Problem:
Score : 300 points

Problem Statement

You drew lottery N times. In the i-th draw, you got an item of the kind represented by a string S_i.

How many kinds of items did you get?

Constraints

1 \leq N \leq 2\times 10^5

S_i consists of lowercase English letters and has a length between 1 and 10 (inclusive).

Input

Input is given from Standard Input in the following format:

N
S_1
:
S_N

Output

Print the number of kinds of items you got.

Sample Input 1

3
apple
orange
apple

Sample Output 1

2

You got two kinds of items: apple and orange.

Sample Input 2

5
grape
grape
grape
grape
grape

Sample Output 2

1

Sample Input 3

4
aaaa
a
aaa
aa

Sample Output 3

4

Solution in C++ (GCC 9.2.1) (judge verdict: Time Limit Exceeded)

#include <bits/stdc++.h>
#include <vector>

using namespace std;
const double PI=3.14159265358979323846;

#define SIZE_OF_ARRAY(array) (sizeof(array)/sizeof(array[0]))


int main() {

	int N;

	cin >> N;

	vector<string> v;

	int count = 0;

	string tmp;
	for (int i = 0; i < N; i++) {
		cin >> tmp;
		bool is = true;

		for (int j = 0; j < v.size(); j++) {
			if (tmp.compare(v[j]) == 0) {
				is = false;
				break;
			}
		}

		if(is) {/*
			int num = 0;
			for (int i = 0; i < N; i++) {
				if (v[i].compare("") == 0){
					num = i;
					break;
				}
			}
*/
			v.push_back(tmp);
		}
	}

	count = v.size();
/*
	for (int i = 0; i < N; i++) {
		if (v[i].compare("") != 0){ count++;
		}
	}
*/
	cout << count << endl;
}

/*
	string v[N] = {""};

	string tmp;
	int count = 0;
	for (int i = 0; i < N; i++) {
		cin >> tmp;

		bool is = true;
		for (int i = 0; i < N; i++) {
			if(v[i].compare(tmp) == 0) { is = false; break;}
		}

		if(is) {
			int num = 0;
			for (int i = 0; i < N; i++) {
				if (v[i].compare("") == 0){
					num = i;
					break;
				}
			}

			v[num] = tmp;
		}
	}

	for (int i = 0; i < N; i++) {
		if (v[i].compare("") != 0){ count++;
		}
	}

	cout << count << endl;
	*/