2018-12-07acm第三题

#include<iostream>

using namespace std;

int main()

{

int a;

cin >> a;

char b[50];

b[a] = '\0';

int c=0;

cin >> b;

for (int i = 0; i < a-1; i++)

{

if (b[i] == b[i + 1])

c++;

}

cout << c;

}