Hardwood Species(利用STL中自带的排序功能编程的实验范例)
2014-07-22 14:07
393 查看
Submit Status
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.
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
Sample Output
Hint
This problem has huge input, use scanf instead of cin to avoid time limit exceeded.
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.
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 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.
#include <map> #include<stdio.h> #include <string> #include <iostream> #include <algorithm> using namespace std; int main() { map<string,int> m; map<string,int>::const_iterator index; string a; int n=0; while(getline(cin,a)) { ++m[a]; n++; } for(index = m.begin(); index != m.end(); index++){ cout << index->first<<" "; printf("%.4f\n",(float)(100*index->second)/float(n));} return 0; }
相关文章推荐
- (经典map)A - Hardwood Species(7.1.1)(利用STL中自带的排序功能编程的实验范例)
- (经典map)A - Hardwood Species(7.1.1)(利用STL中自带的排序功能编程的实验范例)
- A - Hardwood Species(7.1.1)(利用STL中自带的排序功能编程的实验范例)
- (使用STL自带的排序功能7.1.1)POJ 2418 Hardwood Species(map的定义、访问、迭代)
- (STL中自带的排序功能7.3.3)POJ 1318 Word Amalgamation(求解一个单词是否在字典里面。解法:将单词按字典序处理后的结果与字典中的单词安字典序处理后的结果进行比较)
- (使用STL自带的排序功能进行排序7.3.12)UVA 11057 Exact Sum(在一组数据中找到这么两个数,使得他们的和等于指定数&&且这两个数之间的差值最小)
- (STL自带的排序功能的使用7.1.2)POJ 2388 Who's in the Middle(sort()函数的使用)
- (使用STL自带的排序功能进行排序7.3.7)POJ 2726 Holiday Hotel(结构体排序)
- (使用STL自带的排序功能进行排序)POJ 1877 Flooded!()
- (使用STL自带的排序功能进行排序7.3.2)POJ 2092 Grandpa is Famous(结构体排序)
- (使用STL自带的排序功能进行排序)UVA 10905 Children's Game(求一组数据所能拼出的最大数字串)
- C - Ultra-QuickSort(7.2.2)(7.2应用排序算法编程的实验范例)
- (使用STL自带的排序函数进行编程7.3.14)UVA 10062 Tell me the frequencies!(求一个字符出现的次数(包括字母和数字)&&按出现的次数降序)
- (使用STL自带的排序功能进行排序7.3.2)POJ 2092 Grandpa is Famous(结构体排序)
- (STL自带的排序功能7.1.3)POJ 2379 ACM Rank Table(结构体的排序、初始化)
- 通用排序函数的功能实现(利用接口和委托实现泛型[通用]排序)
- 利用Adobe Acrobat 7.0 Professional 自带的导出图片的功能(转)
- 如何利用ppt自带的图片处理功能进行图片“扣图”
- 10年磨一剑,软件编程走火入魔之:把简单的功能做个彻彻底底、把劳动成果重复利用
- 10年磨一剑,软件编程走火入魔之:把简单的功能做个彻彻底底、把劳动成果重复利用