Water题

全部换成小写+去标点即可。

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef map<string, ll>::iterator it;
map<string, ll> s;
ll n, k, ans;
string x, str;
string tolower(string x) {
	string res;
	for (int i = 0; i < x.size(); i ++)
		if (islower(x[i]) || isupper(x[i])) 
			res.push_back(tolower(x[i]));
	return res;
}
int main() {
	while (cin >> x)
		s[tolower(x)] ++;
	for (it i = s.begin(); i != s.end(); i ++)
		if (i->second > ans) ans = i->second, str = i->first;
	cout << str << ' ' << ans << '\n';
	return 0;
}