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Codeforces Global Round 13
27:34:19
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Difficulty:
—
implementation
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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Custom test
Problems
#
Name
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x51
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x109
1239F
Swiper, no swiping!
graphs
,
implementation
3400
x85
1012F
Passports
dp
,
implementation
3400
x88
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x105
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x41
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x73
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x85
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x30
1089J
JS Minification
greedy
,
implementation
3200
x82
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x118
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x124
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x314
720E
Cipher
implementation
3100
x32
1044E
Grid Sort
implementation
3100
x55
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x92
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x108
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x128
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x189
633H
Fibonacci-ish II
data structures
,
implementation
3100
x281
1239E
Turtle
dp
,
implementation
3100
x298
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x48
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x86
280E
Sequence Transformation
data structures
,
dp
,
implementation
,
math
3000
x109
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x115
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x178
274E
Mirror Room
data structures
,
implementation
3000
x199
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x210
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x264
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x53
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x77
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x136
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x164
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x167
238D
Tape Programming
data structures
,
implementation
2900
x169
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x194
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x209
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x241
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x311
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x100
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x175
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x181
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x186
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x207
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x211
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x282
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x295
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x317
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x318
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x333
1303F
Number of Components
dsu
,
implementation
2800
x351
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x538
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x607
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x80
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x83
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x85
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x109
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x151
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x192
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x223
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2700
x226
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x267
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x292
70E
Information Reform
dp
,
implementation
,
trees
2700
x305
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x334
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x419
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x444
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x513
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x631
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x152
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x261
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x291
761F
Dasha and Photos
brute force
,
data structures
,
dp
,
implementation
2600
x312
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x376
484C
Strange Sorting
implementation
,
math
2600
x436
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x459
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x461
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x495
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x557
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x611
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x693
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x945
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1024
1090G
Combostone
games
,
implementation
2500
x50
44G
Shooting Gallery
data structures
,
implementation
2500
x133
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x153
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x205
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x218
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x246
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x258
852A
Digits
brute force
,
implementation
,
math
2500
x268
93C
Azembler
brute force
,
implementation
2500
x289
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x294
930D
Game with Tokens
data structures
,
games
,
implementation
2500
x295
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x324
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x354
1310B
Double Elimination
dp
,
implementation
2500
x373
611F
New Year and Cleaning
binary search
,
implementation
2500
x385
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x430
15D
Map
data structures
,
implementation
,
sortings
2500
x446
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