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Before contest
Educational Codeforces Round 131 (Rated for Div. 2)
39:52:29
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Difficulty:
—
sortings
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
#
Name
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x58
64I
Sort the Table
*special problem
,
sortings
2400
x65
1381E
Origami
geometry
,
math
,
sortings
3300
x76
48F
Snow sellers
greedy
,
sortings
2800
x76
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x88
64H
Table Bowling
*special problem
,
sortings
2300
x92
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x97
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x102
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x106
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x107
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x114
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x117
887F
Row of Models
greedy
,
sortings
2500
x120
130I
Array sorting
*special problem
,
sortings
2300
x132
720D
Slalom
data structures
,
dp
,
sortings
3100
x134
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x143
1558F
Strange Sort
data structures
,
sortings
3300
x151
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x154
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x167
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x170
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x177
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x185
528E
Triangles 3000
geometry
,
sortings
3100
x187
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x200
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x203
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x206
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x220
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x223
773E
Blog Post Rating
data structures
,
sortings
3000
x225
105C
Item World
brute force
,
implementation
,
sortings
2200
x239
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x240
778E
Selling Numbers
dp
,
sortings
3000
x240
1297D
Bonus Distribution
*special problem
,
binary search
,
greedy
,
sortings
x241
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x246
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x255
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x256
852C
Property
greedy
,
sortings
2100
x274
1662N
Drone Photo
combinatorics
,
math
,
sortings
x277
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x279
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x295
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x296
47E
Cannon
data structures
,
geometry
,
sortings
2200
x301
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x308
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x308
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x309
286D
Tourists
data structures
,
sortings
2600
x312
379E
New Year Tree Decorations
geometry
,
schedules
,
sortings
2500
x315
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x321
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x323
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x332
140F
New Year Snowflake
geometry
,
sortings
2600
x332
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x335
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x340
198E
Gripping Story
binary search
,
data structures
,
sortings
2400
x348
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x349
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x355
1214F
Employment
greedy
,
sortings
2700
x362
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x362
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x365
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x370
1297B
Cartoons
*special problem
,
implementation
,
sortings
x372
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x399
681E
Runaway to a Shadow
geometry
,
sortings
2500
x403
1211C
Ice Cream
*special problem
,
greedy
,
sortings
1700
x421
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x421
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x431
1424M
Ancient Language
graphs
,
sortings
2200
x434
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x434
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x436
173E
Camping Groups
data structures
,
sortings
2600
x439
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x452
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x460
883J
Renovation
constructive algorithms
,
greedy
,
sortings
2400
x463
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x468
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x471
912C
Perun, Ult!
brute force
,
greedy
,
sortings
2500
x471
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x474
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x474
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x476
542A
Place Your Ad Here
data structures
,
sortings
2400
x478
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x479
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x480
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x486
39C
Moon Craters
dp
,
sortings
2100
x490
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x496
163C
Conveyor
sortings
,
two pointers
2100
x505
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x508
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x520
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x526
15D
Map
data structures
,
implementation
,
sortings
2500
x540
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x544
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x553
958E2
Guard Duty (medium)
binary search
,
dp
,
greedy
,
sortings
2200
x562
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x563
1532D
Teams Forming
*special problem
,
sortings
x571
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x574
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x580
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x593
35E
Parade
data structures
,
sortings
2100
x602
596D
Wilbur and Trees
dp
,
math
,
probabilities
,
sortings
2300
x618
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