Using std::map instead of list will be easier.
int main()
{
map<string,int> stringMap;
for (int i=0;i<3;i++)
{
cout<<"Enter string: ";
string s;
cin>>s;
if(stringMap.find(s)!=stringMap.end())
{
stringMap[s]++;
}
else
{
stringMap[s]=1;
}
}
for (map<string,int>::const_iterator itr = stringMap.cbegin(); itr!=stringMap.cend(); ++itr)
{
if(itr->second > 1)
cout<<itr->first << " occurs "<<itr->second<<" times"<<endl;
else
cout<<itr->first << " occurs "<<itr->second<<" time"<<endl;
}
return 0;
}