UVA 10815 Andy's First Dictionary(STL)

#include<iostream>
#include<cstdio>
#include<set>
#include<string>
#include<string.h>
#include<cstring>
#include<vector>
#include<map>
#include<queue>
#include<stack>
#include<cctype>
#include<algorithm>
#include<sstream>
#include<utility>
#define mt(a) memset(a,0,sizeof (a))
#define fl(a,b,c) fill(a,b,c)
#define SWAP(a,b,t) (t=a,a=b,b=t)

#define inf 1000000000+7

using namespace std;

map<string,int>m;

int main()
{
string t;
while (cin >> t)
{
for (int i = 0; i < t.size(); i++)
{
if (isalpha(t[i]))t[i] = tolower(t[i]);
else t[i] = ' ';

}
stringstream ss(t);
string n;
while (ss>>n)
m
++;
}
map<string, int>::iterator po;
for (po = m.begin(); po != m.end(); po++)
{
cout << (po->first) << endl;
}
return 0;
}