View Compilation Error

0_0_30088857_3847.c:3:1: error: expected identifier or '(' before '/' token
 //#include<bits/stdc++.h>
 ^
0_0_30088857_3847.c:3:3: error: stray '#' in program
 //#include<bits/stdc++.h>
   ^
0_0_30088857_3847.c:4:3: error: stray '#' in program
 //#include<unordered_map>
   ^
0_0_30088857_3847.c:5:3: error: stray '#' in program
 //#include<unordered_set>
   ^
0_0_30088857_3847.c:6:21: fatal error: functional: No such file or directory
 #include<functional>
                     ^
compilation terminated.