Hardwood Species
| Time Limit: 10000MS | Memory Limit: 65536K | |
| Total Submissions: 23210 | Accepted: 9032 |
Description
Hardwoods
(硬木) are the
botanical
(植物学的) group of trees that have broad leaves, produce a fruit or nut, and generally go
dormant
(休眠的) in the winter.
America's temperate (温和的) climates produce forests with hundreds of hardwood species (物种) -- trees that share certain biological (生物的) characteristics (特征). Although oak, maple and cherry (樱桃) all are types of hardwood trees, for example, they are different species. Together, all the hardwood species represent 40 percent of the trees in the United States.
On the other hand, softwoods (软木材), or conifers (针叶树), from the Latin word meaning "cone-bearing," have needles. Widely available US softwoods include cedar (雪松), fir, hemlock (铁杉), pine, redwood (红木树), spruce (云杉) and cypress (柏树). In a home, the softwoods are used primarily as structural (结构的) lumber (木材) such as 2x4s and 2x6s, with some limited decorative (装饰性的) applications.
Using satellite imaging technology, the Department of Natural Resources has compiled (编译) an inventory (存货) of every tree standing on a particular day. You are to compute the total fraction (分数) of the tree population represented by each species.
America's temperate (温和的) climates produce forests with hundreds of hardwood species (物种) -- trees that share certain biological (生物的) characteristics (特征). Although oak, maple and cherry (樱桃) all are types of hardwood trees, for example, they are different species. Together, all the hardwood species represent 40 percent of the trees in the United States.
On the other hand, softwoods (软木材), or conifers (针叶树), from the Latin word meaning "cone-bearing," have needles. Widely available US softwoods include cedar (雪松), fir, hemlock (铁杉), pine, redwood (红木树), spruce (云杉) and cypress (柏树). In a home, the softwoods are used primarily as structural (结构的) lumber (木材) such as 2x4s and 2x6s, with some limited decorative (装饰性的) applications.
Using satellite imaging technology, the Department of Natural Resources has compiled (编译) an inventory (存货) of every tree standing on a particular day. You are to compute the total fraction (分数) of the tree population represented by each species.
Input
Input
(投入) to your program consists of a list of the
species
(物种) of every tree observed by the satellite; one tree per line. No species name
exceeds
(超过) 30 characters. There are no more than 10,000 species and no more than 1,000,000 trees.
Output
Print the name of each species represented in the population, in
alphabetical
(字母的) order, followed by the percentage of the population it represents, to 4
decimal
(小数) 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 has huge input, use scanf instead of cin to avoid time limit exceeded.
Source
#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;struct node
{int x;struct node *next[130];node(){x=0;memset(next,0,sizeof(next));}
};struct node *root = NULL;
int n;void build(char *s)
{struct node *p=root,*tmp;for(int i=0;s[i];i++){if(p->next[s[i]]==NULL){tmp=new node;p->next[s[i]]=tmp;}p=p->next[s[i]];}p->x++;};void dfs(node *root)
{static char word[31];static int pos;int i;if(root->x) //如果cnt不为0，则肯定找到了一个单词{word[pos]='\0';if(word[0])printf("%s %.4lf\n",word,root->x*100*1.0/n);}for(i=0;i<128;i++){if(root->next[i]){word[pos++]=i;dfs(root->next[i]);pos--;}}
}int main()
{char str[31];n=0;root=new node;while(gets(str)&&str!=""){build(str);n++;}dfs(root);return 0;
}