View Compilation Error

0_0_35884188_25469.c:1:1: error: expected identifier or '(' before '/' token
 //#pragma GCC optimize("Ofast")
 ^
0_0_35884188_25469.c:1:3: error: stray '#' in program
 //#pragma GCC optimize("Ofast")
   ^
0_0_35884188_25469.c:2:3: error: stray '#' in program
 //#pragma GCC target("avx,avx2,fma")
   ^
0_0_35884188_25469.c:3:3: error: stray '#' in program
 //#pragma GCC optimization ("unroll-loops")
   ^
0_0_35884188_25469.c:5:25: fatal error: bits/stdc++.h: No such file or directory
 #include <bits/stdc++.h>
                         ^
compilation terminated.