View Compilation Error

0_0_3871819_3215.cpp: In function `int main()':
0_0_3871819_3215.cpp:5: error: `_int64' undeclared (first use this function)
0_0_3871819_3215.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3871819_3215.cpp:5: error: expected `;' before "i"
0_0_3871819_3215.cpp:6: error: `i' undeclared (first use this function)
0_0_3871819_3215.cpp:9: error: `max' undeclared (first use this function)
0_0_3871819_3215.cpp:10: error: `sum' undeclared (first use this function)
0_0_3871819_3215.cpp:11: error: `j' undeclared (first use this function)
0_0_3871819_3215.cpp:12: error: `k' undeclared (first use this function)
0_0_3871819_3215.cpp:14: error: `a' undeclared (first use this function)