Solution.go

type TextEditor struct {
	left, right []byte
}

func Constructor() TextEditor {
	return TextEditor{}
}

func (this *TextEditor) AddText(text string) {
	this.left = append(this.left, text...)
}

func (this *TextEditor) DeleteText(k int) int {
	k = min(k, len(this.left))
	if k < len(this.left) {
		this.left = this.left[:len(this.left)-k]
	} else {
		this.left = []byte{}
	}
	return k
}

func (this *TextEditor) CursorLeft(k int) string {
	k = min(k, len(this.left))
	for ; k > 0; k-- {
		this.right = append(this.right, this.left[len(this.left)-1])
		this.left = this.left[:len(this.left)-1]
	}
	return string(this.left[max(len(this.left)-10, 0):])
}

func (this *TextEditor) CursorRight(k int) string {
	k = min(k, len(this.right))
	for ; k > 0; k-- {
		this.left = append(this.left, this.right[len(this.right)-1])
		this.right = this.right[:len(this.right)-1]
	}
	return string(this.left[max(len(this.left)-10, 0):])
}

func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

/**
 * Your TextEditor object will be instantiated and called as such:
 * obj := Constructor();
 * obj.AddText(text);
 * param_2 := obj.DeleteText(k);
 * param_3 := obj.CursorLeft(k);
 * param_4 := obj.CursorRight(k);
 */