leetcode-561-Array Partition I 题目描述: Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which makes sum of min(ai, bi) for all i from 1 to n as large as possible. Example 1: Input: ...
For example, if we have pairs(1,5),(2,3), and(4,4), the maximum pair sum would bemax(1+5, 2+3, 4+4) = max(6, 5, 8) = 8. Given an arraynumsof even lengthn, pair up the elements ofnumsinton / 2pairs such that: Each element ofnumsis in exactly one pair, and The ...
另外,刚开始看题的时候理解错了,以为是pair了之后,求所有sum((ai,bi))的最小值的最大值。这个变体虽然思路也很容易想到,就是贪心地最小匹配最大,然后遍历求最小。证明的时候又卡了一下,简单说下思路,假设按照贪心的思想组好的pair,然后(ai, bi)是最小的那个,如果有新方式将ai匹配到bi',那么只有三种情况...
public: int arrayPairSum(vector<int>& nums) { sort(nums.begin(), nums.end()); int sum = 0; for (int i = 0; i < nums.size(); i++) { if (i % 2 == 0) sum += nums[i]; } return sum; } }; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16...
leetcode561: Array Partition I 要求: Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which makes sum of min(ai, bi) for all i from 1 to n as large as possible. Example 1: Input: [...
截止至今LeetCode题目总量已经有1582题,估计将来每年平均增长300题左右,大部分人肯定是刷不完的,所以得有选择地刷LeetCode。
LeetCode 565——Array Nesting A zero-indexed array A of length N contains all integers from 0 to N-1. Find and return the longest length of set S, where S[i] = {A[i], A[A[i]], A[A[A[i]]], ... } subjected to the rule below. Suppose......
class Solution { public: int arrayPairSum(vector<int>& nums) { int result = 0; multiset<int> temp; for (int i = 0; i < nums.size(); i++) { temp.insert(nums[i]); } for (multiset<int>::iterator it = temp.begin(); it != temp.end(); ) { result += (*it); it++; ...
for(int i=0; i<nums.size(); i+=2) { sum += nums[i]; } return sum; } }; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. re 1. Leetcode_easy_561. Array Partition I; 2. Grandyang; end...
花花酱 LeetCode 2815. Max Pair Sum in an Array By zxi on August 13, 2023 You are given a 0-indexed integer array nums. You have to find the maximum sum of a pair of numbers from nums such that the maximum digit in both numbers are equal.Return the maximum sum or -1 if no su...