class Vector3 { public: Vector3(); Vector3(double x,double y,double z); public: Vector3 operator+(const Vector3 &A)const; Vector3 operator++(); friend Vector3 operator-(const Vector3 &v1, const Vector3 &v2); friend Vector3 operator--(Vector3 &v); void display()const; private: double m_x; double m_y; double m_z; }; Vector3::Vector3() :m_x(0.0), m_y(0.0), m_z(0.0) {} Vector3::Vector3(double x, double y,double z) : m_x(x), m_y(y), m_z(z) {} //运算符重载 Vector3 Vector3::operator+(const Vector3 &A) const { Vector3 B; B.m_x = this->m_x + A.m_x; B.m_y = this->m_y + A.m_y; B.m_z = this->m_z + A.m_z; return B; } Vector3 Vector3::operator++() { this->m_x ++; this->m_y ++; this->m_z ++; return *this; } void Vector3::display()const { cout<<"(" << m_x << "," << m_y << "," << m_z << ")" << endl; } Vector3 operator-(const Vector3 &v1,const Vector3 &v2) { Vector3 B(v1.m_x - v2.m_x, v1.m_y - v2.m_y, v1.m_z - v2.m_z); return B; } Vector3 operator--( Vector3 &v) { v.m_x--; v.m_y--; v.m_z --; return v; } int main() { Vector3 v1(1, 2, 3); Vector3 v2(2, 3, 2); ++v1;//v1.operator++(); 作为类成员函数可以显式调用 v1.display(); --v2; v2.display(); Vector3 v3 = v1 + v2;// v1.operator+(v2);作为类成员函数可以显式调用 v3.display(); Vector3 v4 = v1 - v2; v4.display(); return 0; }分析一下这段代码，可以将两个友元函数改为类成员函数吗？

如下类的定义，根据已有代码，把类的定义补充完整，即定义出拷贝构造函数和析构函数。class Vector{public: Vector(int s=100); Vector(Vector &v); ~Vector();Protected: int size; int buffer;};Vector::Vector(int s){ buffer=new int[size=s]; for(int i=0; i<size; i++) buffer[i]=ii;}

class Vector{public: Vector(int s=100); Vector(Vector const &v); ~Vector(); //析构函数 Vector& operator=(Vector const&); double& operator[](int i); int size() const; //其他成员函数私有变量private: ...

namespace trajectory { class LinearPath { public: LinearPath() = default; ~LinearPath() noexcept = default; void setPoints(const Eigen::Vector3d iniP, const Eigen::Vector3d endP); Eigen::Vector3d getP(const double s); Eigen::Vector3d getDeri(const double s); protected: LinearPath(const LinearPath &) = default; LinearPath &operator=(const LinearPath &) = default; LinearPath(LinearPath &&) noexcept = default; LinearPath &operator=(LinearPath &&) noexcept = default; private: mathematica::Line _line; };

好的，我现在需要处理用户关于C++中... $$ \text{距离} = \sqrt{(x_1-x_0)^2 + (y_1-y_0)^2 + (z_1-z_0)^2} $$ 3. **Mathematica兼容性**：生成Wolfram语言的标准Line表达式，可直接用于Graphics3D可视化 ---

std::vector + std::pair 用find_if

}###示例3：使用函数指针（简单情况）如果比较逻辑简单且不需要参数，可以使用函数指针。但注意，函数指针无法捕获上下文，所以比较条件必须固定（或者在函数内部通过静态变量等方式传递，但这不够灵活）。cpp...

C++标准库深度解码：从std::vector到std::map的全面剖析（全面升级版）

本文对C++标准库中的关键组件进行了深入探讨，重点分析了std::vector和std::map两种容器的内部实现细节、应用和性能优化。通过对std::vector的内存管理、迭代器失效问题以及高级特性的详细阐述，帮助读者更有效地...

