Equivalent Strings(Codeforces Round #313 (Div. 2) D)

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#include <iostream>#include <string>#include <vector>using namespace std;string a,b;bool funt(int fa,int la,int fb,int lb){    int i,j;    for(i=fa,j=fb;i<la;i++,j++)        if(a[i]!=b[j])           break;    if(i==la)        return true;    if((la-fa)%2)        return false;    int k=(la-fa)/2; if (funt(fa,fa+k,fb+k,lb)&&funt(fa+k,la,fb,fb+k))      return true;  if(funt(fa,fa+k,fb,fb+k)&&funt(fa+k,la,fb+k,lb))      return true;    return false;}int main(){    cin>>a;    cin>>b;    if(funt(0,a.size(),0,b.size()))       cout<<"YES"<<endl;    else       cout<<"NO"<<endl;    return 0;}

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