Given a sequence of K integers { N1, N2, …, NK }. A continuous subsequence is defined to be { Ni, Ni+1, …,Nj } where 1 <= i <= j <= K. The Maximum Subsequence is the continuous subsequence which has thelargest sum of its elements. For example, gi…
Given a sequence of K integers { N1, N2, ..., *N**K* }. A continuous subsequence is defined to be { Ni, Ni+1, ..., *N**j* } where 1≤i≤j≤K. The Maximum Subsequence is the continuous subsequence which has the largest sum of its elements. For example, g…
传送门--Luogu 传送门--Codeforces 如果存在长度\(>3\)的等差子序列,那么一定存在长度\(=3\)的等差子序列,所以我们只需要找长度为\(3\)的等差子序列.可以枚举等差子序列的第二个元素\(b\),那么存在长度为\(3\)的等差子序列等价于:可以在\(b\)左边找到一个元素\(a\),在\(b\)右边找到一个元素\(c\),满足\(b - a = c - b\). 对于找到\(ac\)两个元素,一个比较直观的想法是:对\(b\)左边和右边的所有元素各建一个bitset\(…
Problem: Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. The update(i, val) function modifies nums by updating the element at index i to val. Example: Given nums = [1, 3, 5] sumRange(0, 2) -> 9 up…