POJ 2418Hardwood Species(搜索二叉树)
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Hardwood Species
Time Limit: 10000MS Memory Limit: 65536KTotal Submissions: 23976 Accepted: 9303
Description
Hardwoods are the botanical group of trees that have 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 characteristics. Although oak, maple and cherry 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, or conifers, from the Latin word meaning "cone-bearing," have needles. Widely available US softwoods include cedar, fir, hemlock, pine, redwood, spruce and cypress. In a home, the softwoods are used primarily as structural lumber such as 2x4s and 2x6s, with some limited decorative applications.
Using satellite imaging technology, the Department of Natural Resources has compiled an inventory of every tree standing on a particular day. You are to compute the total fraction of the tree population represented by each species.
America's temperate climates produce forests with hundreds of hardwood species -- trees that share certain biological characteristics. Although oak, maple and cherry 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, or conifers, from the Latin word meaning "cone-bearing," have needles. Widely available US softwoods include cedar, fir, hemlock, pine, redwood, spruce and cypress. In a home, the softwoods are used primarily as structural lumber such as 2x4s and 2x6s, with some limited decorative applications.
Using satellite imaging technology, the Department of Natural Resources has compiled an inventory of every tree standing on a particular day. You are 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 every tree observed by the satellite; one tree per line. No species name exceeds 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 order, followed by the percentage of the population it represents, to 4 decimal places.
Sample Input
Red AlderAshAspenBasswoodAshBeechYellow BirchAshCherryCottonwoodAshCypressRed ElmGumHackberryWhite OakHickoryPecanHard MapleWhite OakSoft MapleRed OakRed OakWhite OakPoplanSassafrasSycamoreBlack WalnutWillow
Sample Output
Ash 13.7931Aspen 3.4483Basswood 3.4483Beech 3.4483Black Walnut 3.4483Cherry 3.4483Cottonwood 3.4483Cypress 3.4483Gum 3.4483Hackberry 3.4483Hard Maple 3.4483Hickory 3.4483Pecan 3.4483Poplan 3.4483Red Alder 3.4483Red Elm 3.4483Red Oak 6.8966Sassafras 3.4483Soft Maple 3.4483Sycamore 3.4483White Oak 10.3448Willow 3.4483Yellow Birch 3.4483
Hint
This problem has huge input, use scanf instead of cin to avoid time limit exceeded.
题意:输入一些串,按字典序输出他们并且输出他在所有中的百分比。
题解:搜索二叉树,一直出错,全错在一个return上,注意strcmp(L->data,key)= 0时,不调用递归就加上一个return;
#include <iostream>#include <stdio.h>#include <string.h>#include <stdlib.h>using namespace std;int sum;typedef char element;typedef struct Tinode{ element data[35]; int num; Tinode *rchild, *lchild;} Tinode, *BiTree;void creatTree(BiTree &L, element key[]){ if(L==NULL) { L=new Tinode; strcpy(L->data, key); L->num = 1; L->lchild=NULL; L->rchild=NULL; return ; } else { if(strcmp(L->data, key) > 0) { creatTree(L->lchild, key); } else if(strcmp(L->data, key) < 0) { creatTree(L->rchild, key); } else { L->num++; return;//***** } }}void Order(BiTree L){ if(L) { Order(L->lchild); printf("%s %.4f\n",L->data, 100.0*L->num/sum); Order(L->rchild); }}int main(){ char str[35]; BiTree L; L=NULL; sum = 0; while(gets(str)) { creatTree(L, str); sum++; } Order(L); return 0;}
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