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Codeforces Round 953 (Div. 2)
26:59:56
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Difficulty:
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combinatorics
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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Custom test
Problems
#
Name
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x205
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1062
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x429
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x2001
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3047
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x716
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3904
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x866
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x805
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x769
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9998
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x670
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x818
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2618
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x527
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1358
1606E
Arena
combinatorics
,
dp
,
math
2100
x3395
1605F
PalindORme
combinatorics
,
dp
2900
x293
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x269
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x406
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1606
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2253
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8458
1594E1
Rubik's Cube Coloring (easy version)
combinatorics
,
math
1300
x10928
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x185
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1163
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3580
1582B
Luntik and Subsequences
combinatorics
,
math
900
x19242
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13308
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x131
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x987
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x591
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x879
1574B
Combinatorics Homework
combinatorics
,
greedy
,
math
1100
x17100
1569C
Jury Meeting
combinatorics
,
math
1500
x11751
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11916
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2232
1558D
Top-Notch Insertions
combinatorics
,
data structures
2600
x935
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8388
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1186
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x198
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3258
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5807
1552B
Running for Gold
combinatorics
,
graphs
,
greedy
,
sortings
1500
x15099
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1768
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1792
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1762
1545C
AquaMoon and Permutations
2-sat
,
brute force
,
combinatorics
,
constructive algorithms
,
graph matchings
,
graphs
2800
x592
1545B
AquaMoon and Chess
combinatorics
,
math
1900
x5693
1543B
Customising the Track
combinatorics
,
greedy
,
math
900
x22771
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x819
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1199
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2543
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2508
1539A
Contest Start
combinatorics
,
geometry
,
greedy
,
math
1000
x19705
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x918
1536E
Omkar and Forest
combinatorics
,
graphs
,
math
,
shortest paths
2300
x2357
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12591
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x754
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x279
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x513
1528B
Kavi on Pairing Duty
combinatorics
,
dp
,
math
1700
x8524
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1846
1526E
Oolimry and Suffix Array
combinatorics
,
constructive algorithms
,
math
2400
x1032
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1997
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1548
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x450
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x817
1515E
Phoenix and Computers
combinatorics
,
dp
,
math
2200
x3410
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x23352
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
2300
x1421
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x13986
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2482
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x3860
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x597
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1258
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1416
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x21049
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1198
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x55
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x579
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x634
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x1879
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x124
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x13067
1475C
Ball in Berland
combinatorics
,
graphs
,
math
1400
x20247
1473G
Tiles
combinatorics
,
dp
,
fft
,
math
2800
x383
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x294
1467D
Sum of Paths
combinatorics
,
dp
,
math
2200
x3554
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x268
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x855
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9303
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13320
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5557
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7793
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x170
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x381
1444B
Divide and Sum
combinatorics
,
math
,
sortings
1900
x6079
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4333
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x347
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