unique_path_ii

  • 2022-12-14
  • 浏览 (462)

unique_path_ii.go 源码

package main

//不同路径II

func uniquePathsWithObstacles1(obstacleGrid [][]int) int {
	m, n := len(obstacleGrid), len(obstacleGrid[0])
	dp := make([][]int, m)
	for i := range dp {
		dp[i] = make([]int, n)
	}

	for i := 0; i < m && obstacleGrid[i][0] == 0; i++ {
		dp[i][0] = 1
	}
	for i := 0; i < n && obstacleGrid[0][i] == 0; i++ {
		dp[0][i] = 1
	}

	for i := 1; i < m; i++ {
		for j := 1; j < n; j++ {
			if obstacleGrid[i][j] == 0 {
				dp[i][j] = dp[i-1][j] + dp[i][j-1]
			}
		}
	}
	return dp[m-1][n-1]
}

//简化的写法
func uniquePathsWithObstacles2(obstacleGrid [][]int) int {
	m, n := len(obstacleGrid), len(obstacleGrid[0])
	dp := make([]int, n)
	dp[0] = 1
	for i := 0; i < m; i++ {
		for j := 0; j < n; j++ {
			if obstacleGrid[i][j] == 1 {
				dp[j] = 0
			} else if j > 0 {
				dp[j] += dp[j-1]
			}
		}
	}
	return dp[n-1]
}

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