View Compilation Error

0_0_6203198_29962.cpp: In function `int main()':
0_0_6203198_29962.cpp:7: error: `_int64' undeclared (first use this function)
0_0_6203198_29962.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6203198_29962.cpp:7: error: expected `;' before "f"
0_0_6203198_29962.cpp:14: error: `k' undeclared (first use this function)
0_0_6203198_29962.cpp:17: error: `f' undeclared (first use this function)