vlang, 82 bytes

Result

WA

Duration

2042ms

Code [DL]

import os
fn main(){for true {a:=os.get_line()
print(a[if a[1]==a[2]{2}else{4}])}}

stdin

255 254
877 477
355 557
399 992
723 339
642 291
575 752
382 928
425 267
188 669
977 231
379 722
113 115
484 188
537 887
544 467
938 126
294 449
195 598
858 767
944 479
599 869
621 319
164 465
672 475
168 667
266 785
149 937
863 258
838 389
288 669
654 117

stdout

57593279287711841457493446692381V panic: string index out of range: 1 / 0
backtrace_symbols_fd is missing, so printing backtraces is not available.

Some libc implementations like musl simply do not provide it.

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffe924ac700 /* 7 vars */) = 0
12    execve("/usr/bin/realpath", ["realpath", "/volume/CODE"], 0x56207b8edd18 /* 7 vars */) = 0
12    +++ exited with 0 +++
11    --- 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("/bin/cp", ["cp", "-f", "/volume/CODE", "/tmp/code.v"], 0x56207b8edd38 /* 7 vars */) = 0
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
14    execve("/bin/cat", ["cat", "-"], 0x56207b8edd58 /* 7 vars */) = 0
15    execve("/root/v", ["/root/v", "run", "/tmp/code.v"], 0x56207b8edd80 /* 7 vars */) = 0
14    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
16    execve("/bin/sh", ["sh", "-c", "cc  -std=gnu11 -Wall -Wextra -Wn"...], 0x55b8be728780 /* 8 vars */) = 0
16    execve("/usr/bin/cc", ["cc", "-std=gnu11", "-Wall", "-Wextra", "-Wno-unused-variable", "-Wno-unused-parameter", "-Wno-unused-result", "-Wno-unused-function", "-Wno-missing-braces", "-Wno-unused-label", "-Werror=implicit-function-declar"..., "-o", "/tmp/code", "/root/.cache/v/code.tmp.c", "-lm", "-lpthread", "-ldl"], 0x55ab2b4b0688 /* 8 vars */) = 0
17    execve("/usr/libexec/gcc/x86_64-alpine-linux-musl/9.3.0/cc1", ["/usr/libexec/gcc/x86_64-alpine-l"..., "-quiet", "/root/.cache/v/code.tmp.c", "-quiet", "-dumpbase", "code.tmp.c", "-mtune=generic", "-march=x86-64", "-auxbase", "code.tmp", "-Wall", "-Wextra", "-Wno-unused-variable", "-Wno-unused-parameter", "-Wno-unused-result", "-Wno-unused-function", "-Wno-missing-braces", "-Wno-unused-label", "-Werror=implicit-function-declar"..., "-std=gnu11", "-o", "/tmp/ccCNeiJA.s"], 0x1bc9c20 /* 11 vars */) = 0
17    +++ exited with 0 +++
16    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=17, si_uid=0, si_status=0, si_utime=70, si_stime=5} ---
18    execve("/usr/lib/gcc/x86_64-alpine-linux-musl/9.3.0/../../../../x86_64-alpine-linux-musl/bin/as", ["/usr/lib/gcc/x86_64-alpine-linux"..., "--64", "-o", "/tmp/ccelDeNc.o", "/tmp/ccCNeiJA.s"], 0x1bc9c20 /* 11 vars */) = 0
18    +++ exited with 0 +++
16    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=18, si_uid=0, si_status=0, si_utime=6, si_stime=1} ---
19    execve("/usr/libexec/gcc/x86_64-alpine-linux-musl/9.3.0/collect2", ["/usr/libexec/gcc/x86_64-alpine-l"..., "-plugin", "/usr/libexec/gcc/x86_64-alpine-l"..., "-plugin-opt=/usr/libexec/gcc/x86"..., "-plugin-opt=-fresolution=/tmp/cc"..., "-plugin-opt=-pass-through=-lgcc", "-plugin-opt=-pass-through=-lgcc_"..., "-plugin-opt=-pass-through=-lc", "-plugin-opt=-pass-through=-lgcc", "-plugin-opt=-pass-through=-lgcc_"..., "--eh-frame-hdr", "--hash-style=gnu", "-m", "elf_x86_64", "--as-needed", "-dynamic-linker", "/lib/ld-musl-x86_64.so.1", "-pie", "-z", "relro", "-z", "now", "-o", "/tmp/code", "/usr/lib/gcc/x86_64-alpine-linux"..., "/usr/lib/gcc/x86_64-alpine-linux"..., "/usr/lib/gcc/x86_64-alpine-linux"..., "-L/usr/lib/gcc/x86_64-alpine-lin"..., "-L/usr/lib/gcc/x86_64-alpine-lin"..., "-L/usr/lib/gcc/x86_64-alpine-lin"..., "-L/lib/../lib", "-L/usr/lib/../lib", ...], 0x1bc9c20 /* 13 vars */) = 0
20    execve("/usr/lib/gcc/x86_64-alpine-linux-musl/9.3.0/../../../../x86_64-alpine-linux-musl/bin/ld", ["/usr/lib/gcc/x86_64-alpine-linux"..., "-plugin", "/usr/libexec/gcc/x86_64-alpine-l"..., "-plugin-opt=/usr/libexec/gcc/x86"..., "-plugin-opt=-fresolution=/tmp/cc"..., "-plugin-opt=-pass-through=-lgcc", "-plugin-opt=-pass-through=-lgcc_"..., "-plugin-opt=-pass-through=-lc", "-plugin-opt=-pass-through=-lgcc", "-plugin-opt=-pass-through=-lgcc_"..., "--eh-frame-hdr", "--hash-style=gnu", "-m", "elf_x86_64", "--as-needed", "-dynamic-linker", "/lib/ld-musl-x86_64.so.1", "-pie", "-z", "relro", "-z", "now", "-o", "/tmp/code", "/usr/lib/gcc/x86_64-alpine-linux"..., "/usr/lib/gcc/x86_64-alpine-linux"..., "/usr/lib/gcc/x86_64-alpine-linux"..., "-L/usr/lib/gcc/x86_64-alpine-lin"..., "-L/usr/lib/gcc/x86_64-alpine-lin"..., "-L/usr/lib/gcc/x86_64-alpine-lin"..., "-L/lib/../lib", "-L/usr/lib/../lib", ...], 0x7ffe82fc32c0 /* 13 vars */) = 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=1} ---
19    +++ exited with 0 +++
16    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=19, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
16    +++ exited with 0 +++
15    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=16, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
21    execve("/bin/sh", ["sh", "-c", "\"/tmp/code\""], 0x55b8be728780 /* 8 vars */) = 0
21    execve("/tmp/code", ["/tmp/code"], 0x560fb02d9c60 /* 8 vars */) = 0
21    +++ exited with 1 +++
15    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
15    +++ exited with 1 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=15, si_uid=0, si_status=1, si_utime=6, si_stime=7} ---
11    +++ exited with 1 +++