尽管std::upper_bound只要求[first,last)已划分,但是该算法通常会在[first,last)已排序的情况下使用,此时二分查找对于任意value都有效。 对于[first,last)中的任意迭代器iter,std::upper_bound要求value<*iter和comp(value,*iter)良构,而std::lower_bound要求*iter<value和comp(*iter, value)良构。
时间复杂度是 O(logn) lower_bound()/upper_bound()unordered_set, unordered_map, unordered_multiset, unordered_multimap, 哈希表 和上面类似,增删改查的时间复杂度是 O(1) 不支持 lower_bound()/upper_bound(), 迭代器的++,--bitset, 圧位 bitset<10000> s; ~, &, |, ^ >>, << ==, != []...
map.upper_bound(keyElem); // 返回第一个key>keyElem元素的迭代器。 例如: mapStu是用map<int,string>声明的容器,已包含{1,"小李"}{3,"小张"}{5,"小王"}{7,"小赵"}{9,"小陈"}元素。 map<int,string>::iterator it;it=mapStu.lower_bound(5);//it->first==5 it->second=="小王"it=map...
upper_bound Returns an iterator pointing to the first element in the range [first,last) which compares greater than val. Return value An iterator to the upper bound position for val in the range. If no element in the range compares greater than val, the function returns last. lower_bound ...
If we know an upper bound of the minimum distance of the code, then we have a good indication about the capabilities and the limitations of the code. One of the classes of the error correcting codes with the best performance is that of turbo codes. For such codes, establishing upper ...
const_iterator upper_bound( const K& x ) const; (4) (C++14 起) (C++26 起为 constexpr) 1,2) 返回指向首个大于 key 的元素的迭代器。3,4) 返回指向首个大于 x 的元素的迭代器。此重载只有在 Compare 透明时才会参与重载决议。它允许调用此函数时无需构造 Key 的实例。参数...
Cpp 中的 struct 不同于 C 中的 struct,cpp 的 struct 被扩展为类似 class 的类说明符。 结构体是一系列成员元素的组合体,允许存储不同类型的数据项,成员变量可以是各种数据类型,包括整数、浮点数、字符串、其他结构体等,所以你可以根据需要定义自己的结构体来组织数据。
if(work.size()<(size_t)nelements*4){21.work.resize(nelements*4);// upper bound on size22.}23.new_data=work.data();24.constint64_tn_per_row=tensor->ne[0];25.constint64_tnrows=tensor->ne[1];26.staticconstint64_tmin_chunk_size=32*512;27.constint64_tchunk_size=(n_per_row>=...
upper_bound returns an iterator to the first element greater than the given key (public member function) Observers key_comp returns the function that compares keys (public member function) value_comp returns the function that compares keys in objects of type value_type (public member...
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