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I want to know how to sort the triple below based on the first column using C++?
Can I use std::map?
0 0 1
1 2 0
2 0 3
0 1 4
the wanted result is
0 0 1
0 1 4
1 2 0
2 0 3
You could just use std::sort on, for example, a vector of std::tuple – the default comparison is lexicographic, so first column counts most.