View Compilation Error

0_0_8754567_26134.cpp: In function `void prim(int, int*, int)':
0_0_8754567_26134.cpp:22: error: `used' undeclared (first use this function)
0_0_8754567_26134.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8754567_26134.cpp:40: error: `closeset' undeclared (first use this function)