View Compilation Error

0_0_21185675_9561.cpp: In function 'int main()':
0_0_21185675_9561.cpp:60:11: error: 'h' was not declared in this scope
    memset(h,0,sizeof(h));
           ^
0_0_21185675_9561.cpp:61:12: error: 't' was not declared in this scope
     memset(t,0,sizeof(t));
            ^
0_0_21185675_9561.cpp:62:13: error: 'nxt' was not declared in this scope
      memset(nxt,0,sizeof(nxt));
             ^