An example for a function that is defined in $[0,1]\rightarrow \mathbb{R}$ and is integrable but is not monotone and not continuous in $[0,1]$

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Basically I have been trying this question for a while but having the function defined as non - monotone and non continuous always messes up my examples.

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You can take$$\begin{array}{ccc}[0,1]&\longrightarrow&\mathbb R\\t&\mapsto&\begin{cases}0&\text{ if }t\neq\frac12\\1&\text{ otherwise.}\end{cases}\end{array}$$