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Before contest
Codeforces Round 937 (Div. 4)
06:23:03
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Difficulty:
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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
1786A2
Alternating Deck (hard version)
implementation
800
x11164
1725B
Basketball Together
binary search
,
greedy
,
sortings
1000
x11131
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11130
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x11101
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x11099
1140B
Good String
implementation
,
strings
1200
x11097
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11090
1881E
Block Sequence
dp
1500
x11086
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11085
1282B1
K for the Price of One (Easy Version)
dp
,
greedy
,
sortings
1400
x11083
1628B
Peculiar Movie Preferences
greedy
,
strings
1700
x11081
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11074
757A
Gotta Catch Em' All!
implementation
1000
x11046
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x11045
1623C
Balanced Stone Heaps
binary search
,
greedy
1600
x11041
952A
Quirky Quantifiers
math
800
x11037
1263B
PIN Codes
greedy
,
implementation
1400
x11035
1760F
Quests
binary search
,
greedy
,
sortings
1500
x11026
1185C1
Exam in BerSU (easy version)
greedy
,
sortings
1200
x11023
1271B
Blocks
greedy
,
math
1300
x11010
938A
Word Correction
implementation
800
x11007
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x10993
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x10991
1143C
Queen
dfs and similar
,
trees
1400
x10985
778A
String Game
binary search
,
greedy
,
strings
1700
x10980
1213D2
Equalizing by Division (hard version)
brute force
,
math
,
sortings
1600
x10978
1882C
Card Game
brute force
,
greedy
1500
x10975
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x10973
1068B
LCM
math
,
number theory
1200
x10971
312B
Archer
math
,
probabilities
1300
x10963
1581B
Diameter of Graph
constructive algorithms
,
graphs
,
greedy
,
math
1200
x10957
1213D1
Equalizing by Division (easy version)
brute force
,
implementation
1500
x10957
682B
Alyona and Mex
sortings
1200
x10954
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x10948
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x10939
1003B
Binary String Constructing
constructive algorithms
1300
x10936
408A
Line to Cashier
implementation
900
x10933
1004A
Sonya and Hotels
implementation
900
x10932
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x10924
670B
Game of Robots
implementation
1000
x10923
225A
Dice Tower
constructive algorithms
,
greedy
1100
x10920
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x10919
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x10915
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x10910
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x10891
887A
Div. 64
implementation
1000
x10889
787A
The Monster
brute force
,
math
,
number theory
1200
x10888
1558A
Charmed by the Game
brute force
,
math
1300
x10886
893B
Beautiful Divisors
brute force
,
implementation
1000
x10873
246B
Increase and Decrease
greedy
,
math
1300
x10865
253A
Boys and Girls
greedy
1100
x10864
1217B
Zmei Gorynich
greedy
,
math
1600
x10862
1253B
Silly Mistake
greedy
,
implementation
1400
x10856
1100B
Build a Contest
data structures
,
implementation
1300
x10856
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x10851
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x10848
1037A
Packets
constructive algorithms
,
greedy
,
math
1300
x10837
743A
Vladik and flights
constructive algorithms
,
greedy
,
implementation
1200
x10826
262B
Roma and Changing Signs
greedy
1200
x10824
1099B
Squares and Segments
binary search
,
constructive algorithms
,
math
1100
x10818
1151A
Maxim and Biology
brute force
,
strings
1000
x10809
911B
Two Cakes
binary search
,
brute force
,
implementation
1200
x10803
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x10796
1013A
Piles With Stones
math
800
x10795
371B
Fox Dividing Cheese
math
,
number theory
1300
x10792
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x10790
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x10788
1461C
Random Events
dp
,
math
,
probabilities
1500
x10788
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x10786
1594E1
Rubik's Cube Coloring (easy version)
combinatorics
,
math
1300
x10783
810B
Summer sell-off
greedy
,
sortings
1300
x10780
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x10775
1396B
Stoned Game
brute force
,
constructive algorithms
,
games
,
greedy
1800
x10774
1216D
Swords
math
1300
x10770
1215C
Swap Letters
constructive algorithms
,
greedy
1500
x10748
1105A
Salem and Sticks
brute force
,
implementation
1100
x10747
1117A
Best Subsegment
implementation
,
math
1100
x10732
835B
The number on the board
greedy
1100
x10727
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x10714
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x10710
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x10707
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10706
1065B
Vasya and Isolated Vertices
constructive algorithms
,
graphs
1300
x10701
607B
Zuma
dp
1900
x10698
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10696
1251B
Binary Palindromes
greedy
,
strings
1400
x10685
1043A
Elections
implementation
,
math
800
x10682
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x10675
1945C
Left and Right Houses
brute force
1200
x10671
369A
Valera and Plates
greedy
,
implementation
900
x10666
1467B
Hills And Valleys
brute force
,
implementation
1700
x10658
877A
Alex and broken contest
implementation
,
strings
1100
x10658
714A
Meeting of Old Friends
implementation
,
math
1100
x10656
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10649
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10649
127A
Wasted Time
geometry
900
x10643
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10642
315A
Sereja and Bottles
brute force
1400
x10631
946B
Weird Subtraction Process
math
,
number theory
1100
x10628
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x10625
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