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Before contest
Codeforces Round 941 (Div. 1)
28:29:13
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Before contest
Codeforces Round 941 (Div. 2)
28:29:13
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two pointers
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
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
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strings
ternary search
trees
two pointers
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Name
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5828
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x5789
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5780
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x5776
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5734
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5707
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5705
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5550
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5541
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5525
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5490
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5481
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5468
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5455
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5398
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5301
734C
Anton and Making Potions
binary search
,
dp
,
greedy
,
two pointers
1600
x5284
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5224
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5173
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5136
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5114
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5076
924B
Three-level Laser
binary search
,
greedy
,
two pointers
1600
x5042
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4965
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4905
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4838
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4811
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4800
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4788
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4759
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4731
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4673
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4649
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4613
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4596
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4559
1073C
Vasya and Robot
binary search
,
two pointers
1800
x4544
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4477
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4452
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4405
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4366
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4357
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4353
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4293
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4240
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4229
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4207
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4203
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4154
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4126
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4115
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4102
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4097
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4079
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3951
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3924
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x3909
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3906
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3901
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3869
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3859
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3856
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3853
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3792
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3709
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3644
430B
Balls Game
brute force
,
two pointers
1400
x3623
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3521
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3478
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3456
229A
Shifts
brute force
,
two pointers
1500
x3435
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3416
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3413
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3406
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3344
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3307
1168B
Good Triple
brute force
,
two pointers
1900
x3306
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3294
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3235
769B
News About Credit
*special problem
,
greedy
,
two pointers
1200
x3232
873C
Strange Game On Matrix
greedy
,
two pointers
1600
x3208
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3195
645C
Enduring Exodus
binary search
,
two pointers
1600
x3150
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3066
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3029
939E
Maximize!
binary search
,
greedy
,
ternary search
,
two pointers
1800
x3004
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x2983
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2980
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x2957
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2928
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2920
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2902
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2896
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2885
1744F
MEX vs MED
math
,
two pointers
2000
x2867
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2859
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2846
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2823
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2797
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2740
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