Compilare: main.cpp: In function 'int main()': main.cpp:45:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < arr.size(); i++ ){ ~~^~~~~~~~~~~~ main.cpp:50:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( q.size() <= M && cnt != 0 ){ ~~~~~~~~~^~~~ main.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( q.size() <= M ) ~~~~~~~~~^~~~