View Compilation Error

0_0_39454769_21153.cpp: In function 'void solve()':
0_0_39454769_21153.cpp:42:13: error: 'imt' was not declared in this scope; did you mean 'int'?
   42 |             imt t0=t-_+1;
      |             ^~~
      |             int
0_0_39454769_21153.cpp:43:32: error: 't0' was not declared in this scope; did you mean 't2'?
   43 |             string t2=b.substr(t0,_);
      |                                ^~
      |                                t2