0_0_39129655_30416.cpp: In function 'int main()':
0_0_39129655_30416.cpp:26:32: error: 'acos' was not declared in this scope
26 | s[i] = acos(-1) * ri * ri;
| ^~~~
0_0_39129655_30416.cpp:30:24: error: 'fabs' was not declared in this scope; did you mean 'labs'?
30 | while (fabs(r-l)>0.0000001)
| ^~~~
| labs
|