POJ 2418

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

struct node
{
    string s;
    node * l;
    node * r;
    double sum;
    node()
    {
        l = NULL;
        r = NULL;
        sum = 0;
    }
};

double all;

node * insert(string s,node * root)
{
    if(root == NULL)
    {
        root = new node();
        root->s = s;
        root->sum ++;
        return root;
    }
    if(s == root->s)
    {
        root->sum ++;
    }
    else if(s < root->s)
    {
        root->l = insert(s,root->l);
    }
    else if(s > root->s)
    {
        root->r = insert(s,root->r);
    }
    return root;
}

void tra_2(node * root)
{
    if(root->l != NULL)
    {
        tra_2(root->l);
    }
//    if(root->s != "")
    cout<<root->s<<" "<<setiosflags(ios::fixed)<<setprecision(4)<<(root->sum*100/all)<<endl;
//    cout<<root->s<<root->sum<<endl;
    if(root->r != NULL)
    {
        tra_2(root->r);
    }
}

int main()
{
    //freopen("acm.acm","r",stdin);
    string s;
    all = 0;
    node * root = NULL;
    while(getline(cin,s),s != "")
    {
        //getchar();
        ++ all;
        root = insert(s,root);
    }
//    -- all;
//    cout<<all<<endl;
    tra_2(root);
}