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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define pb push_back
  4. #define REP(i, a, b) for (int i = a; i <= b; i++)
  5. #define BACK(i, a, b) for (int i = a; i >= b; i--) 
  6. #define MOD 1000000007
  7. #define PI 4 * atan(1)
  8. #define sz(A) (int)A.size()
  9. typedef long long ll;
  10. typedef vector<int> vi;
  11. typedef pair<int, int> pii;
  12. typedef vector<long long> vll;
  13. typedef long int int32;
  14. typedef unsigned long int uint32;
  15. typedef long long int int64;
  16. typedef unsigned long long int uint64;
  17. int n,k;
  18. set<string> s;
  19. vector<string> use;
  20. vector<string> res;
  21. void result(){
  22.     for(int i=1; i<res.size(); i++){
  23.         cout << res[i] << " ";
  24.     }
  25.     cout << "\n";
  26. }
  27. void backtrack(int i){
  28.     for(string x: use){
  29.         if(x > res[i-1]){
  30.             res.push_back(x);
  31.             if(i == k){
  32.                 result();
  33.             }else{
  34.                 backtrack(i+1);
  35.             }
  36.             res.pop_back();
  37.         }
  38.     }
  39. }
  40. void solve(int test){
  41.     cin >> n >> k;
  42.     string temp;
  43.     for(int i=0; i <n; i++){
  44.         cin >> temp;
  45.         s.insert(temp);
  46.     }
  47.     for(string x: s){
  48.         use.pb(x);
  49.     }
  50.     res.push_back("@");
  51.     backtrack(1);
  52. }   
  53. int main(){
  54.     ios_base::sync_with_stdio(false);
  55.     cin.tie(NULL);
  56.     cout.tie(NULL);
  57.     int typetest = 0;
  58.     if (typetest){
  59.         int t;
  60.         cin >> t;
  61.         cin.ignore();
  62.         REP(i, 1, t){
  63.             solve(i);
  64.         }
  65.     }
  66.     else solve(0);
  67. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/RqhU1M
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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