View Compilation Error

0_0_2869735_32182.cpp:14: error: `_int64' does not name a type
0_0_2869735_32182.cpp:47: error: `_int64' does not name a type
0_0_2869735_32182.cpp: In function `int main()':
0_0_2869735_32182.cpp:76: error: `hash' undeclared (first use this function)
0_0_2869735_32182.cpp:76: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2869735_32182.cpp:77: error: `dfs' undeclared (first use this function)