View Compilation Error

0_0_1573986_22596.cpp:14: error: `_int64' does not name a type
0_0_1573986_22596.cpp: In function `void update2(int, int)':
0_0_1573986_22596.cpp:39: error: `sum2' undeclared (first use this function)
0_0_1573986_22596.cpp:39: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1573986_22596.cpp: At global scope:
0_0_1573986_22596.cpp:55: error: `_int64' does not name a type
0_0_1573986_22596.cpp: In function `int main()':
0_0_1573986_22596.cpp:79: error: `_int64' undeclared (first use this function)
0_0_1573986_22596.cpp:79: error: expected `;' before "res"
0_0_1573986_22596.cpp:82: error: `res' undeclared (first use this function)
0_0_1573986_22596.cpp:82: error: `read2' undeclared (first use this function)