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  1. #include<bits/stdc++.h>
  2. #define pii pair<int,int>
  3. #define ll long long
  4. #define endl '\n'
  5. #define fastIO ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
  6.  
  7. using namespace std;
  8.  
  9. int n;
  10. string a,b;
  11. string c,d;
  12. vector<int>ans;
  13. bool g=false;
  14.  
  15. void change(int ind,int del)
  16. {
  17.     char c;
  18.  
  19.     if(del>0)
  20.     {
  21.         for(int i=ind; i<n; i++)
  22.         {
  23.             c='0';
  24.  
  25.             int tm=i+del;
  26.  
  27.             if(tm>=0 && tm<n)c=a[tm];
  28.  
  29.             if(a[i]!=c)a[i]='1';
  30.             else a[i]='0';
  31.         }
  32.     }
  33.  
  34.     else
  35.     {
  36.         for(int i=n-1; i>=ind; i--)
  37.         {
  38.             c='0';
  39.  
  40.             int tm=i+del;
  41.  
  42.             if(tm>=0 && tm<n)c=a[tm];
  43.  
  44.             if(a[i]!=c)a[i]='1';
  45.             else a[i]='0';
  46.         }
  47.     }
  48. }
  49.  
  50.  
  51. bool solve()
  52. {
  53.      bool f=true;
  54.      int ind;
  55.  
  56.         int i;
  57.         for(i=0; i<n; i++)
  58.         {
  59.             if(b[i]=='1')
  60.             {
  61.                 if(a[i]=='1')
  62.                 {
  63.                     ind=i;
  64.                     break;
  65.                 }
  66.  
  67.                 else
  68.                 {
  69.                     int tm=n;
  70.  
  71.                     for(int j=i+1; j<n; j++)
  72.                         if(a[j]=='1')
  73.                         {
  74.                             tm=j;
  75.                             break;
  76.                         }
  77.  
  78.                     if(tm>=n)
  79.                     {
  80.                         f=false;
  81.                         break;
  82.                     }
  83.  
  84.                     tm=tm-i;
  85.                     change(i,tm);
  86.  
  87.                     ans.push_back(tm);
  88.  
  89.                     ind=i;
  90.                     break;
  91.                 }
  92.             }
  93.  
  94.             else
  95.             {
  96.                 if(a[i]!=b[i])
  97.                 {
  98.                     int tm=n;
  99.  
  100.                     for(int j=i+1; j<n; j++)
  101.                         if(a[j]=='1')
  102.                         {
  103.                             tm=j;
  104.                             break;
  105.                         }
  106.  
  107.                     if(tm>=n)
  108.                     {
  109.                         f=false;
  110.                         break;
  111.                     }
  112.  
  113.                     tm=tm-i;
  114.                     change(i,tm);
  115.  
  116.                     ans.push_back(tm);
  117.                 }
  118.             }
  119.         }
  120.  
  121.         if(f)
  122.         {
  123.             for(; i<n; i++)
  124.             {
  125.                 if(a[i]!=b[i])
  126.                 {
  127.                     int tm=i-ind;
  128.                     change(i,-tm);
  129.  
  130.                     ans.push_back(-tm);
  131.  
  132.                 }
  133.             }
  134.         }
  135.  
  136.         return a==b;
  137. }
  138.  
  139. int main()
  140. {
  141.     fastIO;
  142.  
  143.     int t;
  144.     cin>>t;
  145.  
  146.     while(t--)
  147.     {
  148.         ans.clear();
  149.  
  150.         cin>>n>>a>>b;
  151.  
  152.         c=a;
  153.         d=b;
  154.  
  155.         g=false;
  156.  
  157.         bool check=solve();
  158.  
  159.         if(check==false)
  160.         {
  161.              g=true;
  162.              a=c;
  163.              b=d;
  164.  
  165.              ans.clear();
  166.  
  167.              reverse(a.begin(),a.end());
  168.              reverse(b.begin(),b.end());
  169.  
  170.              check=solve();
  171.         }
  172.  
  173.         if(check)
  174.         {
  175.             int sz=ans.size();
  176.  
  177.             cout<<sz<<endl;
  178.             for(int j=0; j<sz; j++)
  179.             {
  180.                 if(g)ans[j]*=-1;
  181.                 cout<<ans[j]<<' ';
  182.             }
  183.             if(sz>0)cout<<endl;
  184.         }
  185.  
  186.         else cout<<-1<<endl;
  187.     }
  188.     return 0;
  189. }
  190.  
  191.  
  192.  
Success #stdin #stdout 0.01s 5372KB
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https://ideone.com/Vx7Vpg
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
secret

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