题解 | 小红背单词

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    map<string, int> word_lookup;
    cin >> n;
    int num_mem_word = 0;
    for (int id = 0; id != n; ++id) {
        string new_word;
        cin >> new_word;
        if (word_lookup[new_word] == -1) {
            continue;
        }
        else{
            ++word_lookup[new_word];
            if (word_lookup[new_word] > num_mem_word) {
                word_lookup[new_word] = -1;
                ++num_mem_word;
            }
        }
    }
    cout << num_mem_word;
    return 0;
}