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# Problem Tags Rating Solved
878-A Short Program
bitmasks constructive algorithms
1600
877-F Ann and Books
data structures flows hashing
2300
877-E Danil and a Part-time Job
bitmasks data structures trees
2000
877-D Olya and Energy Drinks
data structures dfs and similar graphs +1
2100
877-C Slava and tanks
constructive algorithms
1600
877-B Nikita and string
brute force dp
1500
877-A Alex and broken contest
implementation strings
1100
876-B Divisiblity of Differences
implementation math number theory
1300
876-A Trip For Meal
math
900
875-F Royal Questions
dsu graphs greedy
2500
875-E Delivery Club
binary search data structures dp
2600
875-D High Cry
binary search bitmasks combinatorics +2
2200
875-C National Property
2-sat dfs and similar graphs +1
2100
875-B Sorting the Coins
dsu implementation sortings +1
1500
875-A Classroom Watch
brute force math
1200
873-F Forbidden Indices
dsu string suffix structures strings
2400
873-E Awards For Contestants
brute force data structures dp
2300
873-D Merge Sort
constructive algorithms divide and conquer
1800
873-C Strange Game On Matrix
greedy two pointers
1600
873-B Balanced Substring
dp implementation
1500
873-A Chores
implementation
800
871-E Restore the Tree
graphs greedy trees
2900
870-F Paths
data structures number theory
2700
870-E Points, Lines and Ready-made Titles
dfs and similar dsu graphs +1
2300
870-D Something with XOR Queries
brute force interactive probabilities
2000
870-C Maximum splitting
dp greedy math +1
1300
870-B Maximum of Maximums of Minimums
greedy
1200
870-A Search for Pretty Integers
brute force implementation
900
869-E The Untended Antiquity
data structures hashing
2400
869-D The Overdosing Ubiquity
brute force dfs and similar graphs
2800
869-C The Intriguing Obsession
combinatorics dp math
1800
869-B The Eternal Immortality
math
1100
869-A The Artful Expedient
brute force implementation
1100
868-G El Toll Caves
math
3300
868-F Yet Another Minimization Problem
divide and conquer dp
2500
868-E Policeman and a Tree
dp graphs trees
2700
868-D Huge Strings
bitmasks brute force dp +2
2200
868-C Qualification Rounds
bitmasks brute force constructive algorithms +1
1500
868-B Race Against Time
implementation
1400
868-A Bark to Unlock
brute force implementation strings
900
867-A Between the Offices
implementation
800
865-G Flowers and Chocolate
combinatorics math matrices
3300
865-F Egg Roulette
bitmasks brute force divide and conquer +2
3300
865-E Hex Dyslexia
bitmasks brute force dp +1
3300
865-D Buy Low Sell High
constructive algorithms data structures greedy
2400
865-C Gotta Go Fast
binary search dp
2400
865-B Ordering Pizza
binary search sortings ternary search
1900
865-A Save the problem!
constructive algorithms
1400
864-F Cities Excursions
dfs and similar graphs trees
2700
864-E Fire
dp sortings
2000