统计输入单词的个数

struct Pair{ string name; double val;};

vector<Pair>pairs;

double& value(const string&s){ for(int i = 0; i < pairs.size(); ++i)  if( s == pairs[i].name) return pairs[i].val;

 Pair p = {s,0}; pairs.push_back(p);

 return pairs[pairs.size() - 1].val;}

int main(){ string buf;  while(cin>>buf && buf != "exit") value(buf)++;

 for( vector<Pair>::const_iterator p = pairs.begin(); p!= pairs.end(); ++p)  cout<<p->name<<":"<<p->val<<"/n";  system("pause");

 return 0;}