Compilare: user.cpp: In function ‘bool find(int)’: user.cpp:47:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1; i <= HT2[key2][0]; ++i ) ^ user.cpp:49:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( HT2[key2][i] == value ) ^ user.cpp:55:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1; i <= HT1[key1][0]; ++i ) ^ user.cpp:57:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( HT1[key1][i] == value ) ^ user.cpp: In function ‘void erase(int)’: user.cpp:82:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1; i <= HT1[key1][0]; ++i ) ^ user.cpp:84:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( HT1[key1][i] == value ) ^ user.cpp:86:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = i + 1; j <= HT1[key1][0]; ++j ) ^ user.cpp:96:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1; i <= HT2[key2][0]; ++i ) ^ user.cpp:98:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( HT2[key2][i] == value ) ^ user.cpp:100:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = i + 1; j <= HT2[key2][0]; ++j ) ^