View Compilation Error

0_0_11339886_18706.cpp:1:25: bits/stdc++.h: No such file or directory
0_0_11339886_18706.cpp: In function `ll lcm(ll, ll)':
0_0_11339886_18706.cpp:10: error: `__gcd' undeclared (first use this function)
0_0_11339886_18706.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11339886_18706.cpp: In function `int main()':
0_0_11339886_18706.cpp:17: error: `cin' undeclared (first use this function)
0_0_11339886_18706.cpp:24: error: `cout' undeclared (first use this function)
0_0_11339886_18706.cpp:25: error: `max' undeclared (first use this function)