题解/算法{C.GooseGooseDuck}@LINK:https://codeforces.com/gym/105184;令A[N]表示这N个人的区间;比如答案是[a,b,c,d]那么他一定满足:A[a].lef<=0<=A[a].rig,A[b].lef<=1<=A[b].rig,A[c].lef<=2<=A[c].rig,…贪心;对于最开头的人来说,令集合S: