c++ 的map第一个例子

#include <string>
#include <iostream>
#include <map>
using namespace std;
int main()
{
map<string,size_t> word_count;
string word;
while(cin >> word)
{
 ++ word_count[word];
}

for(const auto & w : word_count)
  {
    cout  << w.first << " occurs " << w.second <<
            (w.second > 1 ? "times":"time") << endl;
  }
    return 0;
}

运行如下：

输入

a b abc school school you are a can canner

输出

a occurs 2times
abc occurs 1time
are occurs 1time
b occurs 1time
can occurs 1time
canner occurs 1time
school occurs 2times
you occurs 1time

map和python里面的字典类型相似，用python编写同类型的代码如下：

dict1 = {}
while True:
    word = input("")  #这里注意python中的input是以'\n'为界的，每次输入后都得换行'\n'
    if word == 'q':
        break
    if word in dict1.keys():
        dict1[word] += 1
    else:
        dict1[word] = 1
str1 = ''
for key in dict1.keys():
    if dict1[key] > 1:
        str1 = 'times'
    else:
        str1 = 'time'
    print(key + " occurs " + str(dict1[key]) + str1)

在ubuntu中运行如下：

r@r:~/coml_/python/test$ python3 1.py
Enter a name(enter 'q' to quit):a
Enter a name(enter 'q' to quit):b
Enter a name(enter 'q' to quit):c
Enter a name(enter 'q' to quit):a
Enter a name(enter 'q' to quit):b
Enter a name(enter 'q' to quit):q
a occurs 2times
b occurs 2times
c occurs 1time