STLmap

long好用

#include<bits/stdc++.h>
using namespace std;
map<string,long> mp;
int main(){
    long n; cin >> n;
    for(int i = 1;i <= n;i++){
        string t; cin >> t;
        mp[t]++;
    }
    long maxx = -1;
    for(auto i : mp) maxx = max(maxx,i.second);
    cout << maxx;
    return 0;
}