View Compilation Error

0_0_12252555_31282.cpp: In function `double dis(node, node)':
0_0_12252555_31282.cpp:18: error: `sqrt' undeclared (first use this function)
0_0_12252555_31282.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12252555_31282.cpp: In function `double find(int, int)':
0_0_12252555_31282.cpp:32: error: `fabs' undeclared (first use this function)