每个二维向量可通过二维坐标（ x , y ）表示，二维向量可执行加减等运算。设计一个二维向量类（每个二维向量可用 x , y 坐标表示），并测试类的功能。类的基本结构如下： class Vector2d public ://构造函数 /／自己扩充类的功能 private : double x , y ;/／向量坐标二维向量类的其它部分自己设计，但至少要包括四个重载运算符函数，即"+","-""<<",">>"，使之能用于二维向量的加减和二维向量的输入输出。其中"+"运算符重载函数和"-"运算符重载函数分别设计为成员函数和友元函数。

Vector2d(double x_, double y_) : x(x_), y(y_) {} //构造函数 Vector2d operator+(const Vector2d& vec) const; //重载加法运算符 Vector2d operator-(const Vector2d& vec) const; //重载减法运算符 friend ...

#include <iostream> #include <vector> #include <algorithm> #include <string> using namespace std; class Shape { public: virtual double getArea() = 0; virtual string getName() = 0; void setWidth(double w) { width = w; } void setHeight(double h) { height = h; } protected: double width; double height; }; class Rectangle: public Shape { public: double getArea() { return (width * height); } string getName() { return "矩形"; } }; class Triangle: public Shape { public: double getArea() { return (width * height)/2; } string getName() { return "三角形"; } }; template<typename T> double getTotalArea(vector<T>& shapes) { double total = 0; for (typename vector<T>::iterator it = shapes.begin(); it != shapes.end();++it) { total += it->getArea(); } return total; } class CompareShapes { public: bool operator()(Shape a, Shape* b) { return a->getArea() < b->getArea(); } }; int main() { vector<Shape*> shapes; Rectangle rect1; rect1.setWidth(5); rect1.setHeight(7); Rectangle rect2; rect2.setWidth(3); rect2.setHeight(4); Triangle tri1; tri1.setWidth(5); tri1.setHeight(7); Triangle tri2; tri2.setWidth(3); tri2.setHeight(4); shapes.push_back(&rect1); shapes.push_back(&rect2); shapes.push_back(&tri1); shapes.push_back(&tri2); cout << "图形集合的总面积为：" << getTotalArea(shapes) << endl; sort(shapes.begin(), shapes.end(), CompareShapes()); cout << "图形集合中面积最大的图形是：" << shapes.back()->getName() << endl; return 0; }此段代码有错误不能运行，，请帮忙改正

double getTotalArea(vector<T>& shapes) { double total = 0; for (typename vector<T>::iterator it = shapes.begin(); it != shapes.end(); ++it) { total += (*it)->getArea(); } return total; } class ...

#ifndef _ASTAR_H #define _ASTAR_H #include <global_planner/planner_core.h> #include <global_planner/expander.h> #include <vector> #include <algorithm> namespace global_planner { class Index { public: Index(int a, float b) { i = a; cost = b; } int i; float cost; }; struct greater1 { bool operator()(const Index& a, const Index& b) const { return a.cost > b.cost; } }; class AStarExpansion : public Expander { public: AStarExpansion(PotentialCalculator* p_calc, int nx, int ny); virtual ~AStarExpansion() {} bool calculatePotentials(unsigned char* costs, double start_x, double start_y, double end_x, double end_y, int cycles, float* potential); private: void add(unsigned char* costs, float* potential, float prev_potential, int next_i, int end_x, int end_y); std::vector<Index> queue_; }; } //end namespace global_planner #endif

接受一个unsigned char指针对象costs、四个double类型的起始点和终止点坐标、一个整数cycles和一个float类型指针对象potential作为参数。成员变量： - queue_：存储待扩展的节点的优先级队列。另外，在代码中还...

