View Compilation Error

0_0_6307045_16800.cpp: In function `int main()':
0_0_6307045_16800.cpp:41: error: `_int64' undeclared (first use this function)
0_0_6307045_16800.cpp:41: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6307045_16800.cpp:41: error: expected `;' before "ans"
0_0_6307045_16800.cpp:45: error: `ans' undeclared (first use this function)