title: Sort a vector of pairs by first element then by second element of the pair in C++?
body: <p>If I have a <code>vector&lt;pair&lt;int,int&gt; &gt;</code> datatype, what is the accepted way to sort it by the first element of the pair and then by second if the firsts are equal? For instance maybe (1,10), (3,3), (7,13), (7,16), (8,1), (8,2), (15,2) etc.</p>