View Compilation Error

0_0_11136284_905.cpp:3: error: `_int64' does not name a type
0_0_11136284_905.cpp: In function `int func(int)':
0_0_11136284_905.cpp:6: error: `str' undeclared (first use this function)
0_0_11136284_905.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11136284_905.cpp: In function `int main()':
0_0_11136284_905.cpp:13: error: `_int64' undeclared (first use this function)
0_0_11136284_905.cpp:13: error: expected `;' before "sum"
0_0_11136284_905.cpp:14: error: `str' undeclared (first use this function)
0_0_11136284_905.cpp:21: error: `sum' undeclared (first use this function)