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  1. #include <stdio.h>
  2. #include <vector>
  3.  
  4. const char digitset[] = "123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  5.  
  6. void allocate_to_groups_impl( std::vector<char>& usage, std::vector<int>& order, const std::vector<int>& cumsum, int group, int place, int min )
  7. {
  8.     if (place == cumsum[group]) {
  9.         group++; min = 0;
  10.         if (group == cumsum.size()) {
  11.             for( std::vector<int>::iterator it = order.begin(); it != order.end(); ++it )
  12.                 putchar(digitset[*it]);
  13.             putchar('\n');
  14.             return;
  15.         }
  16.     }
  17.  
  18.     for( int v = min, max = usage.size() + place - cumsum[group]; v <= max; ++v ) {
  19.         if (!usage[v]) {
  20.             order[place] = v;
  21.             usage[v] = 1;
  22.             allocate_to_groups_impl(usage, order, cumsum, group, place+1, v+1);
  23.             usage[v] = 0;
  24.         }
  25.     }
  26. }
  27.  
  28. template<size_t Ngroups>
  29. void allocate_to_groups( int (&c)[Ngroups] )
  30. {
  31.     size_t sum_of_c = 0;
  32.     std::vector<int> cumsum_of_c;
  33.     for( int it = c; it < c + Ngroups; ++it )
  34.         cumsum_of_c.push_back(sum_of_c += *it);
  35.     std::vector<int> order(sum_of_c);
  36.     std::vector<char> usage(sum_of_c);
  37.  
  38.     allocate_to_groups_impl(usage, order, cumsum_of_c, 0, 0, 0);
  39. }
  40.  
  41. int main(void)
  42. {
  43.     int c[] = { 2, 3, 2 };
  44.     allocate_to_groups(c);
  45. };
Compilation error #stdin compilation error #stdout 0s 2960KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function 'void allocate_to_groups(int (&)[Ngroups])':
prog.cpp:34:44: error: invalid type argument of unary '*'
prog.cpp: In function 'void allocate_to_groups(int (&)[Ngroups]) [with unsigned int Ngroups = 3u]':
prog.cpp:44:25:   instantiated from here
prog.cpp:33:19: error: invalid conversion from 'int*' to 'int'
prog.cpp:33:19: error: ISO C++ forbids comparison between pointer and integer
stdout
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Standard output is empty
https://ideone.com/HUy02
language:
C++14 (gcc 8.3)
created:
14 years ago
visibility:
public

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