#include <iostream> #include <vector> #include <algorithm> #include <string> using namespace std; // 定义一个基类Shape class Shape { public: virtual double getArea() = 0; // 纯虚函数 virtual string getName() = 0; // 纯虚函数 void setWidth(double w) { width = w; } void setHeight(double h) { height = h; } protected: double width; double height; }; // 定义派生类Rectangle class Rectangle: public Shape { public: double getArea() { return (width * height); } string getName() { return "矩形"; } }; // 定义派生类Triangle class Triangle: public Shape { public: double getArea() { return (width * height)/2; } string getName() { return "三角形"; } }; // 定义一个模板函数，用于计算图形集合的总面积 template<typename T> double getTotalArea(vector<T>& shapes) { double total = 0; for (typename vector<T>::iterator it = shapes.begin(); it != shapes.end();++it) { total += it ->getArea(); } return total; } // 定义一个函数对象，用于比较两个图形的面积大小 class CompareShapes { public: bool operator()(Shape* a, Shape* b) { return a->getArea() < b->getArea(); } }; int main() { vector<Shape*> shapes; Rectangle rect1; rect1.setWidth(5); rect1.setHeight(7); Rectangle rect2; rect2.setWidth(3); rect2.setHeight(4); Triangle tri1; tri1.setWidth(5); tri1.setHeight(7); Triangle tri2; tri2.setWidth(3); tri2.setHeight(4); shapes.push_back(&rect1); shapes.push_back(&rect2); shapes.push_back(&tri1); shapes.push_back(&tri2); // 输出图形集合的总面积 cout << "图形集合的总面积为：" << getTotalArea(shapes) << endl; // 对图形集合进行排序 sort(shapes.begin(), shapes.end(), CompareShapes()); // 输出图形集合中面积最大的图形的名称 cout << "图形集合中面积最大的图形是：" << shapes.back()->getName() << endl; return 0; }检查这段代码为什么出错

double getTotalArea(vector<T>& shapes) { double total = 0; for (typename vector<T>::iterator it = shapes.begin(); it != shapes.end();++it) { total += it ->getArea(); } return total; } // 定义一...

6-4 矩阵与向量的乘法分数 25 作者董卫萍单位绍兴文理学院元培学院矩阵与向量相乘：当矩阵的列数与向量的行数相等时，用矩阵的第i行乘以向量，并输出结果向量，否则输出"Bad multiplying Matrix with Vector."。函数接口定义： int& Matrix::operator()(int i,int j); ostream& operator<<(ostream& out,const Vector& x); Vector operator(Matrix& mat,Vector& vex); int& Matrix::operator()(int i,int j)：返回第i行第j列的矩阵元素（可作左值），应有下标越界检查，如果越界则输出信息"Matrix index out of range."； ostream& operator<<(ostream& out,const Vector& x)：将向量x输出到输出流out对象。为能达到连续输入对象的效果，设置返回类型为引用； Vector operator(Matrix& mat,Vector& vex)：参数为矩阵mat、向量vex，返回二者的乘积。裁判测试程序样例： #include<iostream> #include<cstring> using namespace std; class Matrix; //类的向前声明 class Vector { private: int* v; int sz; public: Vector(int n) { v=new int[sz=n]; } Vector(const Vector& t) { v=new int[sz=t.sz]; memcpy(v,t.v,szsizeof(int)); //深拷贝 } ~Vector() { delete []v; } int& operator[](int i) { if(i>=0 &&i<sz) //下标越界检查 return v[i]; else { cout<<"Vector index out of range.\n"; exit(0); } } friend ostream& operator<<(ostream& out,const Vector& x); friend Vector operator(Matrix& m,Vector& v);//重载乘法运算符 }; class Matrix { private: int* m; int szl,szr; public: Matrix(int a,int b) { szl=a; szr=b; m=new int[ab]; //用一维数组模拟矩阵 } ~Matrix() { delete []m; } int& operator()(int i,int j) ; friend Vector operator(Matrix& m,Vector& v); }; int main() { int n,m; cin>>n>>m; Matrix ma(n,m); for(int i=0; i<n; i++) for(int j=0; j<m; j++) cin>>ma(i,j); cin>>n; Vector ve(n); for(int i=0; i<n; i++) cin>>ve[i]; Vector va = ma * ve; cout<<va<<endl; return 0; } /* 请在这里填写答案 / 输入样例：在这里给出一组输入。输入矩阵的行、列数n,m，其后输入矩阵的nm个元素，接着输入向量的大小t，其后输入向量的t个元素，例如： 4 3 1 2 3 0 1 2 1 1 3 1 2 1 3 2 1 0 输出样例：在这里给出相应的

好的，我现在需要解决用户的问题：如何在C++中通过类和运算符重载实现矩阵与向量的乘法，包括Matrix和Vector类的设计及operator*的定义。首先，我得回顾一下用户提供的引用资料，看看有没有相关的实现可以参考。 ...

