CTU Open Contest 2016 Hot Air Ballooning

map<string,bool>mp;string s;int n;int ans;void solve(){    map<char,bool>m;    int len=s.length();    for(int i=0;i<len;i++)    {        m[s[i]]=1;    }    s="";    for(char a='0';a<='9';a++)    {        if(m[a])s+=a;    }    if(mp[s]) return;    ans++;    mp[s]=1;}int main(){    while(cin>>n)    {        ans=0;        mp.clear();        for(int i=1;i<=n;i++)        {            cin>>s;            solve();        }        cout<<ans<<endl;    }    return 0;}