View Compilation Error

0_0_39153505_26332.cpp: In function 'void solve()':
0_0_39153505_26332.cpp:26:15: error: 'fabs' was not declared in this scope; did you mean 'labs'?
   26 |         while(fabs(r-l) > 1e-8){
      |               ^~~~
      |               labs