A:白给的list排序
总时间限制: 1000ms 内存限制: 65536kB
描述
程序填空,产生指定输出
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <list>
using namespace std;
int main()
{
double a[] = {1.2,3.4,9.8,7.3,2.6};
list<double> lst(a,a+5);
lst.sort(
[](double a,double b){return a>b;}
);
for(list<double>::iterator i = lst.begin(); i != lst.end(); ++i)
cout << * i << "," ;
return 0;
}
输入
无
输出
9.8,7.3,3.4,2.6,1.2,
样例输入
无
样例输出
同输入
来源
Guo Wei
B:按距离排序
总时间限制: 1000ms 内存限制: 65536kB
描述
程序填空,输出指定结果
#include <iostream>
#include <cmath>
#include <algorithm>
#include <string>
using namespace std;
template <class T1,class T2>
struct Closer {
T1 n;
T2 x;
Closer(T1 nn, T2 xx){
//cout<<nn<<endl;
n=nn;x=xx;
}
bool operator()(T1 &a, T1 &b){
//cout<<a<<" "<<b<<endl;
if(x(n,a)==x(n,b)){
return a<b;
}
return x(n,a)<x(n,b);
}
};
int Distance1(int n1,int n2) {
return abs(n1-n2);
}
int Distance2(const string & s1, const string & s2)
{
return abs((int)s1.length()- (int) s2.length());
}
int a[10] = { 0,3,1,4,7,9,20,8,10,15};
string b[6] = {"American","Jack","To","Peking","abcdefghijklmnop","123456789"};
int main()
{
int n;string s;
while( cin >> n >> s ) {
sort(a,a+10,Closer<int ,int (*)(int ,int)> (n,Distance1));
for(int i = 0;i < 10; ++i)
cout << a[i] << "," ;
cout << endl;
sort(b,b+6,Closer<string,int (*)(const string &,const string & )> (s,Distance2));
for(int i = 0;i < 6; ++i)
cout << b[i] << "," ;
cout << endl;
}
return 0;
}
输入
多组数据,每组一行,是一个整数n和一个字符串s
输出
定义两个整数的距离为两个整数差的绝对值
定义两个字符串的距离为两个字符串长度差的绝对值
对每组数据:
对数组a按和n的距离从小到大排序后输出。距离相同的,值小的排在前面。
然后对数组b,按照和s的距离从小到大输出。距离相同的,字典序小的排在前面
样例输入
2 a123456
4 a12345
样例输出
1,3,0,4,7,8,9,10,15,20,
American,Peking,123456789,Jack,To,abcdefghijklmnop,
4,3,1,7,0,8,9,10,15,20,
Peking,American,Jack,123456789,To,abcdefghijklmnop,
来源
Guo Wei
C:goodcopy
总时间限制: 1000ms 内存限制: 65536kB
描述
编写GoodCopy类模板,使得程序按指定方式输出
#include <iostream>
using namespace std;
template <class T>
struct GoodCopy {
void operator()(T* start, T* end, T* aim){
int num=end-start;
T* mid=new T[num];
for(int i=0;start+i!=end;++i)
mid[i]=start[i];
for(int i=0;i<num;i++)
aim[i]=mid[i];
delete[] mid;
}
};
int a[200];
int b[200];
string c[200];
string d[200];
template <class T>
void Print(T s,T e) {
for(; s != e; ++s)
cout << * s << ",";
cout << endl;
}
int main()
{
int t;
cin >> t;
while( t -- ) {
int m ;
cin >> m;
for(int i = 0;i < m; ++i)
cin >> a[i];
GoodCopy<int>()(a,a+m,b);
Print(b,b+m);
GoodCopy<int>()(a,a+m,a+m/2);
Print(a+m/2,a+m/2 + m);
for(int i = 0;i < m; ++i)
cin >> c[i];
GoodCopy<string>()(c,c+m,d);
