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boj/2568.py

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+import bisect
+from sys import stdin
+input=stdin.readline
+n=int(input())
+arr=[]
+
+for i in range(n):
+    inp=tuple(map(int,input().split()))
+    arr.append(inp)
+
+arr.sort(key=lambda x:x[1])
+l=[0]
+lt=[(0,0)]
+
+for i in arr:
+    a,b=i
+    if l[-1]<a:
+        l.append(a)
+        lt.append((a,len(l)-1))
+    else:
+        p=bisect.bisect_left(l,a)
+        l[p]=a
+        lt.append((a,p))
+
+target=len(l)-1
+darr=[]
+
+for i in lt[::-1]:
+    if i[1]==target:
+        target-=1
+    else:
+        darr.append(i[0])
+
+# print(darr)
+darr.sort()
+print(len(darr))
+for i in darr:
+    print(i)