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Before contest
Educational Codeforces Round 166 (Rated for Div. 2)
27:28:31
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Difficulty:
—
greedy
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
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x563
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2521
402A
Nuts
greedy
,
math
1100
x4521
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x19326
401B
Sereja and Contests
greedy
,
implementation
,
math
1200
x4388
394C
Dominoes
constructive algorithms
,
greedy
x512
391F2
Stock Trading
greedy
x104
391C2
The Tournament
greedy
x131
389B
Fox and Cross
greedy
,
implementation
1100
x6826
389A
Fox and Number Game
greedy
,
math
1000
x13863
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3103
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x11365
387C
George and Number
greedy
,
implementation
1700
x2165
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x11939
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9562
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x16246
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3491
383A
Milking cows
data structures
,
greedy
1600
x5216
382A
Ksenia and Pan Scales
greedy
,
implementation
1100
x11821
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x6594
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x60987
379C
New Year Ratings Change
greedy
,
sortings
1400
x6498
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x1977
374B
Inna and Nine
combinatorics
,
greedy
1500
x3238
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2844
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12426
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1211
371A
K-Periodic Array
greedy
,
implementation
,
math
1000
x5957
370E
Summer Reading
dp
,
greedy
2500
x231
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x615
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1508
369A
Valera and Plates
greedy
,
implementation
900
x10826
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1708
364B
Free Market
dp
,
greedy
2200
x1151
363D
Renting Bikes
binary search
,
greedy
1800
x3756
363C
Fixing Typos
greedy
,
implementation
1400
x13099
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x897
362A
Two Semiknights Meet
greedy
,
math
1500
x2632
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x677
360A
Levko and Array Recovery
greedy
,
implementation
1700
x2024
359A
Table
constructive algorithms
,
greedy
,
implementation
1000
x8394
358D
Dima and Hares
dp
,
greedy
1800
x3899
358C
Dima and Containers
constructive algorithms
,
greedy
,
implementation
2000
x1955
357A
Group of Students
brute force
,
greedy
,
implementation
1000
x6719
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x939
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1231
355B
Vasya and Public Transport
greedy
,
implementation
1100
x4437
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5403
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x569
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2180
351E
Jeff and Permutation
greedy
2200
x1512
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2719
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6469
350A
TL
brute force
,
greedy
,
implementation
1200
x16016
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13541
349A
Cinema Line
greedy
,
implementation
1100
x28854
346C
Number Transformation II
greedy
,
math
2200
x1420
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x691
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2909
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13122
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x3986
342A
Xenia and Divisors
greedy
,
implementation
1200
x12167
341E
Candies Game
constructive algorithms
,
greedy
3000
x431
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x539
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8163
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x200110
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4786
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9113
337A
Puzzles
greedy
900
x76023
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2378
335F
Buy One, Get One Free
dp
,
greedy
3000
x460
335A
Banana
binary search
,
constructive algorithms
,
greedy
1400
x2519
333B
Chips
greedy
1800
x2605
333A
Secrets
greedy
1600
x3937
332E
Binary Key
dp
,
greedy
,
implementation
2400
x298
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x888
329A
Purification
constructive algorithms
,
greedy
1500
x4596
328B
Sheldon and Ice Pieces
greedy
1500
x1265
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x753
322A
Ciel and Dancing
greedy
1000
x8097
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x528
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6845
321B
Ciel and Duel
dp
,
flows
,
greedy
1900
x2972
320A
Magic Numbers
brute force
,
greedy
900
x33929
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x616
316A1
Special Task
greedy
1100
x2597
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x542
313C
Ilya and Matrix
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x5532
309E
Sheep
binary search
,
greedy
2900
x219
309C
Memory for Arrays
binary search
,
bitmasks
,
greedy
1900
x1294
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x438
305C
Ivan and Powers of Two
greedy
,
implementation
1600
x2423
298B
Sail
brute force
,
greedy
,
implementation
1200
x13601
298A
Snow Footprints
greedy
,
implementation
1300
x10542
297B
Fish Weight
constructive algorithms
,
greedy
1600
x3450
296A
Yaroslav and Permutations
greedy
,
math
1100
x22095
294B
Shaass and Bookshelf
dp
,
greedy
1700
x4390
293A
Weird Game
games
,
greedy
1500
x2820
291D
Parallel Programming
*special problem
,
greedy
1600
x1468
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x128
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