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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
01:21:43
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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
382A
Ksenia and Pan Scales
greedy
,
implementation
1100
x12528
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x6853
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x68625
380E
Sereja and Dividing
data structures
2600
x308
380D
Sereja and Cinema
combinatorics
,
math
2500
x472
380C
Sereja and Brackets
data structures
,
schedules
2000
x15587
380B
Sereja and Tree
graphs
,
implementation
2400
x540
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2707
379G
New Year Cactus
dp
3100
x142
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2340
379E
New Year Tree Decorations
geometry
,
schedules
,
sortings
2500
x341
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1569
379C
New Year Ratings Change
greedy
,
sortings
1400
x6588
379B
New Year Present
constructive algorithms
,
implementation
1200
x7291
379A
New Year Candles
implementation
1000
x47223
378B
Semifinals
implementation
,
sortings
1300
x5265
378A
Playing with Dice
brute force
800
x24352
377E
Cookie Clicker
dp
,
geometry
2800
x469
377D
Developing Game
data structures
2400
x1189
377C
Captains Mode
bitmasks
,
dp
,
games
2200
x1158
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x2127
377A
Maze
dfs and similar
1600
x22942
376B
I.O.U.
implementation
1300
x6440
376A
Lever
implementation
,
math
900
x9393
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x414
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x7040
375C
Circling Round Treasures
bitmasks
,
shortest paths
2600
x571
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x5087
375A
Divisible by Seven
math
,
number theory
1600
x4878
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x186
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x890
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2758
374B
Inna and Nine
combinatorics
,
greedy
1500
x3338
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2949
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2494
373A
Collecting Beats is Fun
implementation
900
x10764
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x176
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x996
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x4217
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2661
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x13255
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1318
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5735
371C
Hamburgers
binary search
,
brute force
1600
x27192
371B
Fox Dividing Cheese
math
,
number theory
1300
x11538
371A
K-Periodic Array
greedy
,
implementation
,
math
1000
x6164
370E
Summer Reading
dp
,
greedy
2500
x299
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x638
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1589
370B
Berland Bingo
implementation
1300
x2542
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x10616
369E
Valera and Queries
binary search
,
data structures
2200
x2231
369D
Valera and Fools
dfs and similar
,
dp
,
graphs
,
shortest paths
2200
x1184
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x10244
369B
Valera and Contest
constructive algorithms
,
implementation
,
math
1400
x6545
369A
Valera and Plates
greedy
,
implementation
900
x11141
368B
Sereja and Suffixes
data structures
,
dp
1100
x42977
368A
Sereja and Coat Rack
implementation
1000
x7540
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1155
367D
Sereja and Sets
bitmasks
,
dfs and similar
2400
x662
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1801
367B
Sereja ans Anagrams
binary search
,
data structures
1900
x2479
367A
Sereja and Algorithm
data structures
,
implementation
1500
x4335
366E
Dima and Magic Guitar
brute force
,
implementation
,
math
2200
x780
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1570
366C
Dima and Salad
dp
1900
x4926
366B
Dima and To-do List
brute force
,
implementation
1200
x6853
366A
Dima and Guards
implementation
1100
x4549
365B
The Fibonacci Segment
implementation
1100
x14587
365A
Good Number
implementation
1100
x18974
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x591
364D
Ghd
brute force
,
math
,
probabilities
2900
x2127
364C
Beautiful Set
brute force
,
number theory
2300
x601
364B
Free Market
dp
,
greedy
2200
x1187
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4731
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x212
363D
Renting Bikes
binary search
,
greedy
1800
x3994
363C
Fixing Typos
greedy
,
implementation
1400
x13413
363B
Fence
brute force
,
dp
1100
x54597
363A
Soroban
implementation
800
x10865
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x824
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x933
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1815
362B
Petya and Staircases
implementation
,
sortings
1100
x13929
362A
Two Semiknights Meet
greedy
,
math
1500
x2706
361B
Levko and Permutation
constructive algorithms
,
math
,
number theory
1200
x8134
361A
Levko and Table
constructive algorithms
,
implementation
800
x16873
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x718
360D
Levko and Sets
number theory
2600
x408
360C
Levko and Strings
combinatorics
,
dp
2500
x1117
360B
Levko and Array
binary search
,
dp
2000
x3051
360A
Levko and Array Recovery
greedy
,
implementation
1700
x2061
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x478
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x5183
359C
Prime Number
math
,
number theory
1900
x3176
359B
Permutation
constructive algorithms
,
dp
,
math
1400
x8116
359A
Table
constructive algorithms
,
greedy
,
implementation
1000
x8589
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x399
358D
Dima and Hares
dp
,
greedy
1800
x4101
358C
Dima and Containers
constructive algorithms
,
greedy
,
implementation
2000
x2048
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