Forgotten measurements

#include <bits/stdc++.h>
using namespace std;

static int find(string &s, char a, char b) {
    char curr = 0;
    int res = 0;
    char st = 0;
    for (auto c : s) {
        if (!st) st = c;
        if (curr != a && c == a) {
            ++res;
            curr = a;
        } else if (curr != b && c == b) {
            ++res;
            curr = b;
        }
    }
    if (curr == st) {
        --res;
    }
    return res ? res - 1 : res;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    string s;
    cin >> s;
    cout << find(s, 'L', 'R') + find(s, 'U', 'D') << '\n';
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER