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Codeforces Round 940 (Div. 2)
4 days
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*has extra registration
→ Filter Problems
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
472B
Design Tutorial: Learn from Life
1300
x7373
471B
MUH and Important Things
implementation
,
sortings
1300
x5878
469B
Chat Online
implementation
1300
x12268
462B
Appleman and Card Game
greedy
1300
x13970
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x38277
451B
Sort the Array
implementation
,
sortings
1300
x42776
450B
Jzzhu and Sequences
implementation
,
math
1300
x25234
437A
The Child and Homework
implementation
1300
x8868
429A
Xor-tree
dfs and similar
,
trees
1300
x9954
426B
Sereja and Mirroring
implementation
1300
x3763
416B
Art Union
brute force
,
dp
,
implementation
1300
x8421
413B
Spyke Chatting
implementation
1300
x1668
378B
Semifinals
implementation
,
sortings
1300
x5094
376B
I.O.U.
implementation
1300
x6068
371B
Fox Dividing Cheese
math
,
number theory
1300
x10865
370B
Berland Bingo
implementation
1300
x2467
352B
Jeff and Periods
implementation
,
sortings
1300
x15733
347A
Difference Row
constructive algorithms
,
implementation
,
sortings
1300
x8748
332A
Down the Hatch!
implementation
1300
x3520
330B
Road Construction
constructive algorithms
,
graphs
1300
x16308
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7357
312B
Archer
math
,
probabilities
1300
x11028
311A
The Closest Pair
constructive algorithms
,
implementation
1300
x3989
304B
Calendar
brute force
,
implementation
1300
x2917
303A
Lucky Permutation Triple
constructive algorithms
,
implementation
,
math
1300
x7663
298A
Snow Footprints
greedy
,
implementation
1300
x10399
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3010
288A
Polo the Penguin and Strings
greedy
1300
x6270
276B
Little Girl and Game
games
,
greedy
1300
x27082
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12317
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x6843
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16501
246B
Increase and Decrease
greedy
,
math
1300
x10884
241A
Old Peykan
greedy
1300
x2200
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2003
236B
Easy Number Challenge
implementation
,
number theory
1300
x13383
234C
Weather
dp
,
implementation
1300
x5308
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x69344
227A
Where do I Turn?
geometry
1300
x4025
222B
Cosmic Tables
data structures
,
implementation
1300
x5967
221B
Little Elephant and Numbers
implementation
1300
x4495
220A
Little Elephant and Problem
implementation
,
sortings
1300
x11784
215B
Olympic Medal
greedy
,
math
1300
x5337
203B
Game on Paper
brute force
,
implementation
1300
x2540
195B
After Training
data structures
,
implementation
,
math
1300
x5111
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10103
189B
Counting Rhombi
brute force
,
math
1300
x3862
189A
Cut Ribbon
brute force
,
dp
1300
x62051
188B
A + Reverse B
*special problem
,
implementation
1300
x700
185A
Plant
math
1300
x5681
181B
Number of Triplets
binary search
,
brute force
1300
x2860
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2192
171D
Broken checker
*special problem
,
brute force
1300
x2501
171B
Star
*special problem
,
combinatorics
1300
x3929
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4671
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6167
152B
Steps
binary search
,
implementation
1300
x6295
147A
Punctuation
implementation
,
strings
1300
x3538
146B
Lucky Mask
brute force
,
implementation
1300
x4210
144B
Meeting
implementation
1300
x5007
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7417
132A
Turing Tape
implementation
1300
x2723
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3505
117A
Elevator
implementation
,
math
1300
x1969
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2890
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x14337
94B
Friends
graphs
,
implementation
,
math
1300
x4469
92B
Binary Number
greedy
1300
x4686
85A
Domino
constructive algorithms
,
implementation
1300
x1749
83A
Magical Array
math
1300
x6057
71B
Progress Bar
implementation
,
math
1300
x4345
70A
Cookies
math
1300
x3211
66A
Petya and Java
implementation
,
strings
1300
x6176
64A
Factorial
*special problem
,
implementation
1300
x2653
62A
A Student's Dream
greedy
,
math
1300
x3353
61B
Hard Work
strings
1300
x3776
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3514
58B
Coins
greedy
1300
x11753
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2810
56B
Spoilt Permutation
implementation
1300
x3610
54A
Presents
implementation
1300
x1995
51A
Cheaterius's Problem
implementation
1300
x1773
44C
Holidays
implementation
1300
x3187
43C
Lucky Tickets
greedy
1300
x4133
41C
Email address
expression parsing
,
implementation
1300
x3620
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3832
39H
Multiplication Table
implementation
1300
x2600
39F
Pacifist frogs
implementation
1300
x1475
39B
Company Income Growth
greedy
1300
x2546
36A
Extra-terrestrial Intelligence
implementation
1300
x2888
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4049
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5121
25A
IQ test
brute force
1300
x80572
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76414
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