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Before contest
Codeforces Round 941 (Div. 1)
47:04:15
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Before contest
Codeforces Round 941 (Div. 2)
47:04:15
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→ Filter Problems
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two pointers
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
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2510
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2521
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x2549
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2584
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2599
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2601
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2678
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2731
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2738
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2797
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2821
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2846
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2859
1744F
MEX vs MED
math
,
two pointers
2000
x2867
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2884
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2896
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2901
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2920
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2927
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x2957
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2980
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x2982
939E
Maximize!
binary search
,
greedy
,
ternary search
,
two pointers
1800
x3004
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3029
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3066
645C
Enduring Exodus
binary search
,
two pointers
1600
x3150
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3195
873C
Strange Game On Matrix
greedy
,
two pointers
1600
x3208
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3230
769B
News About Credit
*special problem
,
greedy
,
two pointers
1200
x3232
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3294
1168B
Good Triple
brute force
,
two pointers
1900
x3305
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3307
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3343
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3406
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3412
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3416
229A
Shifts
brute force
,
two pointers
1500
x3435
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3453
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3477
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3520
430B
Balls Game
brute force
,
two pointers
1400
x3621
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3643
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3706
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3791
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3853
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3854
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3859
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3868
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3900
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3906
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x3909
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3923
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3951
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4077
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4097
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4100
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4115
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4125
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4154
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4201
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4206
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4229
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4239
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4291
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4352
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4357
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4366
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4404
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4452
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4474
1073C
Vasya and Robot
binary search
,
two pointers
1800
x4544
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4559
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4595
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4613
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4648
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4673
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4731
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4758
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4785
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4800
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4811
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4837
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4903
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4964
924B
Three-level Laser
binary search
,
greedy
,
two pointers
1600
x5042
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5066
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5113
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5132
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5171
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5224
734C
Anton and Making Potions
binary search
,
dp
,
greedy
,
two pointers
1600
x5284
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5300
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5397
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5451
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5468
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5480
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5489
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5525
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5541
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