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 (Clang 10.0.0) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct _list {
  char str[11];
  int len;
  struct _list *next;
}List;

int main(void) {

  int n;
  scanf("%d", &n);
  List *list = calloc(1, sizeof(List));
  int list_num = 0;
  for(int i = 0;i < n;i++) {
    char s[11];
    scanf("%s", s);
    int count = 1;
    for(List *data = list;data != NULL;data = data->next) {
      if(s[0] == data->str[0] && strlen(s) == data->len) {
        if(strcmp(s, data->str) == 0) {
          count = 0;
          break;
        }
      } else {
        if(s[0] > data->str[0]) {
          break;
        }
      }
    }
    if(count != 0) {
      List *data = list;
      int flag = -1;
      while(data != NULL) {
        if(s[0] == data->str[0]) {
          List *l = calloc(1, sizeof(List));
          strcpy(l->str, s);
          l->len = strlen(s);
          l->next = data->next;
          data->next = l;
          flag = 0;
          break;
        } else {
          if(s[0] < data->str[0]) continue;
          if(s[0] > data->str[0]) break;
        }
        data = data->next;
      }
      if(flag) {
        List *l = calloc(1, sizeof(List));
        strcpy(l->str, s);
        l->len = strlen(s);
        if(s[0] < data->str[0]) {
          l->next = list;
          list = l;
        } else if(s[0] > data->str[0]) {
          l->next = NULL;
          data->next = l;
        }
      }
      list_num++;
    }
  }
  printf("%d\n", list_num);

  return 0;
}