25992 questions

### A is an array with N elements which suffers M operations: 0 a b- find the maximum value in [a,b] and 1 a b- the element on the position a becomes b. Answer each question '0' in the most efficient way.

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Answered by Victor, who tutored Computing A Level with MyTutor

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### Given a graph with n nodes and m edges, every edge has a passing cost that can be negative, find the minimum distance between node 1 and every other node

We will use the Bellman-Ford algorithm to compute the minimum distance between that start node and every other one, by passing through each edge for a maximum of n times and "relaxing the edge", where possible, to obtain the best path. Also, we will improve the algorithm by using only the nodes that helped us relax a path in the past, the other ones being redundant. This will be done by using a queue and the final algorithm will have an O(n*m) complexity but is much faster in practice.
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Answered by Victor, who tutored Computing A Level with MyTutor

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### Test

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Answered by Nick, Maths A Level tutor with MyTutor

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### Outline Asch’s findings in relation to two variables affecting conformity. Briefly explain two limitations of Asch’s conformity research. [8 marks]

Read over what the question is asking you carefully and look at a number of marks the question is worth. This question is worth 8 marks. You can get 4 marks from the first part of the question ‘Outline Asch’s findings in relation to two variables affect conformity’, and the last 4 marks from the second half ‘Briefly explain two limitations of Asch’s conformity research’. In order to get full marks for part one, you need to not only show your knowledge about two variables found that can affect conformity, but also detail what Asch found out about those variables. It is not enough to only mention the variable. For example, if you were to mention group size as a variable that affects conformity, you would also need to point out that Asch found that group size acted as a variable to a point – conformity levels increased but only up to a group majority of 3 confederates, any larger and conformity levels plateaued or did not significantly increase. Remember, pick out two variables affecting conformity and what Asch found out about each variable. By doing this, you will get the first 4 marks. For the second part of this question, you need to show you understand two limitations of Asch’s study. You can get one mark from stating the limitation, and another mark for giving an explanation of the limitation. You’ll need to do this twice in order to get the full 4 marks for this section. For example, you could mention that one limitation of the study is that it was made up of males and has a gender bias, thus not representative of female behaviour. You could also pick out that the study is not representative of a larger population as the sample was that of young male college students, thus the behaviour of people from other educational backgrounds, ages, and gender are not taken into account in the final result. Finally, remember to use specific terminology where appropriate in order to get full marks, i.e. ‘sample’, ‘variables’, ‘confederates’, etc.
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Answered by Scott, who tutored Psychology A Level with MyTutor

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### How do you conjugate the 'passé composé' ?

The passé composé goes hand in hand with the présent de l'indicatif. It is formed by putting an auxiliary verb, être or avoir and a past participle together. The passé composé is used to describe an action that has occured in the past and that is done. Example: Hier j'ai chanté. Je suis sorti(e). In both of these examples, an auxiliary verb and a past participle have been put together. For the passé composé the auxiliary verb has to be conjugated at the present tense (j'ai-tu as-il/elle/on a-nous avons-vous avez...) In terms of past particples, some verbs follow relatively simple rules. For -er verbs, past participles end in -é, for -ir verbs they end in -i. Example: Chanter = chanté Dormir = dormi
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Answered by Camille, French GCSE tutor with MyTutor

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### To what extent do you agree with the view that the novel is a total condemnation of transgression? (Frankenstein by Mary Shelly)

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Answered by Scott, who tutored English Literature A Level with MyTutor

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### How do you simplify something of the form Acos(x) + Bsin(x) ?

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Answered by Jack, Maths A Level tutor with MyTutor

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### Comment on how Handel uses the following elements in And the glory of the Lord: Melody, Harmony & tonality, Dynamics, Texture, Mood

In typical Baroque fashion, Handel creates a decoratve melody by using trills and grace notes. He also uses devices effectively to create an interesting melody. For example he employs melismatic writing, which means he uses more than one note per syllable- for example the long drawn-out phrases on the second syllable of 'revealed.' The arcing melody on this syllable also functions as a recurring motif which is satisfying for the listener as it creates a sense of familiarity, as we hear a similar tune applied to different words in later phrases. The tonality is major throughout the movement, creating a joyous feel, appropriate for the thanksgiving sentiment. Any modulaions in the piece are to the dominant key, stabilising the tonality in the tonic A major key throughout. As expected the movement features many perfect cadences, but curiously it ends with a plagal one. This gives particularly resounding sense of finality, as 'Amens' often use this cadence. The diatonic harmony, free of chromaticism, also suits the thanksgiving nature of the movement.  Terraced dynamics are used throughout the movement, with sudden changes in dynamics to create contrast. This is common in Baroque music. The piece starts of quietly with a orchestral introduction and ends with a dramatic rest and then a loud cadence. There are several examples of canonic imitation in the movement, as phrases are passed around and different time and pitch intervals. However this polyphonic activity is balanced with homophonic moments, to create emphatic phrases of praise- the final phrase is a good example of this, with the final three words of the phrase, 'The mouth of the Lord hath spoken it'. This homophony adds to sense of finality the plagal cadence gives us.
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Answered by William, Music GCSE tutor with MyTutor

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