[BOJ] 스택 / 실버 4 / 40분

https://www.acmicpc.net/problem/10828

Author: YoonYn9915

YoonYn9915/implementation/2025-06-21-[백준]-#10828-스택.py

@@ -0,0 +1,30 @@
+import sys
+input = sys.stdin.readline
+
+N = int(input())
+
+stack = []
+def query():
+    Q = input().split()
+    if Q[0] == "push":
+        stack.append(int(Q[1]))
+    elif Q[0] == "pop":
+        if len(stack):
+            print(stack.pop())
+        else:
+            print(-1)
+    elif Q[0] == "size":
+        print(len(stack))
+    elif Q[0] == "empty":
+        if len(stack):
+            print(0)
+        else:
+            print(1)
+    elif Q[0] == "top":
+        if len(stack):
+            print(stack[-1])
+        else:
+            print(-1)
+
+for _ in range(N):
+    query()