View Compilation Error

0_0_12174722_4588.cpp: In function `long long int dis(Point, Point)':
0_0_12174722_4588.cpp:39: error: `tm' undeclared (first use this function)
0_0_12174722_4588.cpp:39: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12174722_4588.cpp: In function `int main()':
0_0_12174722_4588.cpp:86: error: `tm' undeclared (first use this function)