Forgotten measurements

input/code.cpp: In function 'int main()':
input/code.cpp:35:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     for (int i = 2; i < n.size(); i++) {
      |                     ~~^~~~~~~~~~

#include <bits/stdc++.h>
using namespace std;
#define endl "\n";

#define PRINT_ARR(arr, n) \
    do { \
        for (int i = 0; i < n; i++) { \
            cout << arr[i] << " "; \
        } \
        cout << endl; \
    } while (0)

typedef long long ll;

int main() {
    string n;
    cin >> n;
    char f=n[0];
    // switch(n[0]) {
    //     case 'U':
    //         f='D';
    //         break;
    //     case 'D':
    //         f='U';
    //         break;
    //     case 'L':
    //         f='R';
    //         break;
    //     case 'R':
    //         f='L';
    //         break; 
    // }
    char s=n[1];
    ll count = 2ll;
    for (int i = 2; i < n.size(); i++) {
        if (n[i] == f || n[i] == s)
            count++;
    }
    cout << count << endl;
    return 0;
}

Test 1

Verdict: WRONG ANSWER

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