事实上,我们可以使用 std::vector 中的 push_back 和 pop_back 这两个操作来模拟一个栈,我们不妨来对比一下这个 std::vector 与我们所实现的内存池在性能上谁高谁低,我们在 主函数中加入如下代码: // 比较内存池和 std::vector 之间的性能 std::vector<int> stackVector; start = clock; for(int j =...
1、定义vector<vector<int>> A;//错误的定义方式vector<vector<int> > A;//正缺的定义方式2、插入元素若想定义A = [[0,1,2],[3,4,5]],则://正确的插入方式vector<vector<int> > A;//A.push_back里必须是vectorvector<int> B;B.push_back(0);B.push_back(1);B.push_back(2);A.push_ba...
#10 0x0000000000401595 in std::vector<int, std::allocator<int> >::_M_range_check (this=0x7f35b2851e60, __n=1) at /usr/include/c++/4.8.2/bits/stl_vector.h:794 #11 0x0000000000401313 in std::vector<int, std::allocator<int> >::at (this=0x7f35b2851e60, __n=1) at /usr/includ...
boolfindNumberIn2DArray(vector<vector<int>>& matrix,inttarget) {introws =matrix.size();if(rows ==0)returnfalse;intcols = matrix[0].size();if(cols ==0)returnfalse;returnbinarySearch(matrix, target,0, cols -1, rows, cols); }
std::vector<_Ty,_A >::clear(); } }; 调用代码 CTestVector<int> vv; vv.clear(); 出差提示: 'std::vector<int,class std::allocator<int> >::clear' : illegal call of non-static member function 解决方法 template<class _Ty, class _A = std::allocator<_Ty> > ...
std::vector<_Ty,_A>::clear(); } }; 1. 2. 3. 4. 5. 6. 7. 8. 9. 调用代码 CTestVector<int> vv; vv.clear(); 出差提示: 'std::vector<int,class std::allocator<int> >::clear' : illegal call of non-static member function ...
Complexity Constant. Example The following code usessizeto display the number of elements in astd::vector<int>: Run this code #include <cassert>#include <vector>intmain(){std::vector<int>nums;assert(nums.size()==0);nums={1,2,3,4};assert(nums.size()==4);} ...
std::vector<T,Allocator>:: size_type size()const; (C++11 起为 noexcept) (C++20 起为constexpr) 返回容器中的元素数,即std::distance(begin(), end())。 参数 (无) 返回值 容器中的元素数量。 复杂度 常数。 示例 下列代码用size显示std::vector<int>中的元素数:...
std::vector<T,Allocator>::push_back std::vector<T,Allocator>::assign std::vector<T,Allocator>::get_allocator std::vector<T,Allocator>::operator[] std::vector<T,Allocator>::front std::vector<T,Allocator>::at std::vector<T,Allocator>::pop_back std::vector<T,Allocator>::end, std::...
vector() : vector(Allocator()) {} (since C++11) (until C++17) vector() noexcept(noexcept(Allocator())) : vector(Allocator()) {} (since C++17) (constexpr since C++20) (2) explicit vector( const Allocator& alloc = Allocator() ); (until C++11) explicit vector( const Allocator&...