效果：

代码：

#include <iostream>
#include <map>
#include <string>
int main()
{
	std::string s;
	//std::cin >> s;
	s = " aaa   aaaaa        a aa  aaa  aaaaaaaaaaaaaaa        aaaaaaaaaaaaaaaaaaa Hi I am a person a a a a a I Hi hi I     AM  FM";
	std::cout << s << std::endl;
	//创建map容器
	std::map<std::string, int>Map;
	//分割单词
	int i, j;
	i = j = 0;
	while (s[i] != '\0')
	{
		while (s[i] == ' ')
		{
			i++;
		}
		j = i;
		while (s[j] != '\0' && s[j] != ' ')
		{
			j++;
		}
		//截取字符串
		std::string tmp = s.substr(i, j - i + 1);
		//std::cout << tmp << std::endl;
		if (Map.find(tmp) == Map.end())
		{
			Map.insert(std::pair<std::string,int>(tmp,1));
		}
		else 
		{
			//auto it = Map.find(tmp);
			//it->second++;
			Map[tmp]++;
		}
		i = j;
	}
	//输出结果
	for (auto it = Map.begin(); it != Map.end(); it++)
	{
		std::cout << it->first << "\t" << it->second << std::endl;
	}
	return 0;
}