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Educational Codeforces Round 169 (Rated for Div. 2)
06:06:08
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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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Status
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Custom test
Problems
#
Name
978G
Petya's Exams
greedy
,
implementation
,
sortings
1700
x4314
978F
Mentors
binary search
,
data structures
,
implementation
1500
x8194
978E
Bus Video System
combinatorics
,
math
1400
x9446
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8608
977F
Consecutive Subsequence
dp
1700
x18121
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x20122
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x18083
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x6713
976B
Lara Croft and the New Game
implementation
,
math
1300
x5687
975C
Valhalla Siege
binary search
1400
x9549
965B
Battleship
implementation
1300
x4515
964B
Messages
math
1300
x4338
962D
Merge Equals
data structures
,
implementation
1600
x6815
962C
Make a Square
brute force
,
implementation
,
math
1400
x7789
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7637
962A
Equator
implementation
1300
x12713
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5272
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3911
960B
Minimize the error
data structures
,
greedy
,
sortings
1500
x7723
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5737
958F1
Lightsabers (easy)
implementation
1500
x1600
958E1
Guard Duty (easy)
brute force
,
geometry
,
greedy
,
math
1600
x1501
958D1
Hyperspace Jump (easy)
expression parsing
,
math
1400
x2059
958A1
Death Stars (easy)
implementation
1400
x1649
957A
Tritonic Iridescence
implementation
1300
x5730
955B
Not simply beatiful strings
implementation
1400
x4789
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6522
954C
Matrix Walk
implementation
1700
x3759
954B
String Typing
implementation
,
strings
1400
x7201
952C
Ravioli Sort
implementation
1600
x2892
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3708
949A
Zebras
greedy
1600
x5329
946C
String Transformation
greedy
,
strings
1300
x8822
940D
Alena And The Heater
binary search
,
implementation
1600
x3605
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5752
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x8921
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7224
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4612
938C
Constructing Tests
binary search
,
brute force
,
constructive algorithms
1700
x3303
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6842
936A
Save Energy!
binary search
,
implementation
,
math
1700
x4346
935C
Fifa and Fafa
geometry
1600
x4714
934A
A Compatible Pair
brute force
,
games
1400
x6946
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x4002
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x7980
931C
Laboratory Work
implementation
,
math
1700
x3340
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2638
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x6993
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1150
929B
Места в самолёте
*special problem
,
implementation
1300
x2038
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2494
928B
Chat
*special problem
,
dp
1400
x2525
926I
A Vital Problem
1700
x654
926G
Large Bouquets
1500
x1470
926D
Choose Place
1600
x905
926C
Is This a Zebra?
implementation
1700
x1879
926A
2-3-numbers
implementation
,
math
1300
x3721
925B
Resource Distribution
binary search
,
implementation
,
sortings
1700
x2187
925A
Stairs and Elevators
binary search
1600
x3386
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x3790
924B
Three-level Laser
binary search
,
greedy
,
two pointers
1600
x5214
924A
Mystical Mosaic
greedy
,
implementation
1300
x5030
923B
Producing Snow
binary search
,
data structures
1600
x7258
923A
Primal Sport
math
,
number theory
1700
x5008
922C
Cave Painting
brute force
,
number theory
1600
x6980
922B
Magic Forest
brute force
1300
x8412
922A
Cloning Toys
implementation
1300
x11475
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9109
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x9736
919C
Seat Arrangements
brute force
,
implementation
1300
x8915
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3508
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x5064
915C
Permute Digits
dp
,
greedy
1700
x6984
915B
Browser
implementation
1300
x7701
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7839
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11855
911C
Three Garlands
brute force
,
constructive algorithms
1400
x7000
910C
Minimum Sum
constructive algorithms
,
greedy
,
math
1700
x1772
910B
Door Frames
greedy
,
implementation
1600
x1691
909B
Segments
constructive algorithms
,
math
1300
x6319
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6868
907B
Tic-Tac-Toe
implementation
1400
x4049
907A
Masha and Bears
brute force
,
implementation
1300
x5646
906A
Shockers
implementation
,
strings
1600
x4115
901A
Hashing Trees
constructive algorithms
,
trees
1500
x5051
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4522
900B
Position in Fraction
math
,
number theory
1300
x7781
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8395
898E
Squares and not squares
constructive algorithms
,
greedy
1600
x4541
898D
Alarm Clock
greedy
1600
x3858
898C
Phone Numbers
implementation
,
strings
1400
x5232
897B
Chtholly's request
brute force
1300
x7138
896A
Nephren gives a riddle
binary search
,
dfs and similar
1700
x3438
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3458
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x22567
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x9964
888D
Almost Identity Permutations
combinatorics
,
dp
,
math
1600
x8116
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8169
887C
Solution for Cube
brute force
,
implementation
1500
x2881
887B
Cubes for Masha
brute force
,
implementation
1300
x5601
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