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Before contest
Codeforces Round 977 (Div. 2)
2 days
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→ Filter Problems
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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
298B
Sail
brute force
,
greedy
,
implementation
1200
x14113
298A
Snow Footprints
greedy
,
implementation
1300
x10919
296A
Yaroslav and Permutations
greedy
,
math
1100
x23095
292B
Network Topology
graphs
,
implementation
1200
x8210
292A
SMSC
implementation
1100
x2696
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3031
289A
Polo the Penguin and Segments
brute force
,
implementation
1100
x9230
288A
Polo the Penguin and Strings
greedy
1300
x6491
287A
IQ Test
brute force
,
implementation
1100
x19755
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x23205
285B
Find Marble
implementation
1200
x15013
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x13336
276B
Little Girl and Game
games
,
greedy
1300
x28479
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x13023
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x45295
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10755
262B
Roma and Changing Signs
greedy
1200
x11350
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13939
258A
Little Elephant and Bits
greedy
,
math
1100
x22887
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x7050
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6476
255B
Code Parsing
implementation
1200
x4964
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x7041
253A
Boys and Girls
greedy
1100
x11236
252A
Little Xor
brute force
,
implementation
1100
x5280
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x17592
246B
Increase and Decrease
greedy
,
math
1300
x11277
245B
Internet Address
implementation
,
strings
1100
x5219
242B
Big Segment
implementation
,
sortings
1100
x15696
242A
Heads or Tails
brute force
,
implementation
1100
x6374
241A
Old Peykan
greedy
1300
x2231
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x18830
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2036
236B
Easy Number Challenge
implementation
,
number theory
1300
x14186
234C
Weather
dp
,
implementation
1300
x5523
234A
Lefthanders and Righthanders
implementation
1200
x4432
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x74905
227B
Effective Approach
implementation
1100
x27927
227A
Where do I Turn?
geometry
1300
x4182
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11680
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x26613
222B
Cosmic Tables
data structures
,
implementation
1300
x6101
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10745
221B
Little Elephant and Numbers
implementation
1300
x4564
220A
Little Elephant and Problem
implementation
,
sortings
1300
x11981
218B
Airport
implementation
1100
x16400
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9427
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x21124
216A
Tiling with Hexagons
implementation
,
math
1200
x4998
215B
Olympic Medal
greedy
,
math
1300
x5566
208D
Prizes, Prizes, more Prizes
implementation
1200
x7585
203B
Game on Paper
brute force
,
implementation
1300
x2591
203A
Two Problems
brute force
,
implementation
1200
x4175
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5395
195B
After Training
data structures
,
implementation
,
math
1300
x5196
194B
Square
math
1200
x3515
192B
Walking in the Rain
brute force
,
implementation
1100
x6252
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10373
190A
Vasya and the Bus
greedy
,
math
1100
x5857
189B
Counting Rhombi
brute force
,
math
1300
x3941
189A
Cut Ribbon
brute force
,
dp
1300
x66537
188D
Asterisks
*special problem
,
implementation
1100
x680
188B
A + Reverse B
*special problem
,
implementation
1300
x731
188A
Hexagonal Numbers
*special problem
1100
x775
186B
Growing Mushrooms
greedy
,
sortings
1200
x5571
186A
Comparing Strings
implementation
,
strings
1100
x16849
185A
Plant
math
1300
x5896
181B
Number of Triplets
binary search
,
brute force
1300
x3009
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2508
178A3
Educational Game
greedy
1100
x1437
177D1
Encrypting Messages
brute force
1200
x2157
177B2
Rectangular Game
number theory
1200
x2984
176A
Trading Business
greedy
,
sortings
1200
x1463
174A
Problem About Equation
math
1100
x2804
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2290
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2775
171D
Broken checker
*special problem
,
brute force
1300
x2567
171B
Star
*special problem
,
combinatorics
1300
x4045
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4442
169B
Replacing Digits
greedy
1100
x3276
166A
Rank List
binary search
,
implementation
,
sortings
1100
x17616
162A
Pentagonal numbers
*special problem
,
implementation
1100
x803
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4890
160B
Unlucky Ticket
greedy
,
sortings
1100
x13958
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3783
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6241
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x86420
155B
Combination
greedy
,
sortings
1100
x10182
152B
Steps
binary search
,
implementation
1300
x6681
151B
Phone Numbers
implementation
,
strings
1200
x6377
147A
Punctuation
implementation
,
strings
1300
x3629
146B
Lucky Mask
brute force
,
implementation
1300
x4364
145A
Lucky Conversion
greedy
,
implementation
1200
x7142
144B
Meeting
implementation
1300
x5244
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4985
136B
Ternary Logic
implementation
,
math
1100
x4859
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7534
134A
Average Numbers
brute force
,
implementation
1200
x3955
133B
Unary
implementation
1200
x8803
132A
Turing Tape
implementation
1300
x2774
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