Merge pull request #2697 from sxdtywm/patch-5

Update 0105.有向图的完全可达性.md for java python and go

Author: youngyangyang04

problems/kamacoder/0105.有向图的完全可达性.md

@@ -289,6 +289,55 @@ int main() {
 
 ### Java 
 
+```java
+
+import java.util.*;
+
+public class Main {
+
+    public static void dfs(List<List<Integer>> graph, int key, boolean[] visited) {
+        for (int neighbor : graph.get(key)) {
+            if (!visited[neighbor]) {  // Check if the next node is not visited
+                visited[neighbor] = true;
+                dfs(graph, neighbor, visited);
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        int n = scanner.nextInt();
+        int m = scanner.nextInt();
+
+        List<List<Integer>> graph = new ArrayList<>();
+        for (int i = 0; i <= n; i++) {
+            graph.add(new ArrayList<>());
+        }
+
+        for (int i = 0; i < m; i++) {
+            int s = scanner.nextInt();
+            int t = scanner.nextInt();
+            graph.get(s).add(t);
+        }
+
+        boolean[] visited = new boolean[n + 1];
+        visited[1] = true;  // Process node 1 beforehand
+        dfs(graph, 1, visited);
+
+        for (int i = 1; i <= n; i++) {
+            if (!visited[i]) {
+                System.out.println(-1);
+                return;
+            }
+        }
+        System.out.println(1);
+    }
+}
+
+
+```
+
+
 ### Python
 BFS算法
 ```Python
@@ -327,8 +376,103 @@ if __name__ == "__main__":
 
 ```
 
+``` python
+
+def dfs(graph, key, visited):
+    for neighbor in graph[key]:
+        if not visited[neighbor]:  # Check if the next node is not visited
+            visited[neighbor] = True
+            dfs(graph, neighbor, visited)
+
+def main():
+    import sys
+    input = sys.stdin.read
+    data = input().split()
+
+    n = int(data[0])
+    m = int(data[1])
+    
+    graph = [[] for _ in range(n + 1)]
+    index = 2
+    for _ in range(m):
+        s = int(data[index])
+        t = int(data[index + 1])
+        graph[s].append(t)
+        index += 2
+
+    visited = [False] * (n + 1)
+    visited[1] = True  # Process node 1 beforehand
+    dfs(graph, 1, visited)
+
+    for i in range(1, n + 1):
+        if not visited[i]:
+            print(-1)
+            return
+    
+    print(1)
+
+if __name__ == "__main__":
+    main()
+
+
+```
+
 ### Go
 
+```go
+
+package main
+
+import (
+    "bufio"
+    "fmt"
+    "os"
+)
+
+func dfs(graph [][]int, key int, visited []bool) {
+    visited[key] = true
+    for _, neighbor := range graph[key] {
+        if !visited[neighbor] {
+            dfs(graph, neighbor, visited)
+        }
+    }
+}
+
+func main() {
+    scanner := bufio.NewScanner(os.Stdin)
+    scanner.Scan()
+    var n, m int
+    fmt.Sscanf(scanner.Text(), "%d %d", &n, &m)
+
+    graph := make([][]int, n+1)
+    for i := 0; i <= n; i++ {
+        graph[i] = make([]int, 0)
+    }
+
+    for i := 0; i < m; i++ {
+        scanner.Scan()
+        var s, t int
+        fmt.Sscanf(scanner.Text(), "%d %d", &s, &t)
+        graph[s] = append(graph[s], t)
+    }
+
+    visited := make([]bool, n+1)
+
+    dfs(graph, 1, visited)
+
+    for i := 1; i <= n; i++ {
+        if !visited[i] {
+            fmt.Println(-1)
+            return
+        }
+    }
+    fmt.Println(1)
+}
+
+
+```
+
+
 ### Rust
 
 ### Javascript