View Compilation Error

0_0_6494993_4736.cpp:62: error: `_int64' does not name a type
0_0_6494993_4736.cpp: In function `int main()':
0_0_6494993_4736.cpp:79: error: `mg' undeclared (first use this function)
0_0_6494993_4736.cpp:79: error: (Each undeclared identifier is reported only once for each function it appears in.)