Error(s):

*** Error in `/var/www/service/usercode/811261262/a.out': free(): invalid pointer: 0x00000000022a3c40 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f084d8e17e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x7fe0a)[0x7f084d8e9e0a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f084d8ed98c]
/var/www/service/usercode/811261262/a.out[0x400770]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f084d88a830]
/var/www/service/usercode/811261262/a.out[0x400639]
======= Memory map: ========
00400000-00401000 r-xp 00000000 b6:4f3a1 2414236                         /var/www/service/usercode/811261262/a.out
00600000-00601000 r--p 00000000 b6:4f3a1 2414236                         /var/www/service/usercode/811261262/a.out
00601000-00602000 rw-p 00001000 b6:4f3a1 2414236                         /var/www/service/usercode/811261262/a.out
02292000-022c4000 rw-p 00000000 00:00 0                                  [heap]
7f0848000000-7f0848021000 rw-p 00000000 00:00 0 
7f0848021000-7f084c000000 ---p 00000000 00:00 0 
7f084d34b000-7f084d361000 r-xp 00000000 b6:4f3a1 105                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f084d361000-7f084d560000 ---p 00016000 b6:4f3a1 105                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f084d560000-7f084d561000 rw-p 00015000 b6:4f3a1 105                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f084d561000-7f084d669000 r-xp 00000000 b6:4f3a1 10854                   /lib/x86_64-linux-gnu/libm-2.23.so
7f084d669000-7f084d868000 ---p 00108000 b6:4f3a1 10854                   /lib/x86_64-linux-gnu/libm-2.23.so
7f084d868000-7f084d869000 r--p 00107000 b6:4f3a1 10854                   /lib/x86_64-linux-gnu/libm-2.23.so
7f084d869000-7f084d86a000 rw-p 00108000 b6:4f3a1 10854                   /lib/x86_64-linux-gnu/libm-2.23.so
7f084d86a000-7f084da29000 r-xp 00000000 b6:4f3a1 10849                   /lib/x86_64-linux-gnu/libc-2.23.so
7f084da29000-7f084dc29000 ---p 001bf000 b6:4f3a1 10849                   /lib/x86_64-linux-gnu/libc-2.23.so
7f084dc29000-7f084dc2d000 r--p 001bf000 b6:4f3a1 10849                   /lib/x86_64-linux-gnu/libc-2.23.so
7f084dc2d000-7f084dc2f000 rw-p 001c3000 b6:4f3a1 10849                   /lib/x86_64-linux-gnu/libc-2.23.so
7f084dc2f000-7f084dc33000 rw-p 00000000 00:00 0 
7f084dc33000-7f084dc4b000 r-xp 00000000 b6:4f3a1 10855                   /lib/x86_64-linux-gnu/libpthread-2.23.so
7f084dc4b000-7f084de4a000 ---p 00018000 b6:4f3a1 10855                   /lib/x86_64-linux-gnu/libpthread-2.23.so
7f084de4a000-7f084de4b000 r--p 00017000 b6:4f3a1 10855                   /lib/x86_64-linux-gnu/libpthread-2.23.so
7f084de4b000-7f084de4c000 rw-p 00018000 b6:4f3a1 10855                   /lib/x86_64-linux-gnu/libpthread-2.23.so
7f084de4c000-7f084de50000 rw-p 00000000 00:00 0 
7f084de50000-7f084dfc2000 r-xp 00000000 b6:4f3a1 3213                    /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f084dfc2000-7f084e1c2000 ---p 00172000 b6:4f3a1 3213                    /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f084e1c2000-7f084e1cc000 r--p 00172000 b6:4f3a1 3213                    /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f084e1cc000-7f084e1ce000 rw-p 0017c000 b6:4f3a1 3213                    /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f084e1ce000-7f084e1d2000 rw-p 00000000 00:00 0 
7f084e1d2000-7f084e1f8000 r-xp 00000000 b6:4f3a1 10838                   /lib/x86_64-linux-gnu/ld-2.23.so
7f084e3c3000-7f084e3c9000 rw-p 00000000 00:00 0 
7f084e3f4000-7f084e3f7000 rw-p 00000000 00:00 0 
7f084e3f7000-7f084e3f8000 r--p 00025000 b6:4f3a1 10838                   /lib/x86_64-linux-gnu/ld-2.23.so
7f084e3f8000-7f084e3f9000 rw-p 00026000 b6:4f3a1 10838                   /lib/x86_64-linux-gnu/ld-2.23.so
7f084e3f9000-7f084e3fa000 rw-p 00000000 00:00 0 
7ffc9db29000-7ffc9db3e000 rw-p 00000000 00:00 0                          [stack]
7ffc9db6a000-7ffc9db6c000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]

Abort signal from abort(3) (SIGABRT)