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

void swap(int *a,int *b){
    int w;
    w=*a;*a=*b;*b=w;
}

void HEAP(int *heap,int n){
    int s,p,i;
    swap(&heap[0], &heap[n]);
    for (i=1; i<n; i++) {
        s=i;p=s/2;
        while (s>=2&&heap[p]>heap[s]) {
            swap(&heap[p], &heap[s]);
            s=p;p=s/2;
        }
    }
}

void HEAP_SORT(int *heap,int n){
    int s,p;
    while (n>1) {
        swap(&heap[1], &heap[n]);n--;
        p=1;s=2;
        while (s<=n) {
            if (s<n&&heap[s+1]<heap[s]) s++;
            if (heap[p]<=heap[s]) break;
            swap(&heap[p], &heap[s]);
            p=s;s=2*p;
        }
    }
}

int main(){
    int n,i,m,count=0,s,p;
    char str[200001][11]={};
    char token[1000]={},temp[1000]={};
    fgets(token, sizeof(token), stdin);
    n=atoi(token);
    for (i=0; i<n; i++) fgets(str[i], sizeof(str[i]), stdin);
    
    strcpy(temp, str[0]);strcpy(str[0], str[n]);strcpy(str[n], temp);
    for (i=1; i<n; i++) {
        s=i;p=s/2;
        while (s>=2&&str[p]>str[s]) {
            strcpy(temp, str[p]);strcpy(str[p], str[s]);strcpy(str[s], temp);
            s=p;p=s/2;
        }
    }
    
    m=n;
    while (m>1) {
        strcpy(temp, str[1]);strcpy(str[1], str[m]);strcpy(str[m], temp);m--;
        p=1;s=2;
        while (s<=m) {
            if (s<m&&str[s+1]<str[s]) s++;
            if (str[p]<=str[s]) break;
            strcpy(temp, str[p]);strcpy(str[p], str[s]);strcpy(str[s], temp);
            p=s;s=2*p;
        }
    }
    
    for (i=1; i<n+1; i++) {
        if (strcmp(str[i], str[i+1])!=0) count++;
    }
    
    printf("%d",count);
    return 0;
}