Problem:
Score : 300 points

Problem Statement

There are N slimes lining up from left to right. The colors of these slimes will be given as a string S of length N consisting of lowercase English letters. The i-th slime from the left has the color that corresponds to the i-th character of S.

Adjacent slimes with the same color will fuse into one larger slime without changing the color. If there were a slime adjacent to this group of slimes before fusion, that slime is now adjacent to the new larger slime.

Ultimately, how many slimes will be there?

Constraints

1 \leq N \leq 10^5

|S| = N

S consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

N
S

Output

Print the final number of slimes.

Sample Input 1

10
aabbbbaaca

Sample Output 1

5

Ultimately, these slimes will fuse into abaca.

Sample Input 2

5
aaaaa

Sample Output 2

1

All the slimes will fuse into one.

Sample Input 3

20
xxzaffeeeeddfkkkkllq

Sample Output 3

10

Solution in C (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
#include<string.h>
int main(){
    int n;
    char s[100001];
    scanf("%d",&n);
    scanf("%s",s);
    int l = strlen(s);
    //printf("%d\n",l);
    int j=0;
    int count = l;
    while(j<=l-1){
        int m = 1;
        while(s[j]==s[j+m]){
           // printf("j=%d,s[j]=%c,s[j+1]=%c\n",j,s[j],s[j+m]);
            count--;
            m++;
        }
        j += m;
    }
    printf("%d\n",count);
    return 0;
}