View Compilation Error

0_0_10280426_2801.cpp:77: error: `_int64' does not name a type
0_0_10280426_2801.cpp:78: error: `_int64' does not name a type
0_0_10280426_2801.cpp: In function `int main()':
0_0_10280426_2801.cpp:86: error: `res' undeclared (first use this function)
0_0_10280426_2801.cpp:86: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10280426_2801.cpp:87: error: `sum' undeclared (first use this function)
0_0_10280426_2801.cpp:125: error: `_int64' undeclared (first use this function)
0_0_10280426_2801.cpp:125: error: expected `;' before "ans"
0_0_10280426_2801.cpp:128: error: `ans' undeclared (first use this function)
0_0_10280426_2801.cpp:134: error: expected `;' before "all"
0_0_10280426_2801.cpp:135: error: `all' undeclared (first use this function)