C++ tests

Properly sort the pair list when there are duplicated i-j pairs #164

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Run time

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Job	Run time
ubuntu-20.04 / GCC - Valgrind	3m 40s
ubuntu-20.04 / Clang	56s
ubuntu-20.04 / GCC	1m 12s
macos-14 / Clang	41s
windows-2019 / MSVC	1m 32s
windows-2019 / MinGW	1m 25s
	9m 26s