CodeForces #200（Div.2） A. Magnets

#include <stdio.h>

int main() {
char a[5];
int n,
cnt = 0,
flag = -1;
scanf("%d", &n);
for(int i = 0; i < n; i++) {
scanf("%s", a);
int type;
if(a[0] == '0')
type = 0;
else
type = 1;
if(flag != type)
++cnt;
flag = type;
}
printf("%d\n", cnt);
return 0;
}