View Compilation Error

0_0_7923731_25524.cpp:25: error: `_int64' does not name a type
0_0_7923731_25524.cpp:29: error: `ll' does not name a type
0_0_7923731_25524.cpp: In function `void get_r()':
0_0_7923731_25524.cpp:73: error: `sum' undeclared (first use this function)
0_0_7923731_25524.cpp:73: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7923731_25524.cpp: In function `int main()':
0_0_7923731_25524.cpp:123: error: `sum' undeclared (first use this function)