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: Wrong Answer)

#include <stdio.h>
#include <string.h>
int main(void){
    int n,x,ans=1;
    scanf("%d",&n);
    char s[n][11];
    for(int i=0; i<n; i++)
        scanf("%s",s[i]);
    for(int i=1; i<n; i++){
        x=0;
        for(int j=i+1; j<n&&x==0; j++){
            if(strcmp(s[i],s[j])==0){
                x=1;
            }
            if(x==0)
                ans++;
        }
    }
    printf("%d",ans);
}