View Compilation Error

0_0_39108745_31985.cpp: In function 'int main()':
0_0_39108745_31985.cpp:53:26: error: invalid types 'ld {aka long double}[ll {aka long long int}]' for array subscript
   53 |                         x[i * 2 - 1] = x;
      |                          ^
0_0_39108745_31985.cpp:54:26: error: invalid types 'ld {aka long double}[ll {aka long long int}]' for array subscript
   54 |                         x[i * 2] = xx;
      |                          ^