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Bug fixes and improvements (#1348)
* Add "reference" for EN version. Bug fixes. * Unify the figure reference as "the figure below" and "the figure above". Bug fixes. * Format the EN markdown files. * Replace "" with <u></u> for EN version and bug fixes * Fix biary_tree_dfs.png * Fix biary_tree_dfs.png * Fix zh-hant/biary_tree_dfs.png * Fix heap_sort_step1.png * Sync zh and zh-hant versions. * Bug fixes * Fix EN figures * Bug fixes * Fix the figure labels for EN version
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@@ -37,7 +37,7 @@ This essential skill for elementary students, looking up a dictionary, is actual
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The above method of organizing playing cards is essentially the "Insertion Sort" algorithm, which is very efficient for small datasets. Many programming languages' sorting functions include the insertion sort.
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**Example 3: Making Change**. Suppose we buy goods worth $69$ yuan at a supermarket and give the cashier $100$ yuan, then the cashier needs to give us $31$ yuan in change. They would naturally complete the thought process as shown below.
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**Example 3: Making Change**. Suppose we buy goods worth $69$ yuan at a supermarket and give the cashier $100$ yuan, then the cashier needs to give us $31$ yuan in change. They would naturally complete the thought process as shown in the figure below.
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1. The options are currencies smaller than $31$, including $1$, $5$, $10$, and $20$.
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2. Take out the largest $20$ from the options, leaving $31 - 20 = 11$.
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