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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. //check là con sau phải lớn hơn (0) hay nhỏ hơn (1)
  4. const int MaxN = 35;
  5. int n;
  6. int a[MaxN];
  7. void backtrack(int pos, int sum,int val, int check)
  8. {
  9.     if(sum==n)
  10.     {
  11.         for (int i=1; i<=pos-1; i++)
  12.         {
  13.             cout << a[i] << " ";
  14.         }
  15.         cout << "\n";
  16.         return ;
  17.     }
  18.     if(pos==1)
  19.     {
  20.         for (int i=1; i<=n; i++)
  21.         {
  22.             a[pos]=i;
  23.             if(i==1)
  24.             {
  25.                 backtrack(pos+1,sum+i,i,0);
  26.             }
  27.             else if(i==n)
  28.             {
  29.                 backtrack(pos+1,sum+i,i,1);
  30.             }
  31.             else
  32.             {
  33.                 backtrack(pos+1,sum+i,i,1);
  34.                 backtrack(pos+1,sum+i,i,0);
  35.             }
  36.         }
  37.     }
  38.     else
  39.     {
  40.         if(check==0)
  41.         {
  42.             for (long long i=val+1; i<=n-sum; i++)
  43.             {
  44.                 a[pos]=i;
  45.                 backtrack(pos+1,sum+i,i,1);
  46.             }
  47.         }
  48.         else
  49.         {
  50.             for (long long i=1; i<val; i++)
  51.             {
  52.                 a[pos]=i;
  53.                 backtrack(pos+1,sum+i,i,0);
  54.             }
  55.         }
  56.     }
  57. }
  58. int main()
  59. {
  60.     ios_base::sync_with_stdio(0);
  61.     cin.tie(0);
  62.     cin >> n;
  63.     backtrack(1,0,0,0);
  64. }
  65.  
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
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language:

						
C++14 (gcc 8.3)

					

					

						
created:
								
						
4 days ago

					

					

						
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