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Codeforces Round (Div. 2)
5 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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Problems
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Status
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Custom test
Problems
#
Name
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2263
523C
Name Quest
*special problem
,
greedy
1400
x2470
523B
Mean Requests
*special problem
,
implementation
1500
x944
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2602
522D
Closest Equals
*special problem
,
data structures
2000
x3011
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8745
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15881
470H
Array Sorting
*special problem
2300
x187
470G
Hamming Distance
*special problem
2300
x94
470F
Pairwise Sums
*special problem
2300
x100
470E
Chessboard
*special problem
1900
x195
470D
Caesar Cipher
*special problem
1900
x150
470C
Eval
*special problem
1900
x237
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x255
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x668
411A
Password Check
*special problem
,
implementation
800
x7107
409I
Feed the Golorp
*special problem
2400
x118
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8749
409G
On a plane
*special problem
,
geometry
2200
x506
409F
000001
*special problem
1900
x2053
409E
Dome
*special problem
1800
x564
409D
Big Data
*special problem
1700
x1699
409C
Magnum Opus
*special problem
1700
x1954
409B
Mysterious Language
*special problem
1700
x1347
409A
The Great Game
*special problem
1700
x2443
345G
Suffix Subgroup
*special problem
,
strings
2200
x53
345F
Superstitions Inspection
*special problem
2700
x45
345E
Black Cat Rush
*special problem
2700
x45
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x77
345C
Counting Fridays
*special problem
2000
x124
345B
Triskaidekaphobia
*special problem
2100
x123
345A
Expecting Trouble
*special problem
,
probabilities
1500
x478
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1284
291D
Parallel Programming
*special problem
,
greedy
1600
x1468
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1669
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3018
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x6020
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x130
290E
HQ
*special problem
,
constructive algorithms
2500
x198
290D
Orange
*special problem
,
implementation
1400
x1788
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1526
290B
QR code
*special problem
,
implementation
1500
x2415
290A
Mysterious strings
*special problem
,
implementation
1400
x2968
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x246
188G
Array Sorting
*special problem
,
implementation
1600
x329
188F
Binary Notation
*special problem
,
implementation
1400
x291
188E
HQ9+
*special problem
,
implementation
1400
x494
188D
Asterisks
*special problem
,
implementation
1100
x662
188C
LCM
*special problem
,
implementation
,
math
1400
x436
188B
A + Reverse B
*special problem
,
implementation
1300
x713
188A
Hexagonal Numbers
*special problem
1100
x769
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x269
172D
Calendar Reform
*special problem
,
number theory
1500
x1385
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1132
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2697
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5973
171H
A polyline
*special problem
,
implementation
1700
x272
171G
Mysterious numbers - 2
*special problem
1600
x906
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1260
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1430
171D
Broken checker
*special problem
,
brute force
1300
x2544
171C
A Piece of Cake
*special problem
,
implementation
2000
x1066
171B
Star
*special problem
,
combinatorics
1300
x3984
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4395
162J
Brackets
*special problem
1800
x91
162I
Truncatable primes
*special problem
2000
x75
162H
Alternating case
*special problem
1800
x215
162G
Non-decimal sum
*special problem
2000
x59
162F
Factorial zeros
*special problem
1800
x197
162E
HQ9+
*special problem
1800
x175
162D
Remove digits
*special problem
1900
x226
162C
Prime factorization
*special problem
1800
x776
162B
Binary notation
*special problem
1800
x309
162A
Pentagonal numbers
*special problem
,
implementation
1100
x797
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x994
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4275
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2940
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3713
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2464
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1453
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6197
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8993
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x83935
158A
Next Round
*special problem
,
implementation
800
x237561
153E
Euclidean Distance
*special problem
2100
x75
153D
Date Change
*special problem
2000
x82
153C
Caesar Cipher
*special problem
2200
x370
153B
Binary notation
*special problem
1800
x154
153A
A + B
*special problem
1600
x766
130J
Date calculation
*special problem
1800
x327
130I
Array sorting
*special problem
,
sortings
2300
x166
130H
Balanced brackets
*special problem
1600
x542
130G
CAPS LOCK ON
*special problem
1700
x275
130F
Prime factorization
*special problem
1600
x275
130E
Tribonacci numbers
*special problem
1600
x294
130D
Exponentiation
*special problem
1500
x388
130C
Decimal sum
*special problem
1500
x489
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x521
130A
Hexagonal numbers
*special problem
,
implementation
900
x1565
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x61
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