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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int vis[1000005];
  4. int n;
  5. void dfs(int i)
  6. {
  7.   if(i>n)
  8.     return;
  9.   vis[i]=1;
  10.   if(!vis[i+4])
  11.   dfs(i+4);
  12.   if(!vis[i+7])
  13.   dfs(i+7);
  14. } 
  15. int main()
  16. {
  17.   scanf("%d",&n);
  18.   memset(vis,0,sizeof(vis));
  19.   dfs(0);
  20.   set<int> s;
  21.   //cout<<vis[n]<<"ab\n";
  22.   //cout<<"abc";
  23.   for(int i=1;i<=n;i++)
  24.   {
  25.     //cout<<2;
  26.     if(vis[i]==1)
  27.     {
  28.       s.insert(i);
  29.       //cout<<i<<' ';
  30.     }
  31.   }
  32.   if(s.find(n)==s.end())
  33.   {
  34.     cout<<-1;
  35.     return 0;
  36.   }
  37.   vector<int> v;
  38.   while(n>0)
  39.   {
  40.    // cout<<n;
  41.     if(s.find(n-7)!=s.end())
  42.     {
  43.       v.push_back(7);
  44.       n-=7;
  45.       continue;
  46.     }
  47.     if(s.find(n-4)!=s.end())
  48.     {
  49.       v.push_back(4);
  50.       n-=4;
  51.     }
  52.   }
  53.   sort(v.begin(),v.end());
  54.   for(int i=0;i<v.size();i++)
  55.     printf("%d",v[i]);
  56.   return 0;
  57. }
Time limit exceeded #stdin #stdout 5s 7136KB
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https://ideone.com/AJQ4sv
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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