Compilare: user.cpp: In function ‘int main()’: user.cpp:64:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( q[i][k] == q[j][k] && k < strlen(q[i]) && k < strlen(q[j]) ) ^ user.cpp:64:78: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( q[i][k] == q[j][k] && k < strlen(q[i]) && k < strlen(q[j]) ) ^ user.cpp:66:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( k == strlen(q[i]) ) ^