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Codeforces Round 973 (Div. 2)
00:59:29
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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
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1242
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x9001
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2312
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1422
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x526
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1256
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2468
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2216
413D
2048
bitmasks
,
dp
2000
x811
412E
E-mail Addresses
implementation
1900
x840
412D
Giving Awards
dfs and similar
2000
x1875
409F
000001
*special problem
1900
x2087
404D
Minesweeper 1D
dp
,
implementation
1900
x2144
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4141
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x947
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2896
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3345
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2468
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x428
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x779
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6404
382B
Number Busters
binary search
,
math
2000
x1402
380C
Sereja and Brackets
data structures
,
schedules
2000
x14804
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1552
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x2022
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x862
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2733
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2911
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x4079
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2600
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1288
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x628
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1781
367B
Sereja ans Anagrams
binary search
,
data structures
1900
x2461
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1555
366C
Dima and Salad
dp
1900
x4770
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x926
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1743
360B
Levko and Array
binary search
,
dp
2000
x2900
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x5058
359C
Prime Number
math
,
number theory
1900
x3026
358C
Dima and Containers
constructive algorithms
,
greedy
,
implementation
2000
x2004
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1262
356B
Xenia and Hamming
implementation
,
math
1900
x1922
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x3047
353D
Queue
constructive algorithms
,
dp
2000
x2855
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2277
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2371
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2076
346B
Lucky Common Subsequence
dp
,
strings
2000
x3496
345C
Counting Fridays
*special problem
2000
x126
345B
Triskaidekaphobia
*special problem
2100
x125
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5745
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x3003
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x496
342C
Cupboard and Balloons
geometry
1900
x1847
340E
Iahub and Permutations
combinatorics
,
math
2000
x2459
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2070
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x6068
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x972
336B
Vasily the Bear and Fly
math
1900
x1213
335C
More Reclamation
games
2100
x525
335B
Palindrome
constructive algorithms
,
dp
1900
x2088
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x2092
331B2
Shave Beaver!
data structures
1900
x718
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2269
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x7196
321B
Ciel and Duel
dp
,
flows
,
greedy
1900
x3073
319C
Kalila and Dimna in the Logging Industry
dp
,
geometry
2100
x5130
319B
Psychos in a Line
data structures
,
implementation
1900
x4120
317B
Ants
brute force
,
implementation
2000
x1599
314C
Sereja and Subsequences
data structures
,
dp
2000
x1832
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1514
313D
Ilya and Roads
dp
2100
x1457
309C
Memory for Arrays
binary search
,
bitmasks
,
greedy
1900
x1339
309B
Context Advertising
dp
,
two pointers
2100
x711
309A
Morning run
binary search
,
math
,
two pointers
2000
x486
306C
White, Black and White Again
combinatorics
,
number theory
2100
x479
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x442
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2387
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2229
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1690
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3793
292E
Copying Data
data structures
1900
x4083
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2426
292C
Beautiful IP Addresses
brute force
2000
x1167
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1307
286C
Main Sequence
greedy
,
implementation
2100
x1503
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1543
283C
Coin Troubles
dp
2100
x1433
282D
Yet Another Number Game
dp
,
games
2100
x1423
280A
Rectangle Puzzle
geometry
2000
x1462
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1437
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1596
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1673
268E
Playlist
math
,
probabilities
,
sortings
2100
x986
267B
Dominoes
dfs and similar
,
graphs
2000
x632
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1347
264C
Choosing Balls
dp
2000
x2898
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1075
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