View Compilation Error

0_0_4474344_11737.cpp: In function `int main()':
0_0_4474344_11737.cpp:8: error: `_int64' undeclared (first use this function)
0_0_4474344_11737.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4474344_11737.cpp:8: error: expected `;' before "a"
0_0_4474344_11737.cpp:9: error: `a' undeclared (first use this function)
0_0_4474344_11737.cpp:11: error: `n' undeclared (first use this function)
0_0_4474344_11737.cpp:12: error: `max' undeclared (first use this function)
0_0_4474344_11737.cpp:13: error: `sum' undeclared (first use this function)
0_0_4474344_11737.cpp:15: error: `num' undeclared (first use this function)