(使用for loop) (中级) 初学者若想要删除std::vector内的element,第一个想到的就是用for loop,若该iterator的值是我要删的,就erase 1 // Compile OK, but run-time error!! 2 for(std::vector<int>::iterator iter = ivec.begin(); iter != ivec.end(); ++iter) { 3 if (*iter == 8) {...
初学者若想要删除std::vector内的element,第一个想到的就是用for loop,若该iterator的值是我要删的,就erase 1 //Compile OK, but run-time error!! 2 for(std::vector<int>::iterator iter=ivec.begin(); iter!=ivec.end();++iter) { 3 if(*iter==8) { 4 ivec.erase(iter); 5 } 6 } 以...
初学者若想要删除std::vector内的element,第一个想到的就是用for loop,若该iterator的值是我要删的,就erase 1 //Compile OK, but run-time error!! 2 for(std::vector<int>::iterator iter=ivec.begin(); iter!=ivec.end();++iter) { 3 if(*iter==8) { 4 ivec.erase(iter); 5 } 6 } 以...
(使用find) (C/C++) (STL) 若要删除std::vector中的element,正规的方式该用find() generic algorithm,若find()找到了,会传回该iterator,若找不到,将传回vector.end()。这种写法远比用for loop干净很多。 1/**//* 2(C) OOMusou 2006 3 4Filename : VectorFindAndErase.cpp 5Compiler : Visual C++ ...
Usingstd::find_ifto get the element iterator. Explaining inputs tostd::find_if. Check if element was found. Using the “found” iterator. Video – Finding Items In C++ Collections For demonstration purposes, I’ve posted the video below. Hopefully, you can learn by example how to find it...
insert,emplaceIf the vector changed capacity, all of them. If not, only those at or after the insertion point (includingend()). resizeIf the vector changed capacity, all of them. If not, onlyend()and any elements erased. pop_backThe element erased andend(). ...
bool compareVector(const std::vector<T> & vec1, const std::vector<T> & vec2) { if (vec1.size() != vec2.size()) return false; //Here we assuame that T is hashable ... auto count_set = std::unordered_map<T,int>(); //We count the element in each vector... for (std...
vectorcan change during runtime. It achieves this dynamic resizing through memory allocations and deallocations. When you insert an element into a vector that’s already at its capacity, the vector will allocate a new, larger block of memory, move the existing elements to this new block, and...
排序算法:STL提供了多种排序算法,如std::sort、std::partial_sort等。在选择排序算法时,要根据数据的规模和特性进行权衡。例如,对于大量数据,std::sort通常具有较好的性能;而对于只需要找到最大或最小元素的情况,std::nth_element可能更加高效。 查找算法:STL中的查找算法有std::find、std::find_if、std::searc...
...applymap就像map一样,但是是在DataFrame上以elementwise的方式工作,但由于它是由apply内部实现的,所以它不能接受字典或Series作为输入——只允许使用函数。...这肯定不能用map来实现,因为它需要按列计算,而map只能按元素计算。 如果使用熟悉apply,那么实现很简单。...总结 apply提供的灵活性使其在大多数...