1:成績排序

#include <iostream>
#include <cstring>
using namespace std;
#define MAX_NUM 20
#define MAX_NAME 20
struct Student {
  char name[MAX_NAME+1];
  int score;
};
int main(void)
{
  Student student[MAX_NUM] = {{'\0',-1}};
  int n = 0;
  cin >> n;
  for(int c=0; c<n; c++)
  {
    Student s = {{'\0'
 
,-1}};
    cin >> s.name >> s.score;
    int p = c;
    for(int i=0; i<c; i++)
    {
      if(student[i].score < s.score 
        || (student[i].score == s.score && strcmp(student[i].name, s.name)>0))
      {
        p = i;
        for(int j=c; j>i; j--)
          student[j] = student[j-1
 
];
        break;
      }
    }
    student[p] = s;
  }
  for(int c=0; c<n; c++)
    cout << student[c].name << " " << student[c].score << endl;
  return 0;
}

2:分數線劃定

#include <iostream>
using namespace std;
struct Competitor {
  int k;
  int s;
};
#define MAX_NUM 5000
 

int main(void)
{
  int n = 0;
  int m = 0;
  Competitor competitor[MAX_NUM] = {{0,0}};
  cin >> n >> m;
  for(int c=0; c<n; c++)
  {
    Competitor comp = {0,0};
    cin >> comp.k >> comp.s;
    int p = c;
    for(int i=0; i<c; i++)
    {
      if(competitor[i].s < comp.s
        || (competitor[i].s == comp.s && competitor[i].k > comp.k))
      {
        p = i;
        for(int j=c; j>i; j--)
          competitor[j] = competitor[j-1];
        break;
      }
    }
    competitor[p] = comp;
  }
  int score = competitor[m*150/100 - 1].s;
  int cnt = 0;
  for(cnt=0;cnt<n && competitor[cnt].s>=score;cnt++);
  cout << score << " " << cnt << endl;
  for(int i=0;i<cnt;i++)
    cout << competitor[i].k << " " << competitor[i].s << endl;
  return 0;
}

3:病人排隊

#include <iostream>
using namespace std;
#define MAX_NAME 10
#define MAX_NUM 100
struct Sick {
  char id[MAX_NAME];
  int age;
};
int main(void)
{
  int n = 0;
  int m = 0;
  Sick sick_old[MAX_NUM] = {{'\0',0}};
  Sick sick_young[MAX_NUM] = {{'\0',0}};
  int yi = 0;
  int oi = 0;
  cin >> n;
  for(int c=0; c<n; c++)
  {
    Sick sk = {'\0',0};
    cin >> sk.id >> sk.age;
    if (sk.age < 60)
    {
      sick_young[yi++] = sk;
    }
    else
    {
      oi++;
      int p = c;
      for(int i=0; i<c; i++)
      {
        if(sick_old[i].age < sk.age)
        {
          p = i;
          for(int j=c; j>i; j--)
            sick_old[j] = sick_old[j-1];
          break;
        }
      }
      sick_old[p] = sk;
    }
  }
  for(int i=0;i<oi;i++)
    cout << sick_old[i].id << endl;
  for(int i=0;i<yi;i++)
    cout << sick_young[i].id << endl;
  return 0;
}

4:mysort

#include <iostream>
using namespace std;
struct A {
    int nouse1;
    int nouse2;
    int n;
};
// 在此處補充你的程式碼
void mysort(void *list_in, int len, int size, int (*func)(const void *,const void *))
{
  char *list = (char *)list_in;
  for (int i = len-1; i > 0; --i)
  {
    for(int j = 0; j < i; ++j)
    {
      if(func(list+j*size, list+(j+1)*size)>0)
      {
        for(int c=0; c<size; c++)
        {
          char temp = *(list+j*size+c);
          *(list+j*size+c) = *(list+(j+1)*size+c);
          *(list+(j+1)*size+c) = temp;
        }
      }
    }
  }
}
int MyCompare1( const void * e1,const void * e2) 
{
    int * p1 = (int * ) e1;
    int * p2 = (int * ) e2;
    return * p1 - * p2;
}
int MyCompare2( const void * e1,const void * e2) 
{
    int * p1 = (int * ) e1;
    int * p2 = (int * ) e2;
    if( (* p1 %10) - (* p2 % 10))
        return (* p1 %10) - (* p2 % 10);
    else
        return * p1 - * p2;
}
int MyCompare3( const void * e1,const void * e2) 
{
    A * p1 = (A*) e1;
    A * p2 = (A*) e2;
    return p1->n - p2->n;
}
int a[20];
A b[20];
int main ()
{   
    int n;
    while(cin >> n) {
        for(int i = 0;i < n; ++i) {
            cin >> a[i];
            b[i].n = a[i];
        }
        mysort(a,n,sizeof(int),MyCompare1);
        for(int i = 0;i < n; ++i) 
            cout << a[i] << "," ;
        cout << endl;
        mysort(a,n,sizeof(int),MyCompare2);
        for(int i = 0;i < n; ++i) 
            cout << a[i] << "," ;
        cout << endl;
        mysort(b,n,sizeof(A),MyCompare3);
        for(int i = 0;i < n; ++i) 
            cout << b[i].n << "," ;
        cout << endl;
    }
    return 0;
}

5:從字串中取數

#include <iostream>
#include <iomanip>
using namespace std;
double GetDoubleFromString(char * str)
{
// 在此處補充你的程式碼
  static char *s = NULL;
  if(str != NULL)
  {
    s = str;
  }
  int f = 1;
  double t = 0;
  double n = 0;
  for(;*s!='\0';s++)
  {
    if(*s!='.'&&(*s<'0'||'9'<*s) )
    {
      if(f==0)
        break;
    }
    else if (*s=='.'&&*(s+1)=='.')
    {
      s++;
      if(f==0)
        break;
    }
    else if(*s=='.')
    {
      t=1;
    }
    else
    {
      f = 0;
      if(t==0)
      {
        n = n*10 + (*s-'0');
      }
      else
      {
        t *= 10;
        n += (*s-'0')/t;
      }
    }
  }
  if(f==1)
  {
    return -1;
  }
  else
  {
    return n;
  }
}

int main()
{
    char line[300];
    while(cin.getline(line,280)) {
        double n;
        n = GetDoubleFromString(line);
        while( n > 0) {
            cout << fixed << setprecision(6) << n << endl;
            n = GetDoubleFromString(NULL);
        }
    }
    return 0;
}

-eof-