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== 任意知识点 ==
schedules
chinese remainder theorem
2-sat
*special
graph matchings
meet-in-the-middle
ternary search
flows
fft
hashing
number theory
string suffix structures
two pointers
games
expression parsing
constructive algorithms
data structures
matrices
greedy
shortest paths
binary search
bitmasks
trees
strings
sortings
probabilities
geometry
math
implementation
brute force
dp
divide and conquer
combinatorics
graphs
dsu
dfs and similar
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