Merge pull request #2416 from fwqaaq/patch-6

Update 0417.太平洋大西洋水流问题.md

Author: youngyangyang04

problems/0417.太平洋大西洋水流问题.md

@@ -562,7 +562,213 @@ function pacificAtlantic(heights) {
 }
 ```
 
+### go
+
+dfs:
+
+```go
+var DIRECTIONS = [4][2]int{{-1, 0}, {1, 0}, {0, -1}, {0, 1}}
+
+func pacificAtlantic(heights [][]int) [][]int {
+	res := make([][]int, 0)
+	pacific := make([][]bool, len(heights))
+	atlantic := make([][]bool, len(heights))
+	for i := 0; i < len(heights); i++ {
+		pacific[i] = make([]bool, len(heights[0]))
+		atlantic[i] = make([]bool, len(heights[0]))
+	}
+	// 列
+	for i := 0; i < len(heights); i++ {
+		dfs(heights, pacific, i, 0)
+		dfs(heights, atlantic, i, len(heights[0])-1)
+	}
+	// 行
+	for j := 0; j < len(heights[0]); j++ {
+		dfs(heights, pacific, 0, j)
+		dfs(heights, atlantic, len(heights)-1, j)
+	}
+
+	for i := 0; i < len(heights); i++ {
+		for j := 0; j < len(heights[0]); j++ {
+			if pacific[i][j] && atlantic[i][j] {
+				res = append(res, []int{i, j})
+			}
+		}
+	}
+
+	return res
+}
+
+func dfs(heights [][]int, visited [][]bool, i, j int) {
+	visited[i][j] = true
+	for _, d := range DIRECTIONS {
+		x, y := i+d[0], j+d[1]
+		if x < 0 || x >= len(heights) || y < 0 || y >= len(heights[0]) || heights[i][j] > heights[x][y] || visited[x][y] {
+			continue
+		}
+
+		dfs(heights, visited, x, y)
+	}
+}
+```
+
+bfs:
+
+```go
+var DIRECTIONS = [4][2]int{{-1, 0}, {1, 0}, {0, -1}, {0, 1}}
+
+func pacificAtlantic(heights [][]int) [][]int {
+	res := make([][]int, 0)
+	pacific := make([][]bool, len(heights))
+	atlantic := make([][]bool, len(heights))
+	for i := 0; i < len(heights); i++ {
+		pacific[i] = make([]bool, len(heights[0]))
+		atlantic[i] = make([]bool, len(heights[0]))
+	}
+	// 列
+	for i := 0; i < len(heights); i++ {
+		bfs(heights, pacific, i, 0)
+		bfs(heights, atlantic, i, len(heights[0])-1)
+	}
+	// 行
+	for j := 0; j < len(heights[0]); j++ {
+		bfs(heights, pacific, 0, j)
+		bfs(heights, atlantic, len(heights)-1, j)
+	}
+
+	for i := 0; i < len(heights); i++ {
+		for j := 0; j < len(heights[0]); j++ {
+			if pacific[i][j] && atlantic[i][j] {
+				res = append(res, []int{i, j})
+			}
+		}
+	}
+
+	return res
+}
+
+func bfs(heights [][]int, visited [][]bool, i, j int) {
+	queue := make([][]int, 0)
+	queue = append(queue, []int{i, j})
+	visited[i][j] = true
+	for len(queue) > 0 {
+		cur := queue[0]
+		queue = queue[1:]
+		for _, d := range DIRECTIONS {
+			x, y := cur[0]+d[0], cur[1]+d[1]
+			if x < 0 || x >= len(heights) || y < 0 || y >= len(heights[0]) || heights[cur[0]][cur[1]] > heights[x][y] || visited[x][y] {
+				continue
+			}
+			queue = append(queue, []int{x, y})
+			visited[x][y] = true
+		}
+	}
+}
+```
+
+### Rust
+
+dfs:
 
+```rust
+impl Solution {
+    const DIRECTIONS: [(isize, isize); 4] = [(0, 1), (0, -1), (1, 0), (-1, 0)];
+    pub fn pacific_atlantic(heights: Vec<Vec<i32>>) -> Vec<Vec<i32>> {
+        let (m, n) = (heights.len(), heights[0].len());
+        let mut res = vec![];
+        let (mut pacific, mut atlantic) = (vec![vec![false; n]; m], vec![vec![false; n]; m]);
+
+        // 列
+        for i in 0..m {
+            Self::dfs(&heights, &mut pacific, i, 0);
+            Self::dfs(&heights, &mut atlantic, i, n - 1);
+        }
+
+        for j in 0..n {
+            Self::dfs(&heights, &mut pacific, 0, j);
+            Self::dfs(&heights, &mut atlantic, m - 1, j);
+        }
+
+        for i in 0..m {
+            for j in 0..n {
+                if pacific[i][j] && atlantic[i][j] {
+                    res.push(vec![i as i32, j as i32]);
+                }
+            }
+        }
+
+        res
+    }
+
+    pub fn dfs(heights: &[Vec<i32>], visited: &mut [Vec<bool>], i: usize, j: usize) {
+        visited[i][j] = true;
+        for (dx, dy) in Self::DIRECTIONS {
+            let (x, y) = (i as isize + dx, j as isize + dy);
+            if x < 0 || x >= heights.len() as isize || y < 0 || y >= heights[0].len() as isize {
+                continue;
+            }
+            let (x, y) = (x as usize, y as usize);
+            if !visited[x][y] && heights[x][y] >= heights[i][j] {
+                Self::dfs(heights, visited, x, y);
+            }
+        }
+    }
+}
+```
+
+bfs:
+
+```rust
+use std::collections::VecDeque;
+
+impl Solution {
+    const DIRECTIONS: [(isize, isize); 4] = [(0, 1), (0, -1), (1, 0), (-1, 0)];
+    pub fn pacific_atlantic(heights: Vec<Vec<i32>>) -> Vec<Vec<i32>> {
+        let (m, n) = (heights.len(), heights[0].len());
+        let mut res = vec![];
+        let (mut pacific, mut atlantic) = (vec![vec![false; n]; m], vec![vec![false; n]; m]);
+
+        // 列
+        for i in 0..m {
+            Self::bfs(&heights, &mut pacific, i, 0);
+            Self::bfs(&heights, &mut atlantic, i, n - 1);
+        }
+
+        for j in 0..n {
+            Self::bfs(&heights, &mut pacific, 0, j);
+            Self::bfs(&heights, &mut atlantic, m - 1, j);
+        }
+
+        for i in 0..m {
+            for j in 0..n {
+                if pacific[i][j] && atlantic[i][j] {
+                    res.push(vec![i as i32, j as i32]);
+                }
+            }
+        }
+
+        res
+    }
+
+    pub fn bfs(heights: &[Vec<i32>], visited: &mut [Vec<bool>], i: usize, j: usize) {
+        let mut queue = VecDeque::from([(i, j)]);
+        visited[i][j] = true;
+        while let Some((i, j)) = queue.pop_front() {
+            for (dx, dy) in Self::DIRECTIONS {
+                let (x, y) = (i as isize + dx, j as isize + dy);
+                if x < 0 || x >= heights.len() as isize || y < 0 || y >= heights[0].len() as isize {
+                    continue;
+                }
+                let (x, y) = (x as usize, y as usize);
+                if !visited[x][y] && heights[x][y] >= heights[i][j] {
+                    queue.push_back((x, y));
+                    visited[x][y] = true;
+                }
+            }
+        }
+    }
+}
+```
 
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