View Compilation Error

0_0_6567791_7700.cpp: In function `void solve()':
0_0_6567791_7700.cpp:55: error: `tm' undeclared (first use this function)
0_0_6567791_7700.cpp:55: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6567791_7700.cpp: In function `int main()':
0_0_6567791_7700.cpp:96: error: `tm' undeclared (first use this function)