View Compilation Error

0_0_20662842_21358.cpp: In function 'int main()':
0_0_20662842_21358.cpp:51:71: error: lvalue required as left operand of assignment
                       if(abs(A[j].x-A[j].y)==abs(A[j-1].x-A[j-1].y)||j=m-1)
                                                                       ^