Numbers and symbols are on the layer above my base layer. Navigation keys, like arrow keys and mouse keys, are on the next layer up. I've made the arrow keys more powerful with tap dance. Tap for left arrow, hold for Ctrl + Left to go back a whole word, tap and hold for Home to go to the beginning of the line, for example.
* @param mid 中间位置（左子数组结束位置）
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Input formatting choices (reversed digits, delimiters, etc.) as long as the format is fixed and doesn't encode the answer
He draws parallels to chlorofluorocarbons pollutants released from refrigerators that bore a hole in the ozone layer last century, and were eventually banned.