View Compilation Error

0_0_16435411_7000.cpp:5:26: error: conflicting declaration 'int f'
 int k,m,n,sx,sy,dx,dy,nx,f;
                          ^
0_0_16435411_7000.cpp:4:6: note: previous declaration as 'bool f'
 bool f,vis[10][10];
      ^