View Compilation Error

0_0_6071975_29323.cpp:25: error: `_int64' does not name a type
0_0_6071975_29323.cpp: In function `int main()':
0_0_6071975_29323.cpp:59: error: `_int64' undeclared (first use this function)
0_0_6071975_29323.cpp:59: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6071975_29323.cpp:59: error: expected `;' before "val"
0_0_6071975_29323.cpp:65: error: `val' undeclared (first use this function)
0_0_6071975_29323.cpp:65: error: `sum' undeclared (first use this function)