golang, 103 bytes

Result

WA

Duration

1134ms

Code [DL]

package main
import."os"
func main(){b:=new([7]byte);for Stdin.Read(b){Stdout.Write(b[b[1]/=b[2]?:4])}}

stdin

638 933
716 643
932 323
656 995
259 912
957 356
779 771
955 455
786 661
277 798
766 142
328 279
499 773
597 554
458 434
242 541
699 994
621 318
722 728
128 953
515 153
377 883
873 334
654 581
295 997
411 114
851 316
477 797
296 695
673 378
311 241
129 476

stdout

stderr

# command-line-arguments
/tmp/code.go:3:66: syntax error: unexpected /=, expecting :
/tmp/code.go:3:72: invalid character U+003F '?'
/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"], 0x7ffcb46ae570 /* 7 vars */) = 0
11    execve("/usr/bin/realpath", ["realpath", "/volume/CODE"], 0x560680bccd18 /* 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"], 0x560680bccd38 /* 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"], 0x560682b70028 /* 7 vars */) = 0
20    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0002eb450 /* 25 vars */) = 0
21    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0002e16c0 /* 25 vars */) = 0
24    +++ exited with 0 +++
27    +++ exited with 0 +++
26    +++ exited with 0 +++
25    +++ exited with 0 +++
21    +++ exited with 0 +++
14    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
31    +++ exited with 0 +++
29    +++ exited with 0 +++
30    +++ exited with 0 +++
28    +++ exited with 0 +++
20    +++ exited with 0 +++
19    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
32    execve("/usr/lib/go/pkg/tool/linux_amd64/asm", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0002eb6c0 /* 25 vars */) = 0
33    execve("/usr/lib/go/pkg/tool/linux_amd64/asm", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0002e1930 /* 25 vars */) = 0
37    +++ exited with 0 +++
35    +++ exited with 0 +++
36    +++ exited with 0 +++
34    +++ exited with 0 +++
32    +++ exited with 0 +++
16    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=32, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
38    +++ exited with 0 +++
40    +++ exited with 0 +++
39    +++ exited with 0 +++
33    +++ exited with 0 +++
18    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=33, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
41    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-o", "/tmp/go-build192696641/b001/_pkg"..., "-trimpath", "/tmp/go-build192696641/b001=>", "-p", "main", "-complete", "-buildid", "CF06lyavbZlxeLK8CY-d/CF06lyavbZl"..., "-goversion", "go1.13.10", "-D", "_/tmp", "-importcfg", "/tmp/go-build192696641/b001/impo"..., "-pack", "-c=2", "/tmp/code.go"], 0xc0001445b0 /* 25 vars */) = 0
43    +++ exited with 2 +++
44    +++ exited with 2 +++
45    +++ exited with 2 +++
42    +++ exited with 2 +++
41    +++ exited with 2 +++
18    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=41, si_uid=0, si_status=2, si_utime=0, si_stime=0} ---
23    +++ exited with 2 +++
22    +++ exited with 2 +++
19    +++ exited with 2 +++
14    +++ exited with 2 +++
17    +++ exited with 2 +++
15    +++ exited with 2 +++
16    +++ exited with 2 +++
18    +++ 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=3, si_stime=11} ---
46    execve("/bin/cat", ["cat", "-"], 0x560680bccd08 /* 7 vars */) = 0
47    execve("/tmp/code", ["/tmp/code"], 0x560680bcccf0 /* 7 vars */) = -1 ENOENT (No such file or directory)
47    +++ exited with 127 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=47, si_uid=0, si_status=127, si_utime=0, si_stime=0} ---
46    --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=46, si_uid=0} ---
46    +++ killed by SIGPIPE +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=46, si_uid=0, si_status=SIGPIPE, si_utime=0, si_stime=0} ---
48    execve("/bin/rm", ["rm", "/tmp/code.go", "/tmp/code"], 0x560680bcccf0 /* 7 vars */) = 0
48    +++ exited with 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=48, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
10    +++ exited with 1 +++