#include "stdafx.h" #include <iostream> #include <string> using namespace std;

int main() {  int n=0;  cin >> n;  string hex[10];  for(int i=0;i<n;i++)  {   cin >> hex[i];  }  for (int i = 0; i < n; i++)  {   string eight;   char eig;   string tow;   for (int j = 0; j < hex[i].length(); j++)   {    if (hex[i][j] <= '9')    {     int now = hex[i][j]-'0';     eig = now / 8 + '0';     tow = tow + eig;     eig = now % 8 / 4 + '0';     tow = tow + eig;     eig = now % 4 / 2 + '0';     tow = tow + eig;     eig = now % 2 + '0';     tow = tow + eig;    }    else    {     int now = hex[i][j]-'A'+10;     eig = now / 8 + '0';     tow = tow + eig;     eig = now % 8 / 4 + '0';     tow = tow + eig;     eig = now % 4 / 2+'0';     tow = tow + eig;     eig = now % 2+'0';     tow = tow + eig;

   }   }   int m = tow.length() % 3;   if (m == 1)   {    tow.insert(0,"00");   }   if (m == 2)   {    tow.insert(0, "0");   }   for (int k = 0; k < tow.length() / 3; k++)   {    eig = (tow[k*3] - '0') * 4 + (tow[k*3 + 1] - '0') * 2 + (tow[k*3 + 2]);    eight = eight + eig;   }   if (eight[0] = '0')   {    for (int i = 1; i < eight.length(); i++)    {     cout << eight[i];    }

  }   cout << endl;        }

 system("pause");     return 0; }

---------------列舉法----------

#include "stdafx.h" #include <iostream> #include <string> using namespace std;

int main() {  int n=0;  cin >> n;  string hex[10];  for(int i=0;i<n;i++)  {   cin >> hex[i];  }  for (int i = 0; i < n; i++)  {   string eight;   char eig;   string tow;   for (int j = 0; j < hex[i].length(); j++)   {    switch (hex[i][j])    {    case '0':tow += "0000"; break;    case '1':tow += "0001"; break;    case '2':tow += "0010"; break;    case '3':tow += "0011"; break;    case '4':tow += "0100"; break;    case '5':tow += "0101"; break;    case '6':tow += "0110"; break;    case '7':tow += "0111"; break;    case '8':tow += "1000"; break;    case '9':tow += "1001"; break;    case 'A':tow += "1010"; break;    case 'B':tow += "1011"; break;    case 'C':tow += "1100"; break;    case 'D':tow += "1101"; break;    case 'E':tow += "1110"; break;    case 'F':tow += "1111"; break;    default:     break;    }   }   int m = tow.length() % 3;   if (m == 1)   {    tow.insert(0,"00");   }   if (m == 2)   {    tow.insert(0, "0");   }   if (!(tow[0] == '0'&&tow[1] == '0'&&tow[2] == '0'))   {    eig = (tow[0] - '0') * 4 + (tow[1] - '0') * 2 + (tow[2]);    eight = eight + eig;   }   for (int k = 3; k < tow.length() / 3; k=k+3)   {    if (tow.substr(k, 3) == "000")     eight += "0";    else if (tow.substr(k, 3) == "001")     eight += "1";    else if (tow.substr(k, 3) == "010")     eight += "2";    else if (tow.substr(k, 3) == "011")     eight += "3";    else if (tow.substr(k, 3) == "100")     eight += "4";    else if (tow.substr(k, 3) == "101")     eight += "5";    else if (tow.substr(k, 3) == "110")     eight += "6";    else if (tow.substr(k, 3) == "111")     eight += "7";   }   cout << eight<<endl;

       }

 system("pause");     return 0; }