题目链接:https://vjudge.net/problem/CodeForces-266A
#include <iostream>
using namespace std;
int main()
{
int n,i,sum=0;
cin >> n;
if (n > 50 || n < 1)
return 0;
char *s,c;
s = (char*)malloc((n) * sizeof(char));
for (i = 0; i < n; i++)
{
cin >> c;
s[i] = c;
}
for (i = 0; i < n; i++)
if (s[i] == s[i + 1])
sum = sum + 1;
cout << sum;
}