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Before contest
Educational Codeforces Round 131 (Rated for Div. 2)
40:52:29
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Difficulty:
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constructive algorithms
combine-tags-by-or
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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
x33
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x43
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x48
1685D2
Permutation Weight (Hard Version)
constructive algorithms
,
greedy
3500
x51
1276E
Four Stones
constructive algorithms
3500
x59
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x64
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x78
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x85
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x94
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x106
1053E
Euler tour
constructive algorithms
,
trees
3500
x151
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x158
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x190
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x266
1267C
Cactus Revenge
constructive algorithms
3500
x364
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x40
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x42
1078E
Negative Time Summation
constructive algorithms
3400
x72
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x91
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x124
1097E
Egor and an RPG game
constructive algorithms
,
greedy
3400
x368
737F
Dirty plates
constructive algorithms
,
math
3300
x55
1530G
What a Reversal
constructive algorithms
3300
x92
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x108
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x145
1060H
Sophisticated Device
constructive algorithms
3300
x155
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x159
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x183
1237H
Balanced Reversals
constructive algorithms
3300
x185
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x241
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x260
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x57
1267H
Help BerLine
constructive algorithms
3200
x62
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x74
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x102
1242E
Planar Perimeter
constructive algorithms
,
graphs
3200
x114
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x130
543E
Listening to Music
constructive algorithms
,
data structures
3200
x160
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x168
1656G
Cycle Palindrome
constructive algorithms
,
graphs
,
math
3200
x170
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x241
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x378
1025G
Company Acquisitions
constructive algorithms
,
math
3200
x379
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x393
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x416
720C
Homework
constructive algorithms
3100
x78
331E2
Deja Vu
constructive algorithms
,
dp
3100
x120
317E
Princess and Her Shadow
constructive algorithms
,
shortest paths
3100
x120
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x158
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x160
1168E
Xor Permutations
constructive algorithms
,
math
3100
x185
715D
Create a Maze
constructive algorithms
3100
x189
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x238
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x240
1329D
Dreamoon Likes Strings
constructive algorithms
,
data structures
3100
x248
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x267
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x301
804E
The same permutation
constructive algorithms
3100
x340
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x349
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x411
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x31
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x51
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x64
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x152
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x182
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x243
1063E
Lasers and Mirrors
constructive algorithms
,
math
3000
x264
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x301
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x308
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x316
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x321
341E
Candies Game
constructive algorithms
,
greedy
3000
x330
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x335
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x342
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x386
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x796
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x799
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x84
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x153
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x185
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x199
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x215
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x261
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x277
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x313
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x338
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x363
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x366
1172D
Nauuo and Portals
constructive algorithms
2900
x371
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x378
48H
Black and White
constructive algorithms
2800
x104
74E
Shift It!
constructive algorithms
2800
x105
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x106
1267D
DevOps Best Practices
constructive algorithms
2800
x166
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x199
1012D
AB-Strings
constructive algorithms
,
strings
2800
x244
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x248
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x256
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x261
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x263
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