Compilare: user.cpp: In function ‘bool Hash_check(int)’: user.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Hash[entry].size(); ++i ) ~~^~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘void Do()’: user.cpp:61:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Val.size(); ++i ) ~~^~~~~~~~~~~~ user.cpp:73:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = start_c; i < Val.size(); ++i ) ~~^~~~~~~~~~~~ user.cpp:169:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( S >= Val[dr] && dr < Val.size() ) ~~~^~~~~~~~~~~~ user.cpp:175:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( dr == Val.size() ) ~~~^~~~~~~~~~~~~