记得比较A,B并交换，还有不要像我一样还没读入玩ABC就getline吞换行

附上GG代码

int main(){
	cin >>l>>T>>o;
	getline (cin,kong);
	treebuild(root);
	while (o--){
		scanf ("%c%d%d",&op,&A,&B);
		getline (cin,kong);
		if (op=='C'){
			scanf ("%d",&C);
			treechange (root,A,B,C);
		}else {
			printf ("%d\n",popcount(treequery(root,A,B)));
		}
	}
	return 0;
}