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前言

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一、力扣62. 不同路径

class Solution {public int uniquePaths(int m, int n) {int[][] dp = new int[m][n];for(int i = 0; i < n; i ++){dp[0][i] = 1;}for(int i = 0; i < m; i ++){dp[i][0] = 1;}for(int i = 1; i < m; i ++){for(int j = 1; j < n; j ++){dp[i][j] = dp[i-1][j] + dp[i][j-1];}}return dp[m-1][n-1];}
}

二、力扣63. 不同路径 II

class Solution {public int uniquePathsWithObstacles(int[][] obstacleGrid) {int row = obstacleGrid.length, col = obstacleGrid[0].length;int[][] dp = new int[row][col];for(int i = 0; i < col && obstacleGrid[0][i] != 1; i ++){dp[0][i] = 1;}for(int i = 0; i < row && obstacleGrid[i][0] != 1; i ++){dp[i][0] = 1;}for(int i = 1; i < row; i ++){for(int j = 1; j < col; j ++){if(obstacleGrid[i][j] == 1){dp[i][j] = 0;}else{dp[i][j] = dp[i-1][j] + dp[i][j-1];}}}return dp[row-1][col-1];}
}