View Compilation Error

0_0_6413385_19335.cpp: In function `int tarjan(int, int)':
0_0_6413385_19335.cpp:41: error: `tm' undeclared (first use this function)
0_0_6413385_19335.cpp:41: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6413385_19335.cpp: In function `int main()':
0_0_6413385_19335.cpp:91: error: `tm' undeclared (first use this function)