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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
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*has extra registration
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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
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x288
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x299
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x306
1748F
Circular Xor Reversal
bitmasks
,
constructive algorithms
3000
x321
1063E
Lasers and Mirrors
constructive algorithms
,
math
3000
x328
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x355
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x373
341E
Candies Game
constructive algorithms
,
greedy
3000
x426
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x449
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x449
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x457
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x488
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x522
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x549
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x632
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x639
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x1069
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1298
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x95
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x161
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x177
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x216
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x238
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x296
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x324
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x365
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x386
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x394
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x440
1172D
Nauuo and Portals
constructive algorithms
2900
x475
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x498
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x503
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x533
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x569
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x580
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x630
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x127
48H
Black and White
constructive algorithms
2800
x132
74E
Shift It!
constructive algorithms
2800
x140
1267D
DevOps Best Practices
constructive algorithms
2800
x205
1012D
AB-Strings
constructive algorithms
,
strings
2800
x315
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x327
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x332
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x357
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x358
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x365
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x365
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x368
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x386
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x409
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x417
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x421
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x460
819E
Mister B and Flight to the Moon
constructive algorithms
,
graphs
2800
x495
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x510
652F
Ants on a Circle
constructive algorithms
,
math
2800
x515
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x528
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x551
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x575
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x576
1545C
AquaMoon and Permutations
2-sat
,
brute force
,
combinatorics
,
constructive algorithms
,
graph matchings
,
graphs
2800
x578
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x605
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x633
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x661
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x668
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x686
1491G
Switch and Flip
constructive algorithms
,
graphs
,
math
2800
x711
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x767
286E
Ladies' Shop
constructive algorithms
,
fft
,
math
2800
x817
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x911
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x981
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1636
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x76
198D
Cube Snake
constructive algorithms
2700
x99
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x247
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x248
333C
Lucky Tickets
brute force
,
constructive algorithms
2700
x373
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x392
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x397
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x403
1918G
Permutation of Given
constructive algorithms
,
math
2700
x414
1695E
Ambiguous Dominoes
constructive algorithms
,
dfs and similar
,
graphs
2700
x422
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x426
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x433
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x436
778D
Parquet Re-laying
constructive algorithms
2700
x480
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x498
1510J
Japanese Game
constructive algorithms
,
math
2700
x505
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x525
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x537
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x545
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x557
1205D
Almost All
constructive algorithms
,
trees
2700
x610
578E
Walking!
constructive algorithms
,
greedy
2700
x611
1521E
Nastia and a Beautiful Matrix
binary search
,
constructive algorithms
,
dp
,
greedy
2700
x646
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x661
1658F
Juju and Binary String
brute force
,
constructive algorithms
,
greedy
,
math
2700
x719
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x726
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x731
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x739
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