golang, 104 bytes

Result

WA

Duration

1291ms

Code [DL]

package main
import."os"
func main(){b:=new([7]byte);for Stdin.Read(b){Stdout.Write(b[b[1]==b[2]*2+2])}}

stdin

388 184
894 992
781 588
291 115
783 327
934 143
733 339
457 992
866 869
498 486
755 266
935 778
878 994
455 881
833 367
236 638
812 638
982 594
754 955
773 738
825 291
265 662
716 132
655 791
946 318
855 564
572 273
933 334
937 774
972 727
432 257
522 335

stdout

stderr

# command-line-arguments
/tmp/code.go:3:43: cannot use b (type *[7]byte) as type []byte in argument to os.Stdin.Read
/tmp/code.go:3:43: multiple-value os.Stdin.Read() in single-value context
/tmp/code.go:3:61: non-integer array index b[1] == b[2] * 2 + 2
/tmp/code.go:3:61: cannot use b[b[1] == b[2] * 2 + 2] (type byte) as type []byte in argument to os.Stdout.Write
/root/script: line 7: /tmp/code: not found
rm: can't remove '/tmp/code': No such file or directory

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd7d00a1d0 /* 7 vars */) = 0
11    execve("/usr/bin/realpath", ["realpath", "/volume/CODE"], 0x55b73a846d18 /* 7 vars */) = 0
11    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=11, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    execve("/bin/ln", ["ln", "-sf", "/volume/CODE", "/tmp/code.go"], 0x55b73a846d38 /* 7 vars */) = 0
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    execve("/usr/bin/go", ["/usr/bin/go", "build", "-o", "/tmp/code", "/tmp/code.go"], 0x55b73b012028 /* 7 vars */) = 0
19    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0002b5ad0 /* 25 vars */) = 0
20    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0002ba680 /* 25 vars */) = 0
25    +++ exited with 0 +++
23    +++ exited with 0 +++
26    +++ exited with 0 +++
19    +++ exited with 0 +++
13    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=19, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
27    execve("/usr/lib/go/pkg/tool/linux_amd64/asm", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0002ba8f0 /* 25 vars */) = 0
30    +++ exited with 0 +++
29    +++ exited with 0 +++
28    +++ exited with 0 +++
20    +++ exited with 0 +++
22    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
31    execve("/usr/lib/go/pkg/tool/linux_amd64/asm", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0002bab60 /* 25 vars */) = 0
32    +++ exited with 0 +++
33    +++ exited with 0 +++
34    +++ exited with 0 +++
27    +++ exited with 0 +++
22    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=27, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
36    +++ exited with 0 +++
37    +++ exited with 0 +++
35    +++ exited with 0 +++
31    +++ exited with 0 +++
22    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=31, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
38    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-o", "/tmp/go-build476202759/b001/_pkg"..., "-trimpath", "/tmp/go-build476202759/b001=>", "-p", "main", "-complete", "-buildid", "bd6lHsOQqtUvD-P0xuoM/bd6lHsOQqtU"..., "-goversion", "go1.13.10", "-D", "_/tmp", "-importcfg", "/tmp/go-build476202759/b001/impo"..., "-pack", "-c=2", "/tmp/code.go"], 0xc0001444e0 /* 25 vars */) = 0
41    +++ exited with 2 +++
40    +++ exited with 2 +++
39    +++ exited with 2 +++
42    +++ exited with 2 +++
38    +++ exited with 2 +++
22    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=38, si_uid=0, si_status=2, si_utime=0, si_stime=0} ---
24    +++ exited with 2 +++
22    +++ exited with 2 +++
21    +++ exited with 2 +++
18    +++ exited with 2 +++
17    +++ exited with 2 +++
16    +++ exited with 2 +++
15    +++ exited with 2 +++
14    +++ exited with 2 +++
13    +++ exited with 2 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=2, si_utime=4, si_stime=8} ---
43    execve("/bin/cat", ["cat", "-"], 0x55b73a846d08 /* 7 vars */) = 0
44    execve("/tmp/code", ["/tmp/code"], 0x55b73a846cf0 /* 7 vars */) = -1 ENOENT (No such file or directory)
44    +++ exited with 127 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=44, si_uid=0, si_status=127, si_utime=0, si_stime=0} ---
43    --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=43, si_uid=0} ---
43    +++ killed by SIGPIPE +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=43, si_uid=0, si_status=SIGPIPE, si_utime=0, si_stime=0} ---
45    execve("/bin/rm", ["rm", "/tmp/code.go", "/tmp/code"], 0x55b73a846cf0 /* 7 vars */) = 0
45    +++ exited with 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=45, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
10    +++ exited with 1 +++