435 无重叠区间

class Solution:
    def eraseOverlapIntervals(self, intervals: List[List[int]]) -> int:
        if not intervals:
            return 0
        intervals.sort(key=lambda x:x[1])
        n=len(intervals)
        r=intervals[0][1]
        ret=1
        for i in range(1,n):
            if intervals[i][0]>=r:
                ret+=1
                r=intervals[i][1]
        return n-ret

763 划分字母区间

class Solution:
    def partitionLabels(self, s: str) -> List[int]:
        last =[0]*26
        for i ,ch in enumerate(s):
            last[ord(ch)-ord('a')]=i
        p=[]
        st=0
        ed=0
        for i,ch in enumerate(s):
            ed=max(ed,last[ord(ch)-ord('a')])
            if i == ed:
                p.append(ed-st+1)
                st=ed+1
        return p

56