ans != MAX: ans 即为满足题意的所有染色方案中,花费最小的费用 DP 常见的三种优化方式见LeetCode 583 这题的思路。 本题可以采用滚动数组的方式进行优化,因为每一行的状态依赖上一行的所有状态,所以无法采用其他两种方式进行优化。 使用滚动数组的话,能将空间复杂度从O(m * target * n) 优化为 O(target *...
[LeetCode] 256. Paint House There is a row ofnhouses, where each house can be painted one of three colors: red, blue, or green. The cost of painting each house with a certain color is different. You have to paint all the houses such that no two adjacent houses have the same color....
[LeetCode] Paint House Problem Description: There are a row ofnhouses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house with a certain color is different. You have to paint all the houses such that no two adjacent houses have...
There are a row of houses, each house can be painted with three colors red, blue and green. The cost of painting each house with a certain color is different. You have to paint all the houses such that no two adjacent houses have the same color. You have to paint the houses with mi...
256. 265. Paint House https://leetcode.com/problems/paint-house/description/ image.png 因为有3种颜色,所以在建立DP的时候,需要维护3个状态,就是最后一个以什么颜色的HOSUE,最少要花多少。 dp[i][0] = min(dp[i-1 ][1],dp[i-1 ][2])+cost[i][0]转移方程就出来了。
paint i 和 ii一样,只是限定了k=3,所以可以写的简单一些。 paint ii https://leetcode.com/problems/paint-house-ii/ 未压缩空间: classSolution{public:intminCostII(vector<vector<int>>&costs){intn=costs.size();if(n==0)return0;intm=costs[0].size();vector<vector<int>>dp(n,vector<int>(...
[奇葩corner case]: 可以2个柱子颜色相同,则起点从2开始, 之前的所有情况,包括0 和 1 都要分别列出来写 [思维问题]: 列了几步以后觉得列不完,没思路:从小到大,反正只有相同、不相同两种情况,分情况讨论就行了 [一句话思路]: 第三根柱子开始有讨论余地,从此开始进行分类讨论。
Better Solution: 参考:https://leetcode.com/discuss/54415/ac-java-solution-without-extra-space Time Complexity: O(N*K), Space Complexity: O(1) The idea is similar to the problem Paint House I, for each house and each color, the minimum cost of painting the house with that color should...
这道题是Paint House的拓展,这题的解法的思路还是用DP,那道题只让用红绿蓝三种颜色来粉刷房子,而这道题让我们用k种颜色,这道题不能用之前那题的Math.min方法了,会TLE。只要把最小和次小的都记录下来就行了,用preMin和PreSec来记录之前房子的最小和第二小的花费的颜色,如果当前房子颜色和min1相同,那么我们...
265. Paint House II https://leetcode.com/problems/paint-house-ii/discuss/69492/AC-Java-solution-without-extra-space