View Compilation Error

0_0_10903465_14454.cpp: In function `int main()':
0_0_10903465_14454.cpp:8: error: `_int64' undeclared (first use this function)
0_0_10903465_14454.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10903465_14454.cpp:8: error: expected `;' before "ans"
0_0_10903465_14454.cpp:23: error: `ans' undeclared (first use this function)