From 8090e4beb10133f5df865a219a87140b50324fda Mon Sep 17 00:00:00 2001
From: Andrew <saintruler@gmail.com>
Date: Wed, 10 Feb 2021 23:06:37 +0400
Subject: =?UTF-8?q?=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=B8=D0=BB=20=D1=80?=
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---
 structures/Makefile   |  7 ++++++-
 structures/queue.h    | 33 +++++++++++++++++++++++++++++++++
 structures/task14.cpp | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 84 insertions(+), 1 deletion(-)
 create mode 100644 structures/queue.h
 create mode 100644 structures/task14.cpp

diff --git a/structures/Makefile b/structures/Makefile
index d2d7739..7dacd52 100644
--- a/structures/Makefile
+++ b/structures/Makefile
@@ -1,5 +1,5 @@
 CXX=g++
-CFLAGS=-Wall
+CFLAGS=-g -Wall
 COMPILE=$(CXX) $(CFLAGS)
 
 task5:
@@ -10,5 +10,10 @@ task8:
 test8: task8
 	printf "10\n1 1 2 3 2 4 3 5 4 1" | ./task.out
 
+task14:
+	$(COMPILE) -o task.out task14.cpp
+test14: task14
+	printf "10\na 2 - e * ^ f + & 0 )" | ./task.out
+
 clean:
 	rm task.out
diff --git a/structures/queue.h b/structures/queue.h
new file mode 100644
index 0000000..368da01
--- /dev/null
+++ b/structures/queue.h
@@ -0,0 +1,33 @@
+#pragma once
+
+struct queue
+{
+    int inf;
+    queue *next;
+};
+
+void push(queue *&h, queue *&t, int x)
+{
+    queue *r = new queue;
+    r->inf = x;
+    r->next = NULL;
+    
+    if (!h && !t)
+        h = t = r;
+    else
+    {
+        t->next = r;
+        t = r;
+    }
+}
+
+int pop(queue *&h, queue *&t)
+{
+    queue *r = h;
+    int i = h->inf;
+    h = h->next;
+
+    if (!h) t = NULL;
+    delete r;
+    return i;
+}
diff --git a/structures/task14.cpp b/structures/task14.cpp
new file mode 100644
index 0000000..fcd9d63
--- /dev/null
+++ b/structures/task14.cpp
@@ -0,0 +1,45 @@
+#include <iostream>
+#include "queue.h"
+
+using namespace std;
+
+void result(queue *&h, queue *&t, queue *&hr, queue *&tr)
+{
+    while (h)
+    {
+        int el = char(pop(h, t));
+        if (  '0' <= el && el <= '9'
+           || 'a' <= el && el <= 'z' 
+           || 'A' <= el && el <= 'Z' )
+        {
+            push(hr, tr, int(el));
+        }
+    }
+}
+
+int main()
+{
+    int n;
+    cout << "n = ";
+    cin >> n;
+
+    queue *head = NULL;
+    queue *tail = NULL;
+    char x;
+    for (int i = 0; i < n; i++)
+    {
+        cin >> x;
+        push(head, tail, int(x));
+    }
+
+    queue *head_res = NULL;
+    queue *tail_res = NULL;
+
+    result(head, tail, head_res, tail_res);
+    while (head_res)
+        cout << char(pop(head_res, tail_res)) << " ";
+    cout << endl;
+
+    return 0;
+
+}
-- 
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