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Before contest
Codeforces Round #793 (Div. 2)
02:29:40
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Difficulty:
—
constructive algorithms
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
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x28
1193C
Scissors and Tape
*special problem
,
constructive algorithms
,
geometry
x28
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x29
1170H
Longest Saw
*special problem
,
constructive algorithms
x34
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x35
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x37
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x38
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x41
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x47
1684H
Hard Cut
constructive algorithms
,
divide and conquer
,
math
3400
x51
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x51
737F
Dirty plates
constructive algorithms
,
math
3300
x55
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x57
1276E
Four Stones
constructive algorithms
3500
x58
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x61
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x61
1267H
Help BerLine
constructive algorithms
3200
x62
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x63
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x67
1078E
Negative Time Summation
constructive algorithms
3400
x72
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x73
198D
Cube Snake
constructive algorithms
2700
x74
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x75
720C
Homework
constructive algorithms
3100
x78
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x84
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x85
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x87
1530G
What a Reversal
constructive algorithms
3300
x88
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x101
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x104
48H
Black and White
constructive algorithms
2800
x104
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x105
74E
Shift It!
constructive algorithms
2800
x105
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x106
1663G
Six Characters
constructive algorithms
,
strings
x114
1242E
Planar Perimeter
constructive algorithms
,
graphs
3200
x114
331E2
Deja Vu
constructive algorithms
,
dp
3100
x120
317E
Princess and Her Shadow
constructive algorithms
,
shortest paths
3100
x120
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x122
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x129
1302B
DAG
constructive algorithms
x141
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x144
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x148
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x148
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x151
1053E
Euler tour
constructive algorithms
,
trees
3500
x151
1656G
Cycle Palindrome
constructive algorithms
,
graphs
,
math
3200
x153
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x153
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x154
1060H
Sophisticated Device
constructive algorithms
3300
x154
98D
Help Monks
constructive algorithms
2500
x155
290E
HQ
*special problem
,
constructive algorithms
2500
x156
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x157
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x158
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x159
543E
Listening to Music
constructive algorithms
,
data structures
3200
x159
1267D
DevOps Best Practices
constructive algorithms
2800
x166
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x172
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x175
952G
Puzzling Language
constructive algorithms
2200
x177
1070L
Odd Federalization
constructive algorithms
2600
x179
1168E
Xor Permutations
constructive algorithms
,
math
3100
x181
1237H
Balanced Reversals
constructive algorithms
3300
x183
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x184
715D
Create a Maze
constructive algorithms
3100
x184
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x188
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x189
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x199
398C
Tree and Array
constructive algorithms
x199
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x207
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x214
774H
Repairing Of String
*special problem
,
constructive algorithms
2200
x217
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x219
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x221
306D
Polygon
constructive algorithms
,
geometry
2300
x221
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x225
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x226
566B
Replicating Processes
constructive algorithms
,
greedy
2600
x228
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x230
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x232
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x232
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x233
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x235
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x235
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x236
1012D
AB-Strings
constructive algorithms
,
strings
2800
x236
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x237
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x239
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x240
1329D
Dreamoon Likes Strings
constructive algorithms
,
data structures
3100
x243
593C
Beautiful Function
constructive algorithms
,
math
2200
x245
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x246
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x253
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x258
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x258
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x260
1063E
Lasers and Mirrors
constructive algorithms
,
math
3000
x262
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x272
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x274
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x275
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