Create 0210-course-schedule-ii.go

Accepted submission: _https://leetcode.com/submissions/detail/871343208/_

go/0210-course-schedule-ii.go

@@ -0,0 +1,41 @@
+const CRS = 0
+const PRE = 1
+func findOrder(numCourses int, prerequisites [][]int) []int {
+    prereq := make([][]int, 0)
+    for i := 0; i < numCourses; i++ {
+        prereq = append(prereq, make([]int, 0))
+    }
+    for _, edge := range prerequisites {
+        prereq[edge[CRS]] = append(prereq[edge[CRS]], edge[PRE])
+    }
+
+    output := make([]int, 0)
+    visit, cycle := make([]bool, numCourses), make([]bool, numCourses)
+
+    var dfs func(int) bool
+    dfs = func(crs int) bool {
+        if cycle[crs] {
+            return false
+        } else if visit[crs] {
+            return true
+        }
+
+        cycle[crs] = true
+        for _, pre := range prereq[crs] {
+            if !dfs(pre) {
+                return false
+            }
+        }
+        cycle[crs] = false
+        visit[crs] = true
+        output = append(output, crs)
+        return true
+    }
+
+    for c := 0; c < numCourses; c++ {
+        if dfs(c) == false {
+            return []int{}
+        }
+    }
+    return output
+}