using namespace std; int t; int l,r; int main(){ cin>>t; while(t—){ cin>>l>>r; if((r/2+1)>=l){ cout<<((r-1)/2)< <endl; }else{="" cout<<r%l<<endl;="" }="" return="" 0;="" <="" re="">

//搜索时 for(int i=head[x];i;i=nxt[i]) int y=ver[x];