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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
24:28:10
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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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Custom test
Problems
#
Name
257E
Greedy Elevator
data structures
,
implementation
2200
x299
257D
Sum
greedy
,
math
1900
x1635
257C
View Angle
brute force
,
geometry
,
math
1800
x4407
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x7154
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6521
256E
Lucky Arrays
data structures
2400
x670
256D
Liars and Serge
dp
2700
x258
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x876
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x2019
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4749
255B
Code Parsing
implementation
1200
x5010
255A
Greg's Workout
implementation
800
x29111
254E
Dormitory
dp
,
implementation
2100
x678
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x571
254C
Anagram
greedy
,
strings
1800
x1503
254B
Jury Size
brute force
,
implementation
1500
x2162
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x7141
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x538
253D
Table with Letters - 2
brute force
,
two pointers
2000
x851
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2646
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10877
253A
Boys and Girls
greedy
1100
x11331
252B
Unsorting Array
brute force
,
sortings
1800
x1725
252A
Little Xor
brute force
,
implementation
1100
x5368
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x172
251D
Two Sets
bitmasks
,
math
2700
x482
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1048
251B
Playing with Permutations
implementation
,
math
1800
x1280
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x18070
250E
Mad Joe
brute force
2000
x469
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x897
250C
Movie Critics
greedy
1600
x2015
250B
Restoring IPv6
implementation
,
strings
1500
x2005
250A
Paper Work
greedy
1000
x4169
249E
Endless Matrix
math
2600
x328
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x470
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x593
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x502
248C
Robo-Footballer
binary search
,
geometry
2000
x856
248B
Chilly Willy
math
,
number theory
1400
x5376
248A
Cupboards
implementation
800
x22722
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x3452
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9524
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2647
246B
Increase and Decrease
greedy
,
math
1300
x11399
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9342
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6923
245G
Suggested Friends
brute force
,
graphs
2200
x461
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x897
245E
Mishap in Club
greedy
,
implementation
1400
x3307
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2336
245C
Game with Coins
greedy
1700
x1554
245B
Internet Address
implementation
,
strings
1100
x5251
245A
System Administrator
implementation
800
x8524
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4534
244A
Dividing Orange
implementation
900
x7990
243E
Matrix
data structures
3000
x192
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x222
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x530
243B
Hydra
graphs
,
sortings
2000
x1244
243A
The Brand New Function
bitmasks
1600
x3967
242E
XOR on Segment
bitmasks
,
data structures
2000
x9590
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1886
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8851
242B
Big Segment
implementation
,
sortings
1100
x15929
242A
Heads or Tails
brute force
,
implementation
1100
x6411
241G
Challenging Balloons
constructive algorithms
1900
x550
241F
Race
brute force
,
implementation
2300
x265
241E
Flights
graphs
,
shortest paths
2600
x1119
241D
Numbers
2900
x382
241C
Mirror Box
geometry
,
implementation
2000
x512
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x837
241A
Old Peykan
greedy
1300
x2253
240F
TorCoder
data structures
2600
x1984
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x357
239B
Easy Tape Programming
brute force
,
implementation
1500
x1377
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x19116
238E
Meeting Her
dp
,
graphs
,
shortest paths
2600
x400
238D
Tape Programming
data structures
,
implementation
2900
x253
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1251
238B
Boring Partition
constructive algorithms
1800
x1336
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2054
237E
Build String
flows
,
graphs
2000
x1765
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x570
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5889
237B
Young Table
implementation
,
sortings
1500
x2246
237A
Free Cash
implementation
1000
x27131
236B
Easy Number Challenge
implementation
,
number theory
1300
x14522
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x219043
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x780
235D
Graph Game
graphs
3000
x509
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2165
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x3616
235A
LCM Challenge
number theory
1600
x18084
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x573
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1485
234F
Fence
dp
1800
x1781
234E
Champions' League
implementation
1600
x1002
234D
Cinema
implementation
1600
x1541
234C
Weather
dp
,
implementation
1300
x5591
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