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Before contest
Codeforces Round 937 (Div. 4)
02:46:15
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Difficulty:
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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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Problems
#
Name
44J
Triminoes
constructive algorithms
,
greedy
2000
x550
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x545
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x545
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x544
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x537
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x534
241G
Challenging Balloons
constructive algorithms
1900
x531
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x529
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x527
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x521
183A
Headquarters
constructive algorithms
,
math
1700
x521
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x520
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x520
45E
Director
constructive algorithms
,
greedy
2000
x517
649B
Этажи
constructive algorithms
1400
x516
652F
Ants on a Circle
constructive algorithms
,
math
2800
x515
909F
AND-permutations
constructive algorithms
2500
x511
394C
Dominoes
constructive algorithms
,
greedy
x511
390D
Inna and Sweet Matrix
constructive algorithms
x504
1510J
Japanese Game
constructive algorithms
,
math
2700
x503
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x501
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x499
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x498
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x498
819E
Mister B and Flight to the Moon
constructive algorithms
,
graphs
2800
x495
297D
Color the Carpet
constructive algorithms
2500
x494
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x493
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x493
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x486
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x485
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x485
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x477
1090C
New Year Presents
constructive algorithms
,
data structures
2400
x477
778D
Parquet Re-laying
constructive algorithms
2700
x476
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x475
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x474
1172D
Nauuo and Portals
constructive algorithms
2900
x470
925D
Aztec Catacombs
constructive algorithms
2600
x470
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x470
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x460
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x459
301C
Yaroslav and Algorithm
constructive algorithms
2500
x458
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x456
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x455
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x454
1097E
Egor and an RPG game
constructive algorithms
,
greedy
3400
x452
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x449
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x449
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x443
42C
Safe cracking
brute force
,
constructive algorithms
2200
x441
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x438
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x437
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x435
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x435
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x434
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x432
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x430
341E
Candies Game
constructive algorithms
,
greedy
3000
x426
1031E
Triple Flips
constructive algorithms
2600
x425
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x425
1906L
Palindromic Parentheses
constructive algorithms
2500
x420
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x419
1695E
Ambiguous Dominoes
constructive algorithms
,
dfs and similar
,
graphs
2700
x417
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x415
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x414
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x412
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x407
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x406
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x405
804E
The same permutation
constructive algorithms
3100
x405
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x403
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x401
1918G
Permutation of Given
constructive algorithms
,
math
2700
x397
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x397
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x393
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x390
125D
Two progressions
constructive algorithms
,
greedy
2200
x388
329D
The Evil Temple and the Moving Rocks
constructive algorithms
2500
x386
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x384
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x383
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x383
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x382
42D
Strange town
constructive algorithms
,
math
2300
x381
1267C
Cactus Revenge
constructive algorithms
3500
x377
333C
Lucky Tickets
brute force
,
constructive algorithms
2700
x372
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x371
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x367
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x365
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x365
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x363
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x358
513D2
Constrained Tree
constructive algorithms
,
data structures
2600
x358
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x358
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x355
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x352
209B
Pixels
constructive algorithms
,
math
2100
x351
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x350
26E
Multithreading
constructive algorithms
2400
x350
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x348
1168E
Xor Permutations
constructive algorithms
,
math
3100
x346
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