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Design_A_Text_Editor.cpp
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Design_A_Text_Editor.cpp
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class TextEditor {
public:
std::list<char> v;
std::list<char>::iterator itr;
TextEditor() {
v.clear();
v.insert(v.begin(), '#');
itr = v.end();
}
void showme()
{
for (auto &i : v)
cout << i;
cout << endl;
}
void addText(string text) {
for (auto &i : text)
v.insert(itr, i);
}
int deleteText(int k) {
int res = 0;
while (k-- and itr != v.begin())
itr--, res++;
if (itr == v.begin())
itr++, res--;
k = res;
while (res-- and itr != v.end())
itr = v.erase(itr);
return k;
}
string cursorLeft(int k) {
while (k-- and itr != v.begin())
itr--;
if (itr == v.begin())
{
itr++;
return "";
}
auto it = itr;
k = 10;
string ans = "";
while (it != v.begin() and k--)
{
it--;
ans += *it;
}
if (it == v.begin())
{
ans.pop_back();
it++;
}
reverse(ans.begin(), ans.end());
return ans;
}
string cursorRight(int k) {
while (k-- and itr != v.end())
itr++;
auto it = itr;
k = 10;
string ans = "";
while (it != v.begin() and k--)
{
it--;
ans += *it;
}
if (it == v.begin())
{
ans.pop_back();
it++;
}
reverse(ans.begin(), ans.end());
return ans;
}
};
/**
* Your TextEditor object will be instantiated and called as such:
* TextEditor* obj = new TextEditor();
* obj->addText(text);
* int param_2 = obj->deleteText(k);
* string param_3 = obj->cursorLeft(k);
* string param_4 = obj->cursorRight(k);
*/