Print(c,c+m);
GoodCopy<string>()(c,c+m,c+m/2);
Print(c+m/2,c+m/2 + m);
}
return 0;
}
输入
第一行是整数 t,表示数据组数
每组数据:
第一行是整数 n , n < 50
第二行是 n 个整数
第三行是 n 个字符串
输出
将输入的整数原序输出两次,用","分隔
然后将输入的字符串原序输出两次,也用 ","分隔
样例输入
2
4
1 2 3 4
Tom Jack Marry Peking
1
0
Ted
样例输出
1,2,3,4,
1,2,3,4,
Tom,Jack,Marry,Peking,
Tom,Jack,Marry,Peking,
0,
0,
Ted,
Ted,
来源
Guo Wei
D:函数对象的过滤器
总时间限制: 1000ms 内存限制: 65536kB
描述
程序填空输出指定结果
#include <iostream>
#include <vector>
using namespace std;
struct A {
int v;
A() { }
A(int n):v(n) { };
bool operator<(const A & a) const {
return v < a.v;
}
};
template <class T>
struct FilterClass{
int m,n;
FilterClass(int mm, int nn){
m=mm;
n=nn;
}
bool operator()(T &x){
return T(m)<x&&x<T(n);
}
};
template <class T>
void Print(T s,T e)
{
for(;s!=e; ++s)
cout << *s << ",";
cout << endl;
}
template <class T1, class T2,class T3>
T2 Filter( T1 s,T1 e, T2 s2, T3 op)
{
for(;s != e; ++s) {
if( op(*s)) {
* s2 = * s;
++s2;
}
}
return s2;
}
ostream & operator <<(ostream & o,A & a)
{
o << a.v;
return o;
}
vector<int> ia;
vector<A> aa;
int main()
{
int m,n;
while(cin >> m >> n) {
ia.clear();
aa.clear();
int k,tmp;
cin >> k;
for(int i = 0;i < k; ++i) {
cin >> tmp;
ia.push_back(tmp);
aa.push_back(tmp);
}
vector<int> ib(k);
vector<A> ab(k);
vector<int>::iterator p = Filter(ia.begin(),ia.end(),ib.begin(),FilterClass<int>(m,n));
Print(ib.begin(),p);
vector<A>::iterator pp = Filter(aa.begin(),aa.end(),ab.begin(),FilterClass<A>(m,n));
Print(ab.begin(),pp);
}
return 0;
}
输入
多组数据
每组数据两行
第一行是两个整数 m 和 n
第二行先是一个整数k ,然后后面跟着k个整数
输出
对每组数据,按原顺序输出第二行的后k个整数中,大于m且小于n的数
输出两遍
数据保证一定能找到符合要求的整数
样例输入
1 3
1 2
2 8
5 1 2 3 4 9
样例输出
2,
2,
3,4,
3,4,
来源
Guo Wei
E:很难蒙混过关的CArray3d三维数组模板类
总时间限制: 1000ms 内存限制: 65536kB
描述
实现一个三维数组模版CArray3D,可以用来生成元素为任意类型变量的三维数组,输出指定结果
#include <iostream>
#include <iomanip>
#include <cstring>
using namespace std;
template <class T>
class CArray3D
{
public:
class CArray2D{
public:
T* arr;
int n,k;
CArray2D(){
n=k=0;
arr=nullptr;
}
CArray2D(int jj,int kk):n(jj),k(kk){
arr=new T[jj*kk];
}
T* operator[](int j){
return arr+j*k;
}
operator T*(){
return arr;
}
};
CArray2D *arr;
int m;
int n;
int k;
CArray3D(int ii,int jj, int kk):m(ii),n(jj),k(kk) {
arr = new CArray2D[ii];
for(int i=0;i<ii;i++){
arr[i].n=n;
arr[i].k=k;
arr[i].arr=new T[n*k];
}
}
CArray2D& operator[](int i){
return arr[i];
}
};
CArray3D<int> a(3,4,5);
CArray3D<double> b(3,2,2);
void PrintA()
{
for(int i = 0;i < 3; ++i) {
cout << "layer " << i << ":" << endl;
for(int j = 0; j < 4; ++j) {
for(int k = 0; k < 5; ++k)
cout << a[i][j][k] << "," ;
cout << endl;
}
}
}
void PrintB()
{
for(int i = 0;i < 3; ++i) {
cout << "layer " << i << ":" << endl;
for(int j = 0; j < 2; ++j) {
for(int k = 0; k < 2; ++k)
cout << b[i][j][k] << "," ;
cout << endl;
}
}
}
int main()
{
int No = 0;
for( int i = 0; i < 3; ++ i ) {
a[i];
for( int j = 0; j < 4; ++j ) {
a[j][i];
for( int k = 0; k < 5; ++k )
a[i][j][k] = No ++;
a[j][i][i];
}
}
PrintA();
memset(a[1],-1 ,20*sizeof(int));
memset(a[1],-1 ,20*sizeof(int));
PrintA();
memset(a[1][1],0 ,5*sizeof(int));
PrintA();
for( int i = 0; i < 3; ++ i )
for( int j = 0; j < 2; ++j )
for( int k = 0; k < 2; ++k )
b[i][j][k] = 10.0/(i+j+k+1);
PrintB();
int n = a[0][1][2];
double f = b[0][1][1];
cout << "****" << endl;
cout << n << "," << f << endl;
return 0;
}
输入
无
输出
等同于样例
样例输入
无
样例输出
layer 0:
0,1,2,3,4,
5,6,7,8,9,
10,11,12,13,14,
15,16,17,18,19,
layer 1:
20,21,22,23,24,
25,26,27,28,29,
30,31,32,33,34,
35,36,37,38,39,
layer 2:
40,41,42,43,44,
45,46,47,48,49,
50,51,52,53,54,
55,56,57,58,59,
layer 0:
0,1,2,3,4,
5,6,7,8,9,
10,11,12,13,14,
15,16,17,18,19,
layer 1:
-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,
layer 2:
40,41,42,43,44,
45,46,47,48,49,
50,51,52,53,54,
55,56,57,58,59,
layer 0:
0,1,2,3,4,
5,6,7,8,9,
10,11,12,13,14,
15,16,17,18,19,
layer 1:
-1,-1,-1,-1,-1,
0,0,0,0,0,
-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,
layer 2:
40,41,42,43,44,
45,46,47,48,49,
50,51,52,53,54,
55,56,57,58,59,
layer 0:
10,5,
5,3.33333,
layer 1:
5,3.33333,
3.33333,2.5,
layer 2:
3.33333,2.5,
2.5,2,
****
7,3.33333
提示
建议做法:
- ai[k] 这个表达式的第一个[]返回一个内部类的对象,该内部类也重载了[],且返回值为指针。
- 必要时需重载对象到指针的强制类型转换运算符
来源
Guo Wei
F:我自己的 ostream_iterator
总时间限制: 1000ms 内存限制: 65536kB
描述
程序填空输出指定结果
#include <iostream>
#include <list>
#include <string>
using namespace std;
template <class T1,class T2>
void Copy(T1 s,T1 e, T2 x)
{
for(; s != e; ++s,++x)
*x = *s;
}
template<class T>
class myostream_iteraotr
{
ostream & os_;
string s_;
T val;
public:
myostream_iteraotr(ostream & os, const string &s) :os_(os), s_(s) {}
T& operator *(){
return val;
}
ostream&operator++(){
os_<<val<<s_;
return os_;
}
};
int main()
{ const int SIZE = 5;
int a[SIZE] = {5,21,14,2,3};
double b[SIZE] = { 1.4, 5.56,3.2,98.3,3.3};
list<int> lst(a,a+SIZE);
myostream_iteraotr<int> output(cout,",");
Copy( lst.begin(),lst.end(),output);
cout << endl;
myostream_iteraotr<double> output2(cout,"--");
Copy(b,b+SIZE,output2);
return 0;
}
输入
无
输出
5,21,14,2,3,
1.4--5.56--3.2--98.3--3.3--
样例输入
无
样例输出
同输入
来源
Guo Wei