Compilare: main.cpp: In function 'int main()': main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= query.size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp:33:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i != 0 && (i == query.size() || get<0>(query[i]) != get<0>(query[i - 1]))) ~~^~~~~~~~~~~~~~~ main.cpp:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == query.size()) ~~^~~~~~~~~~~~~~~