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# Problem Tags Rating Solved
1691-D Max GEQ Sum
binary search constructive algorithms data structures +3
1800
1691-C Sum of Substrings
brute force constructive algorithms greedy +2
1400
1691-B Shoe Shuffling
constructive algorithms greedy implementation +1
1000
1691-A Beat The Odds
brute force greedy math
800
1690-G Count the Trains
binary search data structures greedy +1
2000
1690-F Shifting String
graphs math number theory +1
1700
1690-E Price Maximization
binary search greedy math +1
1500
1690-D Black and White Stripe
implementation two pointers
1000
1690-C Restoring the Duration of Tasks
data structures greedy implementation
800
1690-B Array Decrements
greedy implementation
800
1690-A Print a Pedestal (Codeforces logo?)
constructive algorithms greedy
800
1689-E ANDfinity
bitmasks brute force constructive algorithms +3
2500
1689-D Lena and Matrix
data structures dp geometry +1
1900
1689-C Infected Tree
dfs and similar dp trees
1600
1689-B Mystic Permutation
data structures greedy
900
1689-A Lex String
brute force greedy implementation +2
800
1688-C Manipulating History
constructive algorithms greedy strings
1700
1688-B Patchouli's Magical Talisman
bitmasks constructive algorithms greedy +1
800
1688-A Cirno's Perfect Bitmasks Classroom
bitmasks brute force
800
1687-F Koishi's Unconscious Permutation
fft math
3500
1687-E Become Big For Me
combinatorics constructive algorithms greedy +2
3500
1687-D Cute number
binary search brute force data structures +3
2900
1687-C Sanae and Giant Robot
binary search brute force data structures +3
2500
1687-B Railway System
constructive algorithms graphs greedy +2
1700
1687-A The Enchanted Forest
brute force greedy
1600
1686-B Odd Subarrays
dp greedy
800
1686-A Everything Everywhere All But One
greedy
800
1685-E The Ultimate LIS Problem
data structures greedy
3500
1685-D2 Permutation Weight (Hard Version)
constructive algorithms greedy
3500
1685-D1 Permutation Weight (Easy Version)
constructive algorithms dfs and similar dsu
2800
1685-C Bring Balance
brute force constructive algorithms greedy
2600
1685-B Linguistics
greedy implementation sortings +1
2000
1685-A Circular Local MiniMax
constructive algorithms greedy sortings
1100
1684-H Hard Cut
constructive algorithms dfs and similar divide and conquer +1
3400
1684-G Euclid Guess
constructive algorithms flows graph matchings +2
2800
1684-F Diverse Segments
data structures two pointers
2600
1684-E MEX vs DIFF
binary search brute force constructive algorithms +3
2100
1684-D Traps
constructive algorithms greedy sortings
1700
1684-C Column Swapping
brute force constructive algorithms greedy +2
1400
1684-B Z mod X = C
constructive algorithms math
800
1684-A Digit Minimization
constructive algorithms games math +1
800
1682-F MCMF?
data structures flows graphs +3
2700
1682-E Unordered Swaps
constructive algorithms dfs and similar graphs +4
2700
1682-D Circular Spanning Tree
constructive algorithms implementation trees
2000
1682-C LIS or Reverse LIS?
constructive algorithms greedy implementation +1
1400
1682-B AND Sorting
bitmasks constructive algorithms sortings
1100
1682-A Palindromic Indices
greedy strings
800
1681-F Unique Occurrences
data structures dfs and similar divide and conquer +3
2300
1681-E Labyrinth Adventures
data structures dp matrices +1
2600
1681-D Required Length
brute force dfs and similar dp +2
1700