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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ms(s,n) memset(s,n,sizeof(s))
  5. #define all(a) a.begin(),a.end()
  6. #define present(t, x) (t.find(x) != t.end())
  7. #define sz(a) int((a).size())
  8. #define FOR(i, a, b) for (int i = (a); i < (b); ++i)
  9. #define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i)
  10. #define pb push_back
  11. #define pf push_front
  12. #define fi first
  13. #define se second
  14. #define mp make_pair
  15.  
  16. typedef long long ll;
  17. typedef unsigned long long ull;
  18. typedef long double ld;
  19. typedef pair<int,int> pi;
  20. typedef vector<int> vi;
  21. typedef vector<pi> vii;
  22.  
  23. const int MOD = (int) 1e9+7;
  24. const int INF = (int) 1e9+1;
  25. inline ll gcd(ll a,ll b){ll r;while(b){r=a%b;a=b;b=r;}return a;}
  26. inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
  27.  
  28.  
  29. void FileIO(){
  30. 	freopen("input.txt","r", stdin);
  31. 	freopen("output.txt","w",stdout);
  32. }
  33.  
  34. int n,k,s,ans=0;
  35. int x[100];
  36. int a[21];
  37.  
  38. void inp(){
  39. 	cin>>n>>k>>s;
  40. 	FOR(i,1,n+1) a[i]=i;
  41. }
  42.  
  43. void ql(int pos,int cnt,int sum){
  44. 	if(cnt==k && sum==s){
  45. 		// for(int i=0;i<cnt;i++){
  46. 		// 	cout<<x[i]<<" ";
  47. 		// }
  48. 		// cout<<"\n";
  49. 		++ans;
  50. 		return;
  51. 	}
  52. 	for(int j=pos;j<=n;j++){
  53. 		if(a[j]+sum<=s){
  54. 			x[cnt]=a[j];
  55. 			ql(j+1,cnt+1,sum+a[j]);
  56. 		}
  57. 	}
  58. }
  59.  
  60. int main(){
  61. 	//FileIO();
  62. 	while(true){
  63. 		inp();
  64. 		if(n==0 && k==0 && s==0){
  65. 			break;
  66. 		}
  67. 		ans=0;
  68. 		ql(1,0,0);
  69. 		cout<<ans<<"\n";
  70. 	}
  71. }
Success #stdin #stdout 0s 5284KB
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https://ideone.com/4ki3m1
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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