View Compilation Error

0_0_39538967_1731.cpp: In function 'void cdq(int, int)':
0_0_39538967_1731.cpp:57:22: error: 't' was not declared in this scope
   57 |                 if(f[t[lp]] <= f[t[rp]])
      |                      ^
0_0_39538967_1731.cpp:62:39: error: 't' was not declared in this scope
   62 |         while(lp <= mid) id[tot ++] = t[lp ++];
      |                                       ^
0_0_39538967_1731.cpp:63:37: error: 't' was not declared in this scope
   63 |         while(rp <= r) id[tot ++] = t[rp ++];
      |                                     ^