748 C. Santa Claus and Robot codeforces

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    string str;
    cin>>n>>str;
    int n1=0,n2=0,sum=0;
    for(int i=0;i<str.size();i++)
    {
        if(str[i]=='L')
        {
            if(n1==2)
            {
                sum++;
                n2=0;
            }
            n1=1;
        }
        if(str[i]=='R')
        {
            if(n1==1)
            {
                sum++;
                n2=0;
            }
            n1=2;
        }
        if(str[i]=='U')
        {
            if(n2==2)
            {
                sum++;
                n1=0;
            }
            n2=1;
        }
        if(str[i]=='D')
        {
            if(n2==1)
            {
                sum++;
                n1=0;
            }
            n2=2;
        }
    }
    cout<<sum+1<<endl;
    return 0;
}