complete 1918(후위 표기법)

zeta_python/completed/1918.py

@@ -0,0 +1,26 @@
+I = input()
+stack = []
+priority = {"*": 3, "/": 3, "+": 2, "-": 2, "(": 1}
+for i in I:
+    if i in "*/+-()":
+        if len(stack) == 0:
+            stack.append(i)
+            continue
+        if i == ")":
+            while stack[-1] != "(":
+                print(stack.pop(), end='')
+            stack.pop()
+        elif i == "(":
+            stack.append(i)
+        else:
+            while priority[stack[-1]] >= priority[i]:
+                print(stack.pop(), end='')
+                if len(stack) == 0:
+                    break
+            stack.append(i)
+
+    else:
+        print(i, end='')
+else:
+    for s in stack[::-1]:
+        print(s, end='')