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Codeforces Round 937 (Div. 4)
00:00:36
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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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Status
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Custom test
Problems
#
Name
271C
Secret
constructive algorithms
,
implementation
1500
x2893
22C
System Administrator
graphs
1700
x2892
404B
Marathon
implementation
,
math
1500
x2891
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2888
863E
Turn Off The TV
data structures
,
sortings
2000
x2887
595B
Pasha and Phone
binary search
,
math
1600
x2885
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2884
641E
Little Artem and Time Machine
data structures
2000
x2882
102A
Clothes
brute force
1200
x2882
891B
Gluttony
constructive algorithms
,
greedy
2000
x2879
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2878
1183H
Subsequences (hard version)
dp
,
strings
1900
x2878
36A
Extra-terrestrial Intelligence
implementation
1300
x2877
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x2875
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2874
383D
Antimatter
dp
2300
x2871
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2869
145E
Lucky Queries
data structures
2400
x2866
1218F
Workout plan
data structures
,
greedy
1500
x2865
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2864
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x2863
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2859
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2858
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2858
1305E
Kuroni and the Score Distribution
constructive algorithms
,
greedy
,
implementation
,
math
2200
x2850
417A
Elimination
dp
,
implementation
,
math
1500
x2850
1089G
Guest Student
math
1500
x2846
665A
Buses Between Cities
implementation
1600
x2846
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2845
181B
Number of Triplets
binary search
,
brute force
1300
x2845
1320C
World of Darkraft: Battle for Azathoth
brute force
,
data structures
,
sortings
2000
x2841
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2839
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2838
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2836
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2834
288B
Polo the Penguin and Houses
combinatorics
1500
x2834
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2833
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x2833
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2832
1250J
The Parade
binary search
,
greedy
1800
x2832
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2830
887C
Solution for Cube
brute force
,
implementation
1500
x2828
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2821
952C
Ravioli Sort
implementation
1600
x2820
1744F
MEX vs MED
math
,
two pointers
2000
x2819
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2819
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2819
1077F2
Pictures with Kittens (hard version)
data structures
,
dp
2100
x2817
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x2816
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2815
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2812
635A
Orchestra
brute force
,
implementation
1100
x2811
177B2
Rectangular Game
number theory
1200
x2810
33C
Wonderful Randomized Sum
greedy
1800
x2807
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x2805
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2804
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2803
29B
Traffic Lights
implementation
1500
x2801
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2800
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2800
1092D2
Great Vova Wall (Version 2)
data structures
,
implementation
2200
x2799
466D
Increase Sequence
combinatorics
,
dp
2100
x2798
491A
Up the hill
constructive algorithms
,
implementation
1000
x2795
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2792
1267L
Lexicography
constructive algorithms
,
strings
1800
x2790
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2788
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x2786
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2784
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2783
622D
Optimal Number Permutation
constructive algorithms
1900
x2780
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2777
455D
Serega and Fun
data structures
2700
x2777
275B
Convex Shape
constructive algorithms
,
implementation
1700
x2777
610C
Harmony Analysis
constructive algorithms
1800
x2775
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x2772
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2769
190B
Surrounded
geometry
1800
x2769
1552F
Telepanting
binary search
,
data structures
,
dp
,
sortings
2200
x2768
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x2768
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2768
1662H
Boundary
brute force
,
math
x2766
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2765
293A
Weird Game
games
,
greedy
1500
x2761
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2758
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2754
1067A
Array Without Local Maximums
dp
1900
x2754
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x2754
1342E
Placing Rooks
combinatorics
,
fft
,
math
2300
x2751
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2751
958C1
Encryption (easy)
brute force
1200
x2749
1375E
Inversion SwapSort
constructive algorithms
,
greedy
,
sortings
2500
x2747
319A
Malek Dance Club
combinatorics
,
math
1600
x2747
444C
DZY Loves Colors
data structures
2400
x2745
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2741
690A1
Collective Mindsets (easy)
1100
x2741
830B
Cards Sorting
data structures
,
implementation
,
sortings
1600
x2739
1029E
Tree with Small Distances
dp
,
graphs
,
greedy
2100
x2736
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2734
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2733
1734E
Rectangular Congruence
constructive algorithms
,
number theory
2100
x2730
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