View Compilation Error

0_0_39790546_180.cpp: In function 'void getnext(std::string)':
0_0_39790546_180.cpp:6:9: error: 'nxt' was not declared in this scope
    6 |         nxt[1] = 0;
      |         ^~~
0_0_39790546_180.cpp: In function 'int main()':
0_0_39790546_180.cpp:20:18: error: 'j' was not declared in this scope
   20 |         int i =1;j=1;
      |                  ^
0_0_39790546_180.cpp:30:27: error: 'nxt' was not declared in this scope
   30 |                 else j  = nxt[j];
      |                           ^~~