出现最多的是哪个词

运行下面这段程序：

#include <iostream>
#include <string>
#include <utility>
#include <vector>
using namespace std;
#include <unordered_map>

int main() {
    vector<string> words = {"苹果", "香蕉", "苹果", "梨", "香蕉", "苹果"};
    unordered_map<string, int> count;
    for (const string& w : words) count[w] = count[w] + 1;
    string best;
    for (const auto& kv : count) {
        if (best.empty() || kv.second > count[best]) best = kv.first;
    }
    cout << best << endl;
}

（本题用 g++ -std=c++17 -O0 编译。）