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  1. #pragma GCC optimize ("Ofast")
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. #define main dummy_main
  5. int main(){
  6.   return 0;
  7. }
  8. #undef main
  9. int sz;
  10. int cur;
  11. int n;
  12. string alpha;
  13. int len;
  14. string now;
  15. string res[10100];
  16. void doit(int dep, int st){
  17.   int i;
  18.   if(sz >= 10010){
  19.     return;
  20.   }
  21.   if(dep==len){
  22.     res[sz++] = now;
  23.     return;
  24.   }
  25.   for(i=(st);i<(n);i++){
  26.     now[dep] = alpha[i];
  27.     doit(dep+1, i+1);
  28.   }
  29. }
  30. class CombinationIterator{
  31.   public:
  32.   CombinationIterator(string characters, int combinationLength){
  33.     int i;
  34.     sz = cur = 0;
  35.     alpha = characters;
  36.     len = combinationLength;
  37.     n = alpha.size();
  38.     now = "";
  39.     for(i=(0);i<(len);i++){
  40.       now += 'a';
  41.     }
  42.     doit(0, 0);
  43.   }
  44.   string next(){
  45.     return res[cur++];
  46.   }
  47.   bool hasNext(){
  48.     return cur < sz;
  49.   }
  50. }
  51. ;
  52. // cLay varsion 20191214-1
  53.  
  54. // --- original code ---
  55. // #define main dummy_main
  56. // {}
  57. // #undef main
  58. // 
  59. // int sz, cur, n;
  60. // string alpha; int len;
  61. // string now;
  62. // string res[10100];
  63. // 
  64. // void doit(int dep, int st){
  65. //   if(sz >= 10010) return;
  66. //   if(dep==len) res[sz++] = now, return;
  67. //   rep(i,st,n){
  68. //     now[dep] = alpha[i];
  69. //     doit(dep+1, i+1);
  70. //   }
  71. // }
  72. // 
  73. // class CombinationIterator {
  74. // public:
  75. //   CombinationIterator(string characters, int combinationLength) {
  76. //     sz = cur = 0;
  77. //     alpha = characters;
  78. //     len = combinationLength;
  79. //     n = alpha.size();
  80. //     now = "";
  81. //     rep(i,len) now += 'a';
  82. //     doit(0, 0);
  83. //   }
  84. //   string next() {
  85. //     return res[cur++];
  86. //   }
  87. //   bool hasNext() {
  88. //     return cur < sz;
  89. //   }
  90. // };
  91.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/MWgCia
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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