POJ2418: Dictionary tree: Hardwood species (binary search tree)

Description

Hardwoods is the botanical group of trees that has broad leaves, produce a fruit or nut, and generally go dormant in the Winter.
America ' s temperate climates produce forests with hundreds of hardwood species–trees that share certain biological Chara Cteristics. Although oak, maple and cherry All is types of hardwood trees, for example, they is different species. Together, all the hardwood species represent-percent of the trees in the "states".

On the other hand, softwoods, or conifers, from the Latin word meaning "cone-bearing," has needles. Widely available US softwoods include cedar, fir, hemlock, pine, redwood, spruce and cypress. In a home, the softwoods is used primarily as structural lumber such as 2x4s and 2x6s, with some limited decorative appli Cations.

Using Satellite imaging technology, the Department of Natural Resources have compiled an inventory of every tree standing O n a particular day. You is to compute the total fraction of the tree population represented by each species.
Input

Input to your program consists of a list of the species of the every tree observed by the satellite; One tree per line. No species name exceeds-characters. There is no more than species and no more than 1,000,000 trees.
Output

Print the name of each species represented in the population, in alphabetical order, followed by the percentage of the pop Ulation it represents, to 4 decimal places.
Sample Input

Red Alder
Ash
Aspen
Basswood
Ash
Beech
Yellow Birch
Ash
Cherry
Cottonwood
Ash
Cypress
Red ELM
Gum
Hackberry
White Oak
Hickory
Pecan
Hard Maple
White Oak
Soft Maple
Red Oak
Red Oak
White Oak
Poplan
Sassafras
Sycamore
Black Walnut
Willow
Sample Output

Ash 13.7931
Aspen 3.4483
Basswood 3.4483
Beech 3.4483
Black Walnut 3.4483
Cherry 3.4483
Cottonwood 3.4483
Cypress 3.4483
Gum 3.4483
Hackberry 3.4483
Hard Maple 3.4483
Hickory 3.4483
Pecan 3.4483
Poplan 3.4483
Red Alder 3.4483
Red ELM 3.4483
Red Oak 6.8966
Sassafras 3.4483
Soft Maple 3.4483
Sycamore 3.4483
White Oak 10.3448
Willow 3.4483
Yellow Birch 3.4483
Hint

This problem have huge input, use scanf instead of CIN to avoid time limit exceeded.
Source

Waterloo Local 2002.01.26

#include <cstdio> #include <cstring> #include <cstdlib> #include <iostream> using namespace std;
    struct Node {node *left,*right;
    Char s[39];
int cnt;
};
int n=0;
node * root;
        void Cal (node *root) {if (root!=null) {cal (Root->left);
        printf ("%s%.4f\n", Root->s, ((double) root->cnt)/((double) n) *100);
    Cal (Root->right);
        }} void Inserttree (node **root,char * a) {if (*root==null) {node *ne= (node *) malloc (sizeof (node));
        ne->left=ne->right=null;
        ne->cnt=1;
        strcpy (Ne->s,a);
    *root=ne;
    } else if (!strcmp (*root)->s,a) {(*root)->cnt) + +;
    } else if (strcmp (*root)->s,a) >0) Inserttree (& ((*root)->left), a);
Else Inserttree (& (*root)->right), a);
    } int main () {char s[31];
        while (gets (s)!=null) {Inserttree (&root, s);
    n++;
    } cal (Root);
return 0;
 }