View Compilation Error

0_0_2829669_6724.cpp: In function `int main()':
0_0_2829669_6724.cpp:7: error: `_int64' undeclared (first use this function)
0_0_2829669_6724.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2829669_6724.cpp:7: error: expected `;' before "a"
0_0_2829669_6724.cpp:8: error: `N' undeclared (first use this function)
0_0_2829669_6724.cpp:10: error: `i' undeclared (first use this function)
0_0_2829669_6724.cpp:12: error: overloaded function with no contextual type information
0_0_2829669_6724.cpp:13: error: `sum' undeclared (first use this function)
0_0_2829669_6724.cpp:14: error: `M' undeclared (first use this function)
0_0_2829669_6724.cpp:15: error: `j' undeclared (first use this function)
0_0_2829669_6724.cpp:17: error: `a' undeclared (first use this function)