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Before contest
Codeforces Round #793 (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
binary search
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
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x45
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x57
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x61
1305H
Kuroni the Private Tutor
binary search
,
greedy
3500
x62
1071E
Rain Protection
binary search
,
geometry
3500
x77
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x81
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x87
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x100
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x100
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x226
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x77
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x110
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x112
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x115
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x128
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x96
1329E
Dreamoon Loves AA
binary search
,
greedy
3300
x116
1500E
Subset Trick
binary search
,
data structures
3300
x139
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x176
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x193
713E
Sonya Partymaker
binary search
,
dp
3300
x204
607E
Cross Sum
binary search
,
geometry
3300
x207
768G
The Winds of Winter
binary search
,
data structures
3300
x264
576E
Painting Edges
binary search
,
data structures
3300
x643
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x42
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x92
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x96
1482G
Vabank
binary search
,
interactive
3200
x163
1223G
Wooden Raft
binary search
,
math
,
number theory
3200
x163
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x166
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x167
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x170
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x202
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x30
925F
Parametric Circulation
binary search
,
flows
3100
x72
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x99
1250I
Show Must Go On
binary search
,
brute force
,
greedy
,
shortest paths
3100
x112
1190E
Tokitsukaze and Explosion
binary search
,
greedy
3100
x178
164D
Minimum Diameter
binary search
,
brute force
3100
x195
855F
Nagini
binary search
,
data structures
3100
x249
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x279
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x367
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x482
587D
Duff in Mafia
2-sat
,
binary search
3100
x511
185E
Soap Time! - 2
binary search
,
data structures
3000
x81
1572E
Polygon
binary search
,
dp
,
geometry
3000
x159
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x171
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x174
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x184
1476F
Lanterns
binary search
,
data structures
,
dp
3000
x227
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x227
1007C
Guess two numbers
binary search
,
interactive
3000
x269
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x274
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x278
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x292
889E
Mod Mod Mod
binary search
,
dp
,
math
3000
x304
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x336
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x449
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x596
309E
Sheep
binary search
,
greedy
2900
x104
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x184
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x302
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x325
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x364
623C
Electric Charges
binary search
,
dp
2900
x400
685C
Optimal Point
binary search
,
math
2900
x442
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x570
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x706
505E
Mr. Kitayuta vs. Bamboos
binary search
,
greedy
2900
x915
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x105
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x204
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x205
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x242
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x311
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x327
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x373
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x391
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x392
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x419
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x462
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x476
983E
NN country
binary search
,
data structures
,
trees
2800
x556
1279F
New Year and Handle Change
binary search
,
dp
2800
x592
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x82
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x181
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x189
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x245
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x253
721E
Road to Home
binary search
,
dp
2700
x272
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2700
x287
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x314
1379F1
Chess Strikes Back (easy version)
binary search
,
data structures
2700
x331
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x371
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x396
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x425
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x442
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x446
1366F
Jog Around The Graph
binary search
,
dp
,
geometry
,
graphs
2700
x490
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x503
1521E
Nastia and a Beautiful Matrix
binary search
,
constructive algorithms
,
dp
,
greedy
2700
x507
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