自己想只能想到暴力法。 子数组求和的优化,使用前缀和(Prefix Sum)的方式也想不到。现在要好好记着了。核心是: res += presum[i + sz] - presum[i]; 第三种方法的左边有多少种选择,右边有多少种选择,要考虑0的情况。也要能判别奇偶数情况: class Solution {public int sumOddLengthSubarrays(int[] a
原题: A research laboratory of a world-leading automobile company has received an order to create a special transmission mechanism, which allows for incredibly efficient kickdown — an operation of swit
Gauss Fibonacci Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2584 Accepted Submission(s): 1078 Problem Description Without expecting, Angel