unique_path_ii
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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