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class RangeModule { class SegNode { int left, right, mid; SegNode lc, rc; boolean modified; boolean covered; boolean empty; public SegNode(int left, int right){ this.left=left; this.right=right; this.mid=left+(right-left)/2; this.empty=true; } void addRange(int left, int right){ if (left<=this.left&&right>=this.right){ if (!covered) { covered = true; modified=true; empty=false; } } else { pushdown(); if (left<=mid) this.lc.addRange(left, right); if (right>mid)this.rc.addRange(left, right); maintain(); } } void maintain(){ this.covered=this.lc.covered&&this.rc.covered; this.empty=this.lc.empty&&this.rc.empty; } void removeRange(int left, int right){ if (left<=this.left&&right>=this.right){ if (!empty){ empty=true; covered=false; modified=true; } } else { pushdown(); if (left<=mid)this.lc.removeRange(left, right); if (right>mid)this.rc.removeRange(left, right); maintain(); } } boolean query(int left, int right){ if (this.empty)return false; if (this.covered)return true; if (left<=this.left&&right>=this.right) { return this.covered; } boolean ans=true; if (left<=mid)ans&=this.lc.query(left, right); if (right>mid)ans&=this.rc.query(left, right); return ans; } void pushdown(){ if (this.lc==null){ this.lc=new SegNode(left, mid); this.lc.covered=this.covered; this.lc.empty=this.empty; this.rc=new SegNode(mid+1,right); this.rc.covered=this.covered; this.rc.empty=this.empty; this.modified=false; } else if (modified){ this.lc.covered=this.covered; this.lc.empty=this.empty; this.lc.modified=true; this.rc.covered=this.covered; this.rc.empty=this.empty; this.rc.modified=true; this.modified=false; } } } SegNode root; public RangeModule() { root =new SegNode(1, 1_000_000_000); } public void addRange(int left, int right) { root.addRange(left, right-1); } public boolean queryRange(int left, int right) { return root.query(left, right-1); } public void removeRange(int left, int right) { root.removeRange(left, right-1); } }
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