统计输入的单词中不同单词的数量的C++代码

Write a program to count how many times each distinct word appears in its input

#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main() {
	typedef vector<string>::size_type vec_sz;

	vector<string> words;
	vector<int> counts;

	cout << "Words: ";
	string s;

	while (cin >> s) {
		bool found = false;

		for (vec_sz i = 0; i < words.size(); ++i) {
			if (s == words[i]) {
				++counts[i];
				found = true;
			}
		}

		if (!found) {
			words.push_back(s);
			counts.push_back(1);
		}
	}

	for (vec_sz i = 0; i < words.size(); ++i)
		cout << words[i] << " appeared " << counts[i] << " times" << endl;

	return 0;
}

这是Accelerated C++ 中的一个习题，统计输入的单词中不同单词的数量的C++代码，用了一些C++特有的操作，感觉到C++比C语言的强大了。