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Before contest
Codeforces Round 978 (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
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
Submit
Status
Standings
Custom test
Problems
#
Name
1291B
Array Sharpening
greedy
,
implementation
1300
x14175
1291A
Even But Not Even
greedy
,
math
,
strings
900
x19565
1290F
Making Shapes
dp
3500
x380
1290E
Cartesian Tree
data structures
3300
x549
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x828
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1733
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5442
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8569
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x515
1288E
Messenger Simulator
data structures
2000
x3589
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x7190
1288C
Two Arrays
combinatorics
,
dp
1600
x12902
1288B
Yet Another Meme Problem
math
1100
x17058
1288A
Deadline
binary search
,
brute force
,
math
,
ternary search
1100
x18296
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9443
1287A
Angry Students
greedy
,
implementation
800
x20602
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x244
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x518
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x593
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x649
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1436
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4712
1286A
Garland
dp
,
greedy
,
sortings
1800
x8818
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1149
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1838
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7726
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x23511
1285B
Just Eat It!
dp
,
greedy
,
implementation
1300
x22726
1285A
Mezo Playing Zoma
math
800
x28092
1284G
Seollal
graphs
3300
x174
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x323
1284E
New Year and Castle Construction
combinatorics
,
geometry
,
math
,
sortings
2500
x1302
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x3161
1284C
New Year and Permutation
combinatorics
,
math
1600
x8037
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x10835
1284A
New Year and Naming
implementation
,
strings
800
x18010
1283F
DIY Garland
constructive algorithms
,
greedy
,
trees
2200
x1858
1283E
New Year Parties
dp
,
greedy
1800
x6553
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x7798
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x13149
1283B
Candies Division
math
900
x21670
1283A
Minutes Before the New Year
math
800
x49949
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x1146
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2238
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4312
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10193
1282B1
K for the Price of One (Easy Version)
dp
,
greedy
,
sortings
1400
x11491
1282A
Temporarily unavailable
implementation
,
math
900
x14795
1281B
Azamon Web Services
greedy
1600
x8296
1281A
Suffix Three
implementation
800
x17950
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x62
1280E
Kirchhoff's Current Loss
math
2900
x202
1280D
Miss Punyverse
dp
,
greedy
,
trees
2500
x1010
1280C
Jeremy Bearimy
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2682
1280B
Beingawesomeism
implementation
,
math
1800
x3943
1280A
Cut and Paste
implementation
,
math
1700
x5409
1279F
New Year and Handle Change
binary search
,
dp
2800
x887
1279E
New Year Permutations
combinatorics
,
dp
2700
x377
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x6339
1279C
Stack of Presents
data structures
,
implementation
1400
x11700
1279B
Verse For Santa
binary search
,
brute force
,
implementation
1300
x13663
1279A
New Year Garland
math
900
x16947
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1886
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1919
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3998
1278C
Berry Jam
data structures
,
dp
,
greedy
,
implementation
1700
x8049
1278B
A and B
greedy
,
math
1500
x13309
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x16697
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x3124
1277B
Make Them Odd
greedy
,
number theory
1200
x15202
1277A
Happy Birthday, Polycarp!
implementation
1000
x13383
1276F
Asterisk Substrings
string suffix structures
3400
x341
1276E
Four Stones
constructive algorithms
3500
x90
1276D
Tree Elimination
dp
,
trees
2900
x558
1276C
Beautiful Rectangle
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
greedy
,
math
2300
x1664
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4967
1276A
As Simple as One and Two
dp
,
greedy
1400
x12327
1275F
Шардирование постов
*special problem
,
binary search
,
interactive
x92
1275E3
Контрольная сумма
*special problem
x56
1275E2
Контрольная сумма
*special problem
x130
1275E1
Контрольная сумма
*special problem
x254
1275D
Storage2
*special problem
x421
1275C
#define Задача B ...
*special problem
x669
1275B
Code Review
*special problem
x821
1275A
Скрытый друг
*special problem
x887
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1970
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x6318
1272D
Remove One Element
brute force
,
dp
1500
x16596
1272C
Yet Another Broken Keyboard
combinatorics
,
dp
,
implementation
1200
x26559
1272B
Snow Walking Robot
constructive algorithms
,
greedy
,
implementation
1200
x13903
1272A
Three Friends
brute force
,
greedy
,
math
,
sortings
900
x20698
1271F
Divide The Students
brute force
2700
x192
1271E
Common Number
binary search
,
combinatorics
,
dp
,
math
2100
x3401
1271D
Portals
data structures
,
dp
,
greedy
,
implementation
,
sortings
2100
x3054
1271C
Shawarma Tent
brute force
,
geometry
,
greedy
,
implementation
1300
x10568
1271B
Blocks
greedy
,
math
1300
x11348
1271A
Suits
brute force
,
greedy
,
math
800
x14971
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x238
1270H
Number of Components
data structures
3300
x731
1270G
Subset with Zero Sum
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x2236
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