Robot Instructions

#include<bits/stdc++.h>
using namespace std;
int main(void)
{
    int t, n;
    while(cin >> t)
    {
        while(t--)
        {
            cin >> n;
            getchar();

            char str[n][15];
            int pos = 0;

            for(int i = 0; i < n; i++)
            {
                gets(str[i]);
                if(strcmp(str[i], "LEFT") == 0)
                    pos--;
                else if(strcmp(str[i], "RIGHT") == 0)
                    pos++;
                else
                {
                    int b = 1, ind = 0;
                    for(int j = strlen(str[i]) - 1; j >= 0 ; j--)
                    {
                        if(str[i][j] >= '0' && str[i][j] <= '9')
                        {
                            ind += (str[i][j] - '0') * b;
                            b *= 10;
                        }
                    }
                    ind--;
                    if(strcmp(str[ind], "LEFT") == 0)
                        pos--;
                    else if(strcmp(str[ind], "RIGHT") == 0)
                        pos++;
                    strcpy(str[i], str[ind]);
                }
            }
            cout << pos << endl;
        }
    }
    return 0;
}