init

1D.py

@@ -0,0 +1,22 @@
+n, m = map(int, input().split())
+adj = [[] for i in range(n + 1)]
+for i in range(m):
+    u, v = map(int, input().split())
+    adj[u].append(v)
+    adj[v].append(u)
+color = [0] * (n + 1)
+for i in range(1, n + 1):
+    if color[i] == 0:
+        color[i] = 1
+        stack = [i]
+        while stack:
+            u = stack.pop()
+            c = color[u]
+            for v in adj[u]:
+                if color[v] == 0:
+                    color[v] = 3 - c
+                    stack.append(v)
+                elif color[v] == c:
+                    print("-1")
+                    exit()
+print(*(color[1:]))