View Compilation Error

0_0_39790564_3191.cpp: In function 'void getnext(std::string)':
0_0_39790564_3191.cpp:7:12: error: invalid types 'int[int]' for array subscript
    7 |         nxt[1] = 0;
      |            ^
0_0_39790564_3191.cpp:10:28: error: invalid types 'int[int]' for array subscript
   10 |                         nxt[++i] = ++j;
      |                            ^
0_0_39790564_3191.cpp:12:29: error: invalid types 'int[int]' for array subscript
   12 |                 else j = nxt[j];
      |                             ^
0_0_39790564_3191.cpp: In function 'int main()':
0_0_39790564_3191.cpp:21:18: error: 'j' was not declared in this scope
   21 |         int i =1;j=1;
      |                  ^