Stones

input/code.cpp: In function 'int main()':
input/code.cpp:16:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 1; i < s.length(); i++) {
                                ^

#include <bits/stdc++.h>
#define ll long long
#define N (1<<17)
#define ld long double
#define F first
#define S second
#define INF 1000111000
#define M 1000000007

using namespace std;

int main () {
  string s;
  cin>>s;
  int ans = 0;
  for (int i = 1; i < s.length(); i++) {
    if (s[i] == s[i - 1]) ans++;
  }
  cout<<ans<<endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED