first commit

from old repository to a new repository

boj/10828.py

@@ -0,0 +1,27 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+stack=[]
+
+for _ in range(n):
+    s=stdin.readline().rstrip().split()
+
+    if len(s)==1:
+        if s[0]=='pop':
+            if len(stack)==0:
+                print(-1)
+            else:
+                print(stack.pop())
+        elif s[0]=='top':
+            if len(stack)==0:
+                print(-1)
+            else:
+                print(stack[-1])
+        elif s[0]=='size':
+            print(len(stack))
+        else:
+            if len(stack)==0:
+                print(1)
+            else:
+                print(0)
+    else:
+        stack.append(int(s[1]))