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;
}