View Compilation Error

0_0_6100124_31587.cpp: In function `int main()':
0_0_6100124_31587.cpp:6: error: `_int64' undeclared (first use this function)
0_0_6100124_31587.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6100124_31587.cpp:6: error: expected `;' before "T"
0_0_6100124_31587.cpp:7: error: `T' undeclared (first use this function)
0_0_6100124_31587.cpp:8: error: `i' undeclared (first use this function)
0_0_6100124_31587.cpp:10: error: overloaded function with no contextual type information
0_0_6100124_31587.cpp:10: error: `sum' undeclared (first use this function)
0_0_6100124_31587.cpp:11: error: `N' undeclared (first use this function)
0_0_6100124_31587.cpp:12: error: `j' undeclared (first use this function)
0_0_6100124_31587.cpp:14: error: `num' undeclared (first use this function)