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# Problem Tags Rating Solved
1271-B Blocks
greedy math
1300
1271-A Suits
brute force greedy math
800
1270-I Xor on Figures
constructive algorithms fft math
3500
1270-H Number of Components
data structures
3300
1270-G Subset with Zero Sum
constructive algorithms dfs and similar graphs +1
2700
1270-F Awesome Substrings
math strings
2600
1270-E Divide Points
constructive algorithms geometry math
2300
1270-D Strange Device
constructive algorithms interactive math +1
1900
1270-C Make Good
bitmasks constructive algorithms math
1400
1270-B Interesting Subarray
constructive algorithms greedy math
1200
1270-A Card Game
games greedy math
800
1269-B Modulo Equality
brute force sortings
1500
1269-A Equation
brute force math
800
1268-E Happy Cactus
dp
3400
1268-D Invertation in Tournament
brute force divide and conquer graphs +1
3200
1268-C K Integers
binary search data structures
2300
1268-B Domino for Young
dp greedy math
2000
1268-A Long Beautiful Integer
constructive algorithms greedy implementation +1
1700
1267-L Lexicography
constructive algorithms strings
1800
1267-K Key Storage
combinatorics math
2100
1267-J Just Arrange the Icons
greedy implementation math
1800
1267-I Intriguing Selection
brute force constructive algorithms implementation +2
2600
1267-H Help BerLine
constructive algorithms
3200
1267-G Game Relics
math probabilities
3000
1267-F Foolprüf Security
graphs
2600
1267-E Elections
greedy
1700
1267-D DevOps Best Practices
constructive algorithms
2800
1267-C Cactus Revenge
constructive algorithms
3500
1267-B Balls of Buma
900
1267-A Apprentice Learning Trajectory
2400
1266-H Red-Blue Graph
dp graphs math +2
3400
1266-G Permutation Concatenation
string suffix structures
3300
1266-F Almost Same Distance
dfs and similar graphs
2900
1266-E Spaceship Solitaire
data structures greedy implementation
2100
1266-D Decreasing Debts
constructive algorithms data structures graphs +4
2000
1266-C Diverse Matrix
constructive algorithms greedy math +1
1400
1266-B Dice Tower
constructive algorithms math
1000
1266-A Competitive Programmer
chinese remainder theorem math
1000
1265-E Beautiful Mirrors
data structures dp math +1
2100
1265-B Beautiful Numbers
data structures implementation math +1
1300
1265-A Beautiful String
constructive algorithms greedy
1000
1264-F Beautiful Fibonacci Problem
constructive algorithms number theory
3500
1264-E Beautiful League
constructive algorithms flows graph matchings
2700
1264-D2 Beautiful Bracket Sequence (hard version)
combinatorics probabilities
2900
1264-D1 Beautiful Bracket Sequence (easy version)
combinatorics dp probabilities
2600
1264-C Beautiful Mirrors with queries
data structures probabilities
2400
1264-B Beautiful Sequence
brute force constructive algorithms greedy
1900
1264-A Beautiful Regional Contest
greedy implementation
1500
1263-F Economic Difficulties
data structures dfs and similar dp +3
2400
1263-E Editor
data structures implementation
2100