Forgotten measurements

input/code.cpp: In function 'void solve()':
input/code.cpp:17:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for (int i = 0; i < s.size(); i++)
      |                     ~~^~~~~~~~~~

#include <bits/stdc++.h>
#include <iostream>

#define int long long
using namespace std;

void solve()
{
    string s;
    cin >> s;

    int u = 0;
    int d = 0;
    int l = 0;
    int r = 0;

    for (int i = 0; i < s.size(); i++)
    {
        if (s[i] == 'U')
            u++;
        if (s[i] == 'L')
            l++;
        if (s[i] == 'D')
            d++;
        if (s[i] == 'R')
            r++;
            
    }

    cout << min(u, d) + min(l, r);

}

signed main()
{
    int t = 1;
    // cin >> t;
    for (int i = 0; i < t; i++)
        solve();
}

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