每个二维向量可通过二维坐标(x,y)表示，二维向量可执行加减等运算。设计一个二维向量类（每个二维向量可用x，y坐标表示），并测试类的功能。类的基本结构如下： class Vector2d { public： // 构造函数 //自己扩充类的功能 private: double x,y; //向量坐标 }; 二维向量类的其它部分自己设计，但至少要包括四个重载运算符函数，即“+”，“-”“<<”，“>>”，使之能用于二维向量的加减和二维向量的输入输出。其中“＋”运算符重载函数和“-”运算符重载函数分别设计为成员函数和友元函数。

Vector2d(double x = 0.0, double y = 0.0) : x(x), y(y) {} // 构造函数 // 友元函数，实现二维向量的加法 friend Vector2d operator+(const Vector2d& v1, const Vector2d& v2) { return Vector2d(v1.x + v2....

#include <iostream.h> class CComplex { public: CComplex(double r = 0, double i = 0) { real = r; imag = i; } int operator int() { return (int)real; } void Display(void) { cout << "(" << real << "," << imag << ")" << endl; } protected: double real; double imag; }; class CVector { public: CVector(CComplex &obj1, CComplex &obj2, CComplex &obj3, CComplex &obj4) { objArray[0] = obj1; objArray[1] = obj2; objArray[2] = obj3; objArray[3] = obj4; } friend CComplex &operator[](CVector obj, int n); private: CComplex objArray[4]; }; CComplex &operator[](CVector obj, int n) { if(n<0 || n>3) { cout<<"Out of range!"<<endl; exit(0); } return obj.objArray[n]; } int main() { CComplex c1(1.1, 1.1); CComplex c2(2.2, 2.2); CComplex c3(3.3, 3.3); CComplex c4(4.4, 4.4); CVector v(c1,c2,c3,c4); v[0].Display(); v[1].Display(); v[2].Display(); v[3].Display(); v[0] = 5.5; ----------------------------------------------------------① v[1] = CComplex(6.6); -------------------------------------------② v[2] = int(CComplex(7.7)); --------------------------------------③ v[3] = int(CComplex(8.8,9.9)); ----------------------------------④ v[0].Display(); v[1].Display(); v[2].Display(); v[3].Display(); return 0; } 问题一：上述程序存在两大错误，在不修改主函数和程序原意的前提下，改正该程序中存在的错误。问题二：①处的转换属于显式转换还是隐式转换，并解释该转换过程。问题三：②处的转换属于显式转换还是隐式转换，并解释该转换过程。问题四：解释③处的转换过程。问题五：解释④处的转换过程。

将CComplex(7.7)转换为int类型的值，首先调用CComplex类的构造函数CComplex(double r = 0, double i = 0)，将7.7作为实部，0作为虚部构造一个CComplex类型的值，然后调用CComplex类中重载的operator int()运算符，将...

