POJ 1016

  1 #include <iostream>
  2 #include <string>
  3 using namespace std;
  4 
  5 string str[16];
  6 
  7 void process(string input, int index)
  8 {
  9     if(index == 16)
 10     {
 11         return;
 12     }
 13 
 14     int number[10] = {0};
 15     for(int i=0; i<input.length(); i++)
 16     {
 17         number[input[i]-'0']++;
 18     }
 19     string temp;
 20     for(int i=0; i<10; i++)
 21     {
 22         if(number[i] > 0)
 23         {
 24             if(number[i]<10)
 25             {
 26                 temp.insert(temp.end(), number[i]+'0');
 27             }
 28             else
 29             {
 30                 temp.insert(temp.end(), number[i]/10 + '0');
 31                 temp.insert(temp.end(), number[i]%10 + '0');
 32             }
 33 
 34             temp.insert(temp.end(), i+'0');
 35         }
 36     }
 37     str[index] = temp;
 38     process(temp, index+1);
 39 }
 40 
 41 int find_loop(int index)
 42 {
 43     for(int i=index+1; i<=15; i++)
 44     {
 45         if(str[index] == str[i])
 46         {
 47             return i-index;
 48         }
 49     }
 50 
 51     return 0;
 52 }
 53 
 54 int main()
 55 {
 56     string input;
 57     
 58     while(cin >> input)
 59     {
 60         if(input == "-1")
 61         {
 62             break;
 63         }
 64 
 65         str[0] = input;
 66         process(input, 1);
 67 
 68         bool after = false;
 69         if(str[0] == str[1])
 70         {
 71             cout << input << " is self-inventorying" << endl;
 72         }
 73         else
 74         {
 75             for(int i=1; i<=15; i++)
 76             {
 77                 if(str[i] == str[i-1])
 78                 {
 79                     after = true;
 80                     cout << input << " is self-inventorying after " << i-1 << " steps" << endl; 
 81                     break;
 82                 }
 83             }
 84 
 85             int loop = 0;
 86             if(!after)
 87             {
 88                 for(int i=0; i<=15; i++)
 89                 {
 90                     loop = find_loop(i);
 91                     if(loop > 0)
 92                     {
 93                         cout << input << " enters an inventory loop of length "<< loop << endl; 
 94                         break;
 95                     }
 96                 } 
 97             }
 98 
 99             if(!after && loop ==0)
100             {
101                 cout << input << " can not be classified after 15 iterations" << endl;  
102             }
103         }
104     }
105 
106     return 0;
107 }