A. Magnets Solution

#include<stdio.h>

int main()

{

    int n,i;

    char aa[3],bb[3];

    scanf("%d",&n);

    scanf("%s",aa);

    if (n==1)

        printf("1\n");

    else {

            int count=1;

        for (i=1;i<n;i++){

            scanf("%s",bb);

            if (aa[1]== bb[0]){

                count++;

                aa[0] = bb[0];

                aa[1]=bb[1];

            }

        }

        printf("%d\n",count);

    }

    return 0;

}