Editorial for Ký tự mới

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.

Submitting an official solution before solving the problem yourself is a bannable offence.

<button id="bt_1" type="button" onclick="{ document.getElementById('bt_1').style.visibility = 'hidden'; document.getElementById('bt_2').style.visibility = 'visible'; document.getElementById('bt_3').style.visibility = 'visible'; document.getElementById('div1').style.display='' document.getElementById('div2').style.display='none' document.getElementById('div3').style.display='none' }" style="visibility:"> Hint 1
<button id="bt_2" type="button" onclick="{ document.getElementById('bt_1').style.visibility = 'visible'; document.getElementById('bt_2').style.visibility = 'hidden'; document.getElementById('bt_3').style.visibility = 'visible'; document.getElementById('div1').style.display='none' document.getElementById('div2').style.display='' document.getElementById('div3').style.display='none' }" style="visibility:"> Approach 1
<button id="bt_3" type="button" onclick="{ document.getElementById('bt_1').style.visibility = 'visible'; document.getElementById('bt_2').style.visibility = 'visible'; document.getElementById('bt_3').style.visibility = 'hidden'; document.getElementById('div1').style.display='none' document.getElementById('div2').style.display='none' document.getElementById('div3').style.display='' }" style="visibility:"> Approach 2

<label>

Dùng bảng ASCII tìm điểm tương ứng
- Addition (+)
$new_c = c + 32$
- Bitwise (or)
$new_c = c\ |\ 32$

</label>


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