SegTree fix for custom join #5
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Troquei de NEUTRO pra IDENTITY pra manter o padrão.
Trocar o default de T NEUTRO = 0; para T IDENTITY = T(); faz com que funcione naturalmente para tipos arbitrários pra seg Custom sem dar erro de compilação, com tanto que teu tipo arbitrário tenha um construtor simples (que normalmente já é o neutro mesmo). Fica bem mais fácil.
Além disso, pra Tipos compostos, quando tu faz inicialização com array, dá um bug bizarro se o assign da seg for com vazio, tem que dar assign de identidade pra funcionar.