Leetcode: Candy
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There are N children standing in a line. Each child is assigned a rating value.
You are giving candies to these children subjected to the following requirements:
- Each child must have at least one candy.
- Children with a higher rating get more candies than their neighbors.
What is the minimum candies you must give?
从左到右扫描一遍,再从右到左扫描一遍。Tricky的地方是相等的rating可以分到的糖果不一样多。
class Solution {public: int candy(vector<int> &ratings) { int size = ratings.size(); vector<int> candies(size, 1); // Scan from left to right for (int i = 1; i < size; ++i) { if (ratings[i] > ratings[i-1]) { candies[i] = candies[i-1] + 1; } } // Scan from right to left int result = candies[size - 1]; for (int i = size - 2; i >= 0; --i) { if (ratings[i] > ratings[i+1]) { candies[i] = max(candies[i], candies[i+1] + 1); } result += candies[i]; } return result; }};
=====================第二次====================
class Solution {public: int candy(vector<int> &ratings) { vector<int> candies(ratings.size(), 1); for (int i = 1; i < ratings.size(); ++i) { if (ratings[i] > ratings[i-1]) { candies[i] = candies[i-1] + 1; } } for (int i = ratings.size() - 2; i >= 0; --i) { if (ratings[i] > ratings[i+1]) { candies[i] = max(candies[i], candies[i+1] + 1); } } int result = 0; for (int i = 0; i < candies.size(); ++i) { result += candies[i]; } return result; }};
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