LeetCode 64. Minimum Path Sum 解題報告
阿新 • • 發佈:2019-01-24
64. Minimum Path Sum
My Submissions Total Accepted: 63385 Total Submissions: 185663 Difficulty: MediumGiven a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path.
Note: You can only move either down or right at any point in time.
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我的AC程式碼
public class MinimumPathSum { public static void main(String[] args) { int[][] a = {{1,2},{1,1}}; System.out.print(minPathSum(a)); } public static int minPathSum(int[][] grid) { if (grid.length == 0 || grid[0].length == 0) return 0; // initiate int[][] dp = new int[grid.length][grid[0].length]; dp[0][0] = grid[0][0]; int rows = dp.length; int cols = dp[0].length; for (int i = 1; i < rows; i++) { dp[i][0] += (dp[i - 1][0] + grid[i][0]); } for (int i = 1; i < cols; i++) { dp[0][i] += (dp[0][i - 1] + grid[0][i]); } for (int i = 1; i < rows; i++) { for (int j = 1; j < dp[i].length; j++) { int min = Math.min(dp[i - 1][j], dp[i][j - 1]); dp[i][j] = grid[i][j] + min; } } return dp[rows -1][cols -1]; } }