C++20 O2，奇怪的CE：测评记录。

源代码(不知道能不能AC)

本地预处理后的源代码(g++ std=c++20 -Wall -O2 -E)。

本地可编译，无警告(g++ -std=c++20 -Wall -O2)

本地GCC信息：(g++ -v)

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=C:/Program\ Files\ (x86)/MinGW64/bin/../libexec/gcc/x86_64-w
64-mingw32/13.2.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../../../src/gcc-13.2.0/configure --host=x86_64-w64-mingw32 --b
uild=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --prefix=/mingw64 --with-sys
root=/c/buildroot/x86_64-1320-posix-seh-ucrt-rt_v11-rev0/mingw64 --enable-host-s
hared --disable-multilib --enable-languages=c,c++,fortran,lto --enable-libstdcxx
-time=yes --enable-threads=posix --enable-libgomp --enable-libatomic --enable-lt
o --enable-graphite --enable-checking=release --enable-fully-dynamic-string --en
able-version-specific-runtime-libs --enable-libstdcxx-filesystem-ts=yes --disabl
e-libssp --disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap --
disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-
symvers --with-gnu-as --with-gnu-ld --with-arch=nocona --with-tune=core2 --with-
libiconv --with-system-zlib --with-gmp=/c/buildroot/prerequisites/x86_64-w64-min
gw32-static --with-mpfr=/c/buildroot/prerequisites/x86_64-w64-mingw32-static --w
ith-mpc=/c/buildroot/prerequisites/x86_64-w64-mingw32-static --with-isl=/c/build
root/prerequisites/x86_64-w64-mingw32-static --with-pkgversion='x86_64-posix-seh
-rev0, Built by MinGW-Builds project' --with-bugurl=https://github.com/niXman/mi
ngw-builds CFLAGS='-O2 -pipe -fno-ident -I/c/buildroot/x86_64-1320-posix-seh-ucr
t-rt_v11-rev0/mingw64/opt/include -I/c/buildroot/prerequisites/x86_64-zlib-stati
c/include -I/c/buildroot/prerequisites/x86_64-w64-mingw32-static/include' CXXFLA
GS='-O2 -pipe -fno-ident -I/c/buildroot/x86_64-1320-posix-seh-ucrt-rt_v11-rev0/m
ingw64/opt/include -I/c/buildroot/prerequisites/x86_64-zlib-static/include -I/c/
buildroot/prerequisites/x86_64-w64-mingw32-static/include' CPPFLAGS=' -I/c/build
root/x86_64-1320-posix-seh-ucrt-rt_v11-rev0/mingw64/opt/include -I/c/buildroot/p
rerequisites/x86_64-zlib-static/include -I/c/buildroot/prerequisites/x86_64-w64-
mingw32-static/include' LDFLAGS='-pipe -fno-ident -L/c/buildroot/x86_64-1320-pos
ix-seh-ucrt-rt_v11-rev0/mingw64/opt/lib -L/c/buildroot/prerequisites/x86_64-zlib
-static/lib -L/c/buildroot/prerequisites/x86_64-w64-mingw32-static/lib ' LD_FOR_
TARGET=/c/buildroot/x86_64-1320-posix-seh-ucrt-rt_v11-rev0/mingw64/bin/ld.exe --
with-boot-ldflags=' -Wl,--disable-dynamicbase -static-libstdc++ -static-libgcc'
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.2.0 (x86_64-posix-seh-rev0, Built by MinGW-Builds project)

求问此代码怎么洛谷GCC了？（写template的时候总出些奇奇怪怪的CE）