View Compilation Error

0_0_3140458_11840.cpp: In function `int main()':
0_0_3140458_11840.cpp:3: error: `_int64' undeclared (first use this function)
0_0_3140458_11840.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3140458_11840.cpp:3: error: expected `;' before "da"
0_0_3140458_11840.cpp:4: error: `da' undeclared (first use this function)
0_0_3140458_11840.cpp:7: error: `i' undeclared (first use this function)
0_0_3140458_11840.cpp:10: error: `n' undeclared (first use this function)
0_0_3140458_11840.cpp:12: error: `j' undeclared (first use this function)