611和493的指针移动问题是完全一致的。
数组的两段[a,b], [b+1, c]，随着第一段指针的后移，第二段满足的元素逐个增多。
需要求 左指针指向第一段各个元素时，第二段满足性质的元素个数的总和。
模板就是：
j = b+1
cnt = 0
for i in range(a,b+1):

while j <= c and check(i, j):

j += 1

cnt += j - (b+1)

本质是维护A[b+1, j)使其总是满足性质

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