特定のケースに対してN文字のシーケンスを生成するC++プログラム

これは、特定のケースに対してN文字のシーケンスを生成するC++プログラムです。

アルゴリズム

Begin
   function GenerateSequence() generate a Sequence of N Characters for a Given Specific Case:
      Use rand() for generating random indexes.
      Store the first character directly into the sequence.
      If that sequence is used earlier, then it discards that and generates random index again.
End

例

#include<iostream>
#include<stdlib.h>
#include<string.h>
using namespace std;
void GenerateSequence(char string[], int n, int l, char *sequence)
{
   int i, j=0, k,in;
   for(i = 0; i < n; i++) {
      //store first character directly into sequence
      if(j == 0)
         sequence[j++] = string[rand()%l];
      else {
         h:
         in = rand()%l;
         for(k = 0; k < j; k++) {
            if(string[in] == sequence[k])
               goto h;
         }
         sequence[j++] = string[in];
      }
   }
   sequence[j] = '\0'; //end the sequence with null character
}
int main() {
   int n, m, l, i;
   char string[100];
   cout<<"Enter the original string: ";
   cin>>string;
   cout<<"\nEnter the number of strings to be generated from the Base string: ";
   cin>>n;
   cout<<"\nEnter the length of each string to be generated: ";
   cin>>m;
   l = strlen(string);
   for(i = 0; i < n; i++) {
      char sequence[m];
      GenerateSequence(string, m, l, sequence);
      cout<<"\nSequence "<<i+1<<": "<<sequence;
   }
   return 0;
}

出力

Enter the original string: tutorialspoint
Enter the number of strings to be generated from the Base string: 7
Enter the length of each string to be generated: 6
Sequence 1: tuanol
Sequence 2: itlurp
Sequence 3: tonaiu
Sequence 4: untlri
Sequence 5: liorpt
Sequence 6: liusto
Sequence 7: luisot