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Codeforces Round 940 (Div. 2)
3 days
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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
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Custom test
Problems
#
Name
470D
Caesar Cipher
*special problem
1900
x144
470C
Eval
*special problem
1900
x230
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x250
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x662
411A
Password Check
*special problem
,
implementation
800
x6942
409I
Feed the Golorp
*special problem
2400
x114
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8616
409G
On a plane
*special problem
,
geometry
2200
x498
409F
000001
*special problem
1900
x2033
409E
Dome
*special problem
1800
x560
409D
Big Data
*special problem
1700
x1689
409C
Magnum Opus
*special problem
1700
x1940
409B
Mysterious Language
*special problem
1700
x1338
409A
The Great Game
*special problem
1700
x2431
345G
Suffix Subgroup
*special problem
,
strings
2200
x51
345F
Superstitions Inspection
*special problem
2700
x43
345E
Black Cat Rush
*special problem
2700
x43
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x75
345C
Counting Fridays
*special problem
2000
x121
345B
Triskaidekaphobia
*special problem
2100
x121
345A
Expecting Trouble
*special problem
,
probabilities
1500
x474
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1267
291D
Parallel Programming
*special problem
,
greedy
1600
x1465
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1662
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3010
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x5973
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x125
290E
HQ
*special problem
,
constructive algorithms
2500
x194
290D
Orange
*special problem
,
implementation
1400
x1781
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1513
290B
QR code
*special problem
,
implementation
1500
x2398
290A
Mysterious strings
*special problem
,
implementation
1400
x2939
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x243
188G
Array Sorting
*special problem
,
implementation
1600
x323
188F
Binary Notation
*special problem
,
implementation
1400
x285
188E
HQ9+
*special problem
,
implementation
1400
x489
188D
Asterisks
*special problem
,
implementation
1100
x647
188C
LCM
*special problem
,
implementation
,
math
1400
x433
188B
A + Reverse B
*special problem
,
implementation
1300
x700
188A
Hexagonal Numbers
*special problem
1100
x752
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x266
172D
Calendar Reform
*special problem
,
number theory
1500
x1379
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1127
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2684
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5877
171H
A polyline
*special problem
,
implementation
1700
x264
171G
Mysterious numbers - 2
*special problem
1600
x886
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1241
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1394
171D
Broken checker
*special problem
,
brute force
1300
x2501
171C
A Piece of Cake
*special problem
,
implementation
2000
x1049
171B
Star
*special problem
,
combinatorics
1300
x3929
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4335
162J
Brackets
*special problem
1800
x88
162I
Truncatable primes
*special problem
2000
x71
162H
Alternating case
*special problem
1800
x212
162G
Non-decimal sum
*special problem
2000
x55
162F
Factorial zeros
*special problem
1800
x194
162E
HQ9+
*special problem
1800
x173
162D
Remove digits
*special problem
1900
x223
162C
Prime factorization
*special problem
1800
x756
162B
Binary notation
*special problem
1800
x307
162A
Pentagonal numbers
*special problem
,
implementation
1100
x789
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x986
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4245
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2911
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3664
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2451
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1448
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6167
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8840
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x82000
158A
Next Round
*special problem
,
implementation
800
x230859
153E
Euclidean Distance
*special problem
2100
x72
153D
Date Change
*special problem
2000
x77
153C
Caesar Cipher
*special problem
2200
x356
153B
Binary notation
*special problem
1800
x149
153A
A + B
*special problem
1600
x753
130J
Date calculation
*special problem
1800
x323
130I
Array sorting
*special problem
,
sortings
2300
x163
130H
Balanced brackets
*special problem
1600
x475
130G
CAPS LOCK ON
*special problem
1700
x272
130F
Prime factorization
*special problem
1600
x271
130E
Tribonacci numbers
*special problem
1600
x287
130D
Exponentiation
*special problem
1500
x380
130C
Decimal sum
*special problem
1500
x481
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x514
130A
Hexagonal numbers
*special problem
,
implementation
900
x1517
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x60
100I
Rotation
*special problem
,
geometry
,
math
1500
x337
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x74
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x109
100F
Polynom
*special problem
,
implementation
1800
x132
100E
Lamps in a Line
*special problem
,
math
1600
x265
100D
World of Mouth
*special problem
,
strings
1500
x297
100C
A+B
*special problem
,
implementation
1400
x512
100B
Friendly Numbers
*special problem
,
implementation
1500
x533
100A
Carpeting the Room
*special problem
,
implementation
1100
x882
72I
Goofy Numbers
*special problem
,
implementation
1500
x454
72H
Reverse It!
*special problem
,
implementation
1600
x258
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