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Before contest
Educational Codeforces Round 167 (Rated for Div. 2)
20:04:15
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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
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Problems
#
Name
6A
Triangle
brute force
,
geometry
900
x19315
5E
Bindian Signalizing
data structures
2400
x2038
5D
Follow Traffic Rules
implementation
,
math
2100
x1663
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x13070
5B
Center Alignment
implementation
,
strings
1200
x5726
5A
Chat Servers Outgoing Traffic
implementation
1000
x9485
4D
Mysterious Present
dp
,
sortings
1700
x9953
4C
Registration System
data structures
,
hashing
,
implementation
1300
x79112
4B
Before an Exam
constructive algorithms
,
greedy
1200
x24050
4A
Watermelon
brute force
,
math
800
x492230
3D
Least Cost Bracket Sequence
greedy
2600
x3184
3C
Tic-tac-toe
brute force
,
games
,
implementation
1800
x7115
3B
Lorry
greedy
,
sortings
1900
x4419
3A
Shortest path of the king
greedy
,
shortest paths
1000
x18760
2C
Commentator problem
geometry
2600
x1726
2B
The least round way
dp
,
math
2000
x10516
2A
Winner
hashing
,
implementation
1500
x25480
1C
Ancient Berland Circus
geometry
,
math
2100
x5579
1B
Spreadsheet
implementation
,
math
1600
x21973
1A
Theatre Square
math
1000
x250146
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