Compilare: In file included from /usr/include/c++/6/cassert:44:0, from main.cpp:3: main.cpp: In member function 'int PersistentTrie::query(int, int, int)': main.cpp:111:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(j - 1 < rootsLeft.size()); ~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:118:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(i - 1 < rootsRight.size()); ~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:125:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(i < rootsLeft.size()); ~~^~~~~~~~~~~~~~~~~~ main.cpp:126:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(removedLeft < rootsLeft.size()); ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:127:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(removedRight < rootsRight.size()); ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:106:13: warning: unused variable 'howManyRight' [-Wunused-variable] int howManyRight = nrRight - removedRight; ^~~~~~~~~~~~