View Compilation Error

0_0_16482984_22179.cpp: In function 'void pan(int)':
0_0_16482984_22179.cpp:20:53: error: lvalue required as left operand of assignment
         else if(a[l]==0||(a[l]!=0&&a[l]==a[l+1]+1||l=n-1))
                                                     ^