View Compilation Error

0_0_16746343_16383.cpp: In function 'void init(int*, int)':
0_0_16746343_16383.cpp:37:37: error: request for member 'mx' in 'mx[(i + -1)][j]', which is of non-class type 'int'
             mx[i][j]=max(mx[i-1][j].mx[i-1][j+(1<<i>>1)]);
                                     ^