View Compilation Error

0_0_39388134_13777.cpp: In function 'double distance(int, int, int, int)':
0_0_39388134_13777.cpp:56:12: error: 'sqrt' was not declared in this scope
   56 |     return sqrt((x0-x1)*(x0-x1)+(y0-y1)*(y0-y1));
      |            ^~~~