View Compilation Error

0_0_30261014_24148.cpp: In function 'long long int solve(long long int)':
0_0_30261014_24148.cpp:48:11: error: 'x' was not declared in this scope
     while(x)
           ^
0_0_30261014_24148.cpp:56:18: error: 'pos' was not declared in this scope
         ans+=dfs(pos-1,true,i,0);
                  ^
0_0_30261014_24148.cpp:58:16: error: 'pos' was not declared in this scope
     return ans-pos+1;
                ^