fork download 
  1. #include<bits/stdc++.h>
  2. using namespace std ;
  3. #define endl "\n"
  4.  
  5. int n , k , a[100];
  6. bool check = false; 
  7. void khoiTao(){
  8.     for(int i = 1 ; i <= k ; i++) 
  9.         a[i] = i ;
  10. }
  11.  
  12. void Sinh(){
  13.     int i = k ;
  14.     while(i >= 1 && a[i] == n - k + i){
  15.         --i; 
  16.     }
  17.     if(i == 0){
  18.         check = true ; // danh dau day la bit cuoi cung
  19.     }
  20.     else{
  21.         a[i] += 1 ; // tang a[i] len 1 don vi
  22.         for(int  j = i + 1 ; j <= k ; j++){
  23.             a[j] = a[j - 1] + 1 ;
  24.         }
  25.     }
  26. }
  27.  
  28. int main(){
  29.     ios::sync_with_stdio(false);
  30.     cin.tie(nullptr);
  31.     cout.tie(nullptr);
  32.  
  33.     cin >> n >> k ;
  34.     khoiTao();
  35.     while(!check){
  36.         for(int i = 1 ; i <= k ; i++){
  37.             cout << a[i] ;
  38.         }
  39.         cout << endl;
  40.         Sinh();
  41.     }
  42.  
  43. }
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin 
5 3
stdout 
123
124
125
134
135
145
234
235
245
345
https://ideone.com/fX8dHj
language:
C++ (gcc 8.3)
created:
20 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!