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class SlidingWindow { | |
public: | |
explicit SlidingWindow(size_t least_docnum) : least_docnum_(least_docnum) {} | |
size_t Add(size_t lcp_len, uint64_t docid) { | |
docid_queue_.Push(docid); | |
lcp_len_queue_.Push(lcp_len); | |
if (docid_queue_.Cardinality() >= least_docnum_) { // enough docs | |
while (docid_queue_.Cardinality() >= least_docnum_) Shrink(); | |
// LCP DOCID SEQUENCE Pre-Shrink Window Shrinked Window | |
// 0 1 AXXXX | | |
// 1 0 ABCDX | | |
// 4 1 ABCDY | | | |
// 3 2 ABCZ | | | |
// expected is 3 | |
// LCPの先頭は無視したいので「条件を満たさなくなる直前」ではなくて、1つ進めた「条件を満たさなくなった直後」でLCPの最小値を取る。 | |
return lcp_len_queue_.Min(); | |
} | |
return 0; // not enough docs | |
} | |
private: | |
void Shrink() { | |
docid_queue_.Pop(); | |
lcp_len_queue_.Pop(); | |
} | |
size_t least_docnum_; | |
CardinalityQueue<size_t> docid_queue_; | |
MinQueue<size_t> lcp_len_queue_; | |
}; |
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