View Compilation Error

0_0_39123175_24093.cpp: In function 'int main()':
0_0_39123175_24093.cpp:8:24: error: 'sqrt' was not declared in this scope
    8 |     int y1 = (int)ceil(sqrt(n)), y2 = (int)ceil(sqrt(m));
      |                        ^~~~
0_0_39123175_24093.cpp:8:19: error: 'ceil' was not declared in this scope
    8 |     int y1 = (int)ceil(sqrt(n)), y2 = (int)ceil(sqrt(m));
      |                   ^~~~
0_0_39123175_24093.cpp:9:55: error: 'y2' was not declared in this scope; did you mean 'x2'?
    9 |     int x1 = (n - ((y1-1) * (y1-1))+1)/2, x2 = (m - ((y2-1) * (y2-1))+1)/2;
      |                                                       ^~
      |                                                       x2