View Compilation Error

0_0_7112649_19340.cpp: In function `void copy()':
0_0_7112649_19340.cpp:21: error: `tm' undeclared (first use this function)
0_0_7112649_19340.cpp:21: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7112649_19340.cpp: In function `bool judge()':
0_0_7112649_19340.cpp:52: error: `tm' undeclared (first use this function)