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preface

The standard library defines many algorithms for operating sequences, mostly in algorithm and numeric files, most of which are not complex in principle, but in many cases can replace handwritten cases or even better.

This kind of algorithm function is very many, but they all have a common structure, similar parameter characteristics, so very good memory. For example, our most classic std::sort(beg, end, cmp), where beg and end are the first and last addresses, closed left and open right, can be either a C pointer or an iterator of STL linear containers. cmp is an optional function that replaces the default 4321->1234} H. set algorithm

These algorithms are relatively inexpensive, treating ordered sequences as sets and performing some set operations.

includes(beg, end, beg2, end2, cmp)set_union(beg, end, beg2, end2, dest, cmp)set_intersection(beg, end, beg2, end2, dest, cmp)set_difference(beg, end, beg2, end2, dest, cmp)set_symmetric_difference(beg, end, beg2, end2, dest, cmp)

include Determines whether the second sequence is included in the first sequence.

set_union and set_intersection find the union and intersection of sets, set_difference find functions that are only in the first set and not in the second set. set_symmetric_difference Find elements that appear only on one side. They both output the result to dest, returning the tail position of dest. used by default

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