class Solution:
    def helper(self,l,r,clips)->int:
        maxL,maxR=0,0
        iL,iR=-1,-1
        for i,c in enumerate(clips):
            if c[0]<=l and c[1]>=r:
                return 1
            if c[0]<=l:
                if c[1]-l>maxL:
                    maxL=c[1]-l
                    iL=i
            if c[1]>=r:
                print(r,c[0],c[1],maxR)
                if r-c[0]>maxR:
                    maxR=r-c[0]
                    iR=i
        if iL==-1 or iR==-1:
            return -1
        
        new_l=clips[iL][1]
        new_r=clips[iR][0]
        if clips[iL][0]==clips[iR][0] and clips[iL][1]==clips[iR][1]:
            return 1
        if new_l>=new_r:
            return 2
        clips=[c for i,c in enumerate(clips) if i not in (iL,iR)]
        return 2+self.helper(new_l,new_r,clips)
        
    
    def videoStitching(self, clips: List[List[int]], T: int) -> int:
        return self.helper(0,T,clips)