2、理解下面的程序，并运行查看结果，回答程序后面的问题。 #include <iostream.h> class CComplex { public: CComplex(double r = 0, double i = 0) { real = r; imag = i; } int operator int() { return (int)real; } void Display(void) { cout << "(" << real << "," << imag << ")" << endl; } protected: double real; double imag; }; class CVector { public: CVector(CComplex &obj1, CComplex &obj2, CComplex &obj3, CComplex &obj4) { objArray[0] = obj1; objArray[1] = obj2; objArray[2] = obj3; objArray[3] = obj4; } friend CComplex &operator[](CVector obj, int n); private: CComplex objArray[4]; }; CComplex &operator[](CVector obj, int n) { if(n<0 || n>3) { cout<<"Out of range!"<<endl; exit(0); } return obj.objArray[n]; } int main() { CComplex c1(1.1, 1.1); CComplex c2(2.2, 2.2); CComplex c3(3.3, 3.3); CComplex c4(4.4, 4.4); CVector v(c1,c2,c3,c4); v[0].Display(); v[1].Display(); v[2].Display(); v[3].Display(); v[0] = 5.5; ----------------------------------------------------------① v[1] = CComplex(6.6); -------------------------------------------② v[2] = int(CComplex(7.7)); --------------------------------------③ v[3] = int(CComplex(8.8,9.9)); ----------------------------------④ v[0].Display(); v[1].Display(); v[2].Display(); v[3].Display(); return 0; } 问题一：上述程序存在两大错误，在不修改主函数和程序原意的前提下，改正该程序中存在的错误。问题二：①处的转换属于显式转换还是隐式转换，并解释该转换过程。问题三：②处的转换属于显式转换还是隐式转换，并解释该转换过程。问题四：解释③处的转换过程。问题五：解释④处的转换过程。

2. 在 CVector 类中的友元函数 operator[] 中，应该传入一个 CVector 对象的引用，而不是一个值传递的 CVector 对象。修改后的代码如下： cpp #include using namespace std; class CComplex { public: ...

class Config { public: using Ptr_=std::shared_ptr<Config>; private: Config() = default; Config(Config &&) = delete; Config(const Config &)= delete; Config &operator=(Config &&)= delete; Config &operator=(const Config &)= delete; static Ptr_ config_info_; std::map<std::string, std::string> storage_; public: ~Config() = default; public: static Ptr_ GetInstance(); bool Open(std::string config_file); template <typename T> T Get(std::string key){ transform(key.begin(),key.end(),key.begin(),::tolower); // 转小写 if(storage_.count(key)>0){ try{ double value=stod(storage_[key]); return static_cast<T>(value); } catch (const std::exception &e){ std::cerr<<e.what()<<'\n'; } } else{ // LOG(ERROR)<<"The key of "<<key<<" does not exist"; // getchar(); return T(0x0); } } template <typename T> std::vector<T> GetArray(std::string key){ std::vector<T> data; transform(key.begin(),key.end(),key.begin(),::tolower); // 转小写 if(storage_.count(key)>0){ try{ auto text=TextSplit(storage_[key],","); for(auto index:text){ double value=stod(index); data.emplace_back(static_cast<T>(value)); } } catch(const std::exception &e){ std::cerr<<e.what()<<'\n'; } } else{ // LOG(ERROR)<<"The key of "<<key<<" does not exist"; // getchar(); } return data; } };

- 移动赋值运算符operator=(Config &&)和拷贝赋值运算符operator=(const Config &)也被禁用，使用= delete来实现。 - 静态成员变量config_info_是一个指向Config类实例的共享指针。 - storage_是一个...

#include <vector> #include <cmath> #include <iostream> struct Point3d { double x, y, z; }; bool adjustPointsIterative(std::vector& vec, double min_dist = 5.0, int max_iters = 100) { const double min_dist_sq = min_dist * min_dist; bool adjusted = false; for (int iter = 0; iter < max_iters; ++iter) { bool current_adjusted = false; for (size_t i = 0; i < vec.size(); ++i) { for (size_t j = i + 1; j < vec.size(); ++j) { Point3d& p1 = vec[i]; Point3d& p2 = vec[j]; double dx = p2.x - p1.x; double dy = p2.y - p1.y; double dz = p2.z - p1.z; double dist_sq = dxdx + dydy + dzdz; if (dist_sq < min_dist_sq && dist_sq > 0) { double dist = std::sqrt(dist_sq); double delta = (min_dist - dist) / dist; double move_x = dx delta * 0.5; double move_y = dy * delta * 0.5; double move_z = dz * delta * 0.5; p1.x -= move_x; p1.y -= move_y; p1.z -= move_z; p2.x += move_x; p2.y += move_y; p2.z += move_z; current_adjusted = true; } } } if (!current_adjusted) break; // 无调整则提前退出 adjusted = true; } return adjusted; } int main() { std::vector points = {{0,0,0}, {3,0,0}, {1,1,0}}; adjustPointsIterative(points); for (const auto& p : points) { std::cout << "(" << p.x << ", " << p.y << ", " << p.z << ")\n"; } return 0; }使用八叉树或网格划分空间，仅检测相邻区域内的点对。

struct Point3d { double x, y, z; }; using GridKey = std::tuple, int, int>; struct GridHash { size_t operator()(const GridKey& k) const { auto hash_int = std::hash(); return hash_int(std::get(k)) ...

#include <uf_defs.h> #include <NXOpen/NXException.hxx> #include <NXOpen/Session.hxx> #include <NXOpen/BasePart.hxx> #include <NXOpen/DisplayableObject.hxx> #include <NXOpen/Expression.hxx> #include <NXOpen/ExpressionCollection.hxx> #include <NXOpen/MeasureManager.hxx> #include <NXOpen/Part.hxx> #include <NXOpen/PartCollection.hxx> #include <NXOpen/Point.hxx> #include <NXOpen/PointCollection.hxx> #include <NXOpen/Scalar.hxx> #include <NXOpen/ScalarCollection.hxx> #include <NXOpen/Session.hxx> #include <NXOpen/Sketch.hxx> #include <NXOpen/SmartObject.hxx> #include <NXOpen/Unit.hxx> #include <NXOpen/UnitCollection.hxx> #include "NXopenHxx.h" // We are currently testing removal of using namespace NXOpen. // Uncomment the below line if your journal does not compile. // using namespace NXOpen; #include "PK/parasolid_debug.h" #include "PK/parasolid_ifails.h" #include "PK/parasolid_kernel.h" #include "PK/parasolid_tokens.h" #include "PK/parasolid_typedefs.h" #pragma comment(lib,"PK/pskernel.lib") using namespace NXOpen; using namespace NXOpen::BlockStyler; // 尺寸标注数据结构（扩展包围框信息） struct DiamDimData { tag_t diamTag; Point2d position; // 标注中心 Point2d halfSize; // 包围盒半尺寸 Point2d lineStart; // 尺寸线起点 Point2d lineEnd; // 尺寸线终点 }; using GridKey = std::tuple<int, int>; struct GridHash { size_t operator()(const GridKey& k) const { auto hash_int = std::hash<int>(); size_t h1 = hash_int(std::get<0>(k)); size_t h2 = hash_int(std::get<1>(k)); return h1 ^ (h2 << 16) ^ (h2 >> 16); } }; class aTest { public: std::vector<DiamDimData> g_Dimensions; void aTest::creatDarwPoint(double point[2]); bool askCylEdges(tag_t faceListTag, double dimOrigin[3], tag_t cylEdgesTag); std::vector<tag_t> askCylEdges1(tag_t bodyTag, std::map<tag_t, Point3d>& mapDimPoint); NXObject* CreateBaseView(Point3d TopDwgPoint, double iScale, Direction* iDirection1, Direction* iDirection2); void pkFindBox(tag_t object_tag); void askBoxDist(std::vector<TaggedObject> objs, bool isUsedCsys, double minCon[3], double maxCon[3], double zCenter[3], double dist[3]); bool createBlock_pk(double org[3], double dir[3][3], double dis[3], tag_t& body_tag); void createBox(std::vector<TaggedObject> objs, double offset, bool isUsedCsys); double getMinDistInterop(tag_t obj1, tag_t obj2); void askDarwMinMaxPoint(tag_t bodySolid, tag_t point[5]); tag_t createHorizontalDim(tag_t dimPoint1, tag_t dimPoint2, tag_t draw_view_tag, double dimension3dOrigin[3]); tag_t createRadiusDim(tag_t dimCylDim1, tag_t drawViewTag, double ptStatus[2]); tag_t createDiameterDim(tag_t dimCylDim1, tag_t drawViewTag, double ptStatus[2]); tag_t createVerticalDim(tag_t dimPoint1, tag_t dimpoint2, tag_t drawViewTag, double dim3DOrigin[3]); vector<tag_t> GetInstanceBodies(tag_t compTag); double distanceToLineSegment(const Point2d& p, const Point2d& a, const Point2d& b); bool checkLineOverlap(const DiamDimData& dim, double minGap); void adjustOffDimensionLine(DiamDimData& dim, double minGap); void buildSpatialGrid(const std::vector<DiamDimData>& dimensions, std::unordered_map<GridKey, std::vector<size_t>, GridHash>& gridMap, double cellSize); bool checkOverlap(const DiamDimData& a, const DiamDimData& b, double minGap); //void buildSpatialGrid(const std::vector<DiamDimData>& dimensions, std::unordered_map<GridKey, std::vector<size_t>, GridHash>& gridMap, double cellSize); void adjustDimensionPositions(std::vector<DiamDimData>& dimensions, double minGap, int maxIterations); void removeDiamDim(tag_t cylDiamTag, Point2d reMovePoint); tag_t createDim(tag_t darwView, tag_t cylFaceTag, double dimOrigin[2]); }; 以上怎么安全的在其他cpp中调用

double origin[3] = {0.0, 0.0, 0.0}; tag_t viewTag = ...; // 从NX Open获取有效的视图标签 tag_t dimTag = testObj.createHorizontalDim(..., viewTag, origin); } --- ### **7. 代码修正建议** - **...

#include<cstdio> #include<cstring> #include<algorithm> #include<cmath> using namespace std; const int maxn=10000+5; const double eps=1e-10; int dcmp(double x) { if(fabs(x)<eps) return 0; return x<0?-1:1; }struct Point { double x,y; int id; Point(){} Point(double x,double y,int id):x(x),y(y),id(id){} }P[maxn]; typedef Point Vector; Vector operator-(Point A,Point B) { return Vector(A.x-B.x,A.y-B.y,0); }double Cross(Vector A,Vector B) { return A.xB.y-A.yB.x; }bool cmp(Point A,Point B) { return dcmp(Cross(A-P[0],B-P[0]))<0; }int main() { int n; while(scanf("%d",&n)==1) { scanf("%lf%lf",&P[0].x,&P[0].y); P[0].id=1; for(int i=1;i<n;++i) { scanf("%lf%lf",&P[i].x,&P[i].y); P[i].id=i+1; if(P[i].x<P[0].x || (P[i].x==P[0].x && P[i].y<P[0].y) ) swap(P[0],P[i]); }sort(P+1,P+n,cmp); printf("%d %d\n",P[0].id,P[n/2].id); }return 0; }转为Java代码

public Vector(double x, double y) { this.x = x; this.y = y; } } static Vector minus(Point A, Point B) { return new Vector(A.x - B.x, A.y - B.y); } static double Cross(Vector A, Vector B) { ...

将Student类作为基类，派生出本科生类（UnderGraduated）和研究生类（Graduated）， class UnderGraduated : public Student { public: //请定义构造函数 //请定义析构函数 double tuition() { cout << “本科生学费” << endl; } //重载运算符<<，实现本科生信息的输出，请定义。 friend ostream& operator<<(ostream& o, UnderGraduated& s); }; class Graduated : public Student { private: string tutor; //导师姓名 public: //请定义构造函数 //请定义析构函数 void setTutor(string t) { tutoe = t; } string getTutor() { return tutor; } //重载运算符<<，实现研究生信息的输出，请定义。 friend ostream& operator<<(ostream& o, Graduated& s); }; 要求： (1) 根据需要可以更改Student数据成员的访问属性； (2) 考虑能否直接使用myList对本科生和研究生进行统一管理，若不能，分析原因，有无解决方法。 2、使用模板方法重新定义myList，实现相同的功能。

class myList { private: vector*> v; public: void add(T* obj) { v.push_back(obj); } void remove(T* obj) { //查找obj在v中的位置，如果找到，就删除 typename vector*>::iterator it; for (it = v....

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