M,sum=0;cin>>L>>M;for(inti=0;i<=L;++i){tree[i]=1;}//把树的状态初始化为1;for(inti=0;i<M;++i){cin>>begin[i]>>end[i];}for(inti=0;i<M;++i){for(intj=begin[i];j<=end[i];++j){tree[j]=0;}}//把要移开的树置为0for(inti=0;i<=L;++i){if(tree[i]...