900
x1850
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x4021
342A
Xenia and Divisors
greedy
,
implementation
1200
x12524
341E
Candies Game
constructive algorithms
,
greedy
3000
x451
341D
Iahub and Xors
data structures
2500
x1229
340E
Iahub and Permutations
combinatorics
,
math
2000
x2465
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x7172
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4223
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2073
340A
The Wall
math
1200
x7628
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x548
339D
Xenia and Bit Operations
data structures
,
trees
1700
x25570
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8305
339B
Xenia and Ringroad
implementation
1000
x69617
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x212882
338E
Optimize!
data structures
2600
x983
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1157
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1019
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x6091
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4895
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9340
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