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Before contest
Codeforces Round 941 (Div. 1)
45:01:26
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Before contest
Codeforces Round 941 (Div. 2)
45:01:26
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data structures
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
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number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1065
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1065
757F
Team Rocket Rises Again
data structures
,
graphs
,
shortest paths
2800
x1065
174C
Range Increments
data structures
,
greedy
1800
x1064
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1061
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1057
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1056
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1049
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1048
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1048
1136E
Nastya Hasn't Written a Legend
binary search
,
data structures
2200
x1040
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1027
878B
Teams Formation
data structures
,
implementation
2300
x1027
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1026
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1025
749E
Inversions After Shuffle
data structures
,
probabilities
2400
x1024
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1021
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1020
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1018
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1017
847D
Dog Show
constructive algorithms
,
data structures
,
greedy
2200
x1012
351D
Jeff and Removing Periods
data structures
2700
x1012
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1011
802B
Heidi and Library (medium)
data structures
,
greedy
1800
x1009
1004E
Sonya and Ice Cream
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
trees
2400
x1007
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1001
707E
Garlands
data structures
2400
x999
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x998
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x995
66C
Petya and File System
data structures
,
implementation
1800
x994
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x990
587F
Duff is Mad
data structures
,
strings
3000
x989
1662L
Il Derby della Madonnina
data structures
,
dp
,
math
x988
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x987
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x986
1635F
Closest Pair
data structures
,
greedy
2800
x979
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x974
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x973
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x973
1044D
Deduction Queries
data structures
,
dsu
2400
x968
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x967
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x967
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x966
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x961
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x958
85B
Embassy Queue
data structures
,
greedy
1800
x957
46D
Parking Lot
data structures
,
implementation
1800
x957
1037H
Security
data structures
,
string suffix structures
3200
x956
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x955
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x954
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x953
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x951
442D
Adam and Tree
data structures
,
trees
2600
x950
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x949
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x946
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x946
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x945
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x945
338E
Optimize!
data structures
2600
x943
1129D
Isolation
data structures
,
dp
2900
x942
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x935
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x931
70D
Professor's task
data structures
,
geometry
2700
x931
1037F
Maximum Reduction
combinatorics
,
data structures
,
math
2500
x929
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x925
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x923
1558D
Top-Notch Insertions
combinatorics
,
data structures
2600
x923
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x922
1906F
Maximize The Value
data structures
,
sortings
2100
x921
220C
Little Elephant and Shifts
data structures
2100
x921
46E
Comb
data structures
,
dp
1900
x916
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x912
799E
Aquarium decoration
data structures
,
greedy
,
two pointers
2500
x911
643G
Choosing Ads
data structures
3200
x911
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x910
926E
Merge Equal Elements
constructive algorithms
,
data structures
1900
x908
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x908
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x907
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x907
895E
Eyes Closed
data structures
,
probabilities
2300
x907
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x906
1468M
Similar Sets
data structures
,
graphs
,
implementation
2300
x903
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x897
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x897
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x896
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x895
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x886
878C
Tournament
data structures
,
graphs
2700
x883
425C
Sereja and Two Sequences
data structures
,
dp
2300
x881
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x880
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x880
1889C2
Doremy's Drying Plan (Hard Version)
data structures
,
dp
2600
x872
939F
Cutlet
data structures
,
dp
2400
x872
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x867
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x866
983E
NN country
binary search
,
data structures
,
trees
2800
x866
1725L
Lemper Cooking Competition
data structures
2400
x862
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x861
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x858
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