{"id":1293,"date":"2016-08-28T21:08:38","date_gmt":"2016-08-28T18:08:38","guid":{"rendered":"http:\/\/java.mazurok.com\/?p=1293"},"modified":"2016-09-19T17:57:48","modified_gmt":"2016-09-19T14:57:48","slug":"__deque","status":"publish","type":"post","link":"https:\/\/java.mazurok.com\/?p=1293","title":{"rendered":"e-olimp 6129. \u0414\u0435\u043a \u043d\u0435\u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440\u0430"},"content":{"rendered":"

\u0417\u0430\u0434\u0430\u0447\u0430<\/a>:<\/h3>\n

\u0420\u0435\u0430\u043b\u0438\u0437\u0443\u0439\u0442\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u0434\u0430\u043d\u043d\u044b\u0445 \u00ab\u0434\u0435\u043a<\/em>\u00ab. \u041d\u0430\u043f\u0438\u0448\u0438\u0442\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0443, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0443\u044e \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0434\u0435\u043a\u0430 \u0438 \u043c\u043e\u0434\u0435\u043b\u0438\u0440\u0443\u044e\u0449\u0443\u044e \u0440\u0430\u0431\u043e\u0442\u0443 \u0434\u0435\u043a\u0430, \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0432 \u0432\u0441\u0435 \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u044b\u0435 \u0437\u0434\u0435\u0441\u044c \u043c\u0435\u0442\u043e\u0434\u044b. \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0441\u0447\u0438\u0442\u044b\u0432\u0430\u0435\u0442 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u043a\u043e\u043c\u0430\u043d\u0434 \u0438 \u0432 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u0442\u0443 \u0438\u043b\u0438 \u0438\u043d\u0443\u044e \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044e. \u041f\u043e\u0441\u043b\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u0430\u0436\u0434\u043e\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u043e\u0434\u043d\u0443 \u0441\u0442\u0440\u043e\u0447\u043a\u0443. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0434\u043b\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b:<\/p>\n

push_front<\/strong><\/p>\n

\u0414\u043e\u0431\u0430\u0432\u0438\u0442\u044c (\u043f\u043e\u043b\u043e\u0436\u0438\u0442\u044c) \u0432 \u043d\u0430\u0447\u0430\u043b\u043e \u0434\u0435\u043a\u0430 \u043d\u043e\u0432\u044b\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442. \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 ok<\/strong>.<\/p>\n

push_back<\/strong><\/p>\n

\u0414\u043e\u0431\u0430\u0432\u0438\u0442\u044c (\u043f\u043e\u043b\u043e\u0436\u0438\u0442\u044c) \u0432 \u043a\u043e\u043d\u0435\u0446 \u0434\u0435\u043a\u0430 \u043d\u043e\u0432\u044b\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442. \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 ok<\/strong>.<\/p>\n

pop_front<\/strong><\/p>\n

\u0418\u0437\u0432\u043b\u0435\u0447\u044c \u0438\u0437 \u0434\u0435\u043a\u0430 \u043f\u0435\u0440\u0432\u044b\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442. \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435.<\/p>\n

pop_back<\/strong><\/p>\n

\u0418\u0437\u0432\u043b\u0435\u0447\u044c \u0438\u0437 \u0434\u0435\u043a\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442. \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435.<\/p>\n

front<\/strong><\/p>\n

\u0423\u0437\u043d\u0430\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u0435\u0440\u0432\u043e\u0433\u043e \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430 (\u043d\u0435 \u0443\u0434\u0430\u043b\u044f\u044f \u0435\u0433\u043e). \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435.<\/p>\n

back<\/strong><\/p>\n

\u0423\u0437\u043d\u0430\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430 (\u043d\u0435 \u0443\u0434\u0430\u043b\u044f\u044f \u0435\u0433\u043e). \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435.<\/p>\n

size<\/strong><\/p>\n

\u0412\u044b\u0432\u0435\u0441\u0442\u0438 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u0432 \u0434\u0435\u043a\u0435.<\/p>\n

clear<\/strong><\/p>\n

\u041e\u0447\u0438\u0441\u0442\u0438\u0442\u044c \u0434\u0435\u043a (\u0443\u0434\u0430\u043b\u0438\u0442\u044c \u0438\u0437 \u043d\u0435\u0433\u043e \u0432\u0441\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b) \u0438 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 ok<\/strong>.<\/p>\n

exit<\/strong>
\n\u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 bye<\/strong> \u0438 \u0437\u0430\u0432\u0435\u0440\u0448\u0438\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u0443.<\/p>\n

\u0422\u0435\u0441\u0442\u044b:<\/strong><\/p>\n\n\n\n\n
\u041f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c<\/td>\n\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442<\/td>\n<\/tr>\n
push_front
\n4
\npush_back
\n5
\nfront
\npush_front
\n3
\nback
\nsize
\npop_front
\npop_back
\nclear
\npop_back
\nsize
\nexit<\/td>\n		ok<\/p>\n

ok<\/p>\n

4
\nok<\/p>\n

5
\n3
\n3
\n5
\nok
\nerror
\n0
\nbye<\/p>\n

 <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

import java.util.Scanner;\r\n\r\npublic class Deque {\r\n\r\n    private class Node {\r\n        Node prev;\r\n        Node next;\r\n        int x;\r\n\r\n        Node() {\r\n            prev = null;\r\n            next = null;\r\n            x = 0;\r\n        }\r\n        Node(Node a, Node b, int c) {\r\n            prev = a;\r\n            next = b;\r\n            x = c;\r\n        }\r\n    };\r\n\r\n    Node Front = null;\r\n    Node Back = null;\r\n    int Size = 0;\r\n\r\n    int size() {\r\n        return Size;\r\n    }\r\n\r\n    void push_back(int p) {\r\n        if (Size == 0) {\r\n            Node NewNode = new Node(Back, Front, p);\r\n            Front = NewNode;\r\n            Back = NewNode;\r\n        } else {\r\n            Node NewNode = new Node(null, Back, p);\r\n            Back.prev = NewNode;\r\n            Back = NewNode;\r\n        }\r\n        Size++;\r\n    }\r\n\r\n    void push_front(int p) {\r\n        if (Size == 0) {\r\n            Node NewNode = new Node(Back, Front, p);\r\n            Front = NewNode;\r\n            Back = NewNode;\r\n        } else {\r\n            Node NewNode = new Node(Front, null, p);\r\n            Front.next = NewNode;\r\n            Front = NewNode;\r\n        }\r\n        Size++;\r\n    }\r\n\r\n    int back() {\r\n        if (Size != 0) {\r\n            return Back.x;\r\n        } else {\r\n            return 0;\r\n        }\r\n    }\r\n\r\n    int front() {\r\n        if (Size != 0) {\r\n            return Front.x;\r\n        } else {\r\n            return 0;\r\n        }\r\n    }\r\n\r\n    int pop_front() {\r\n        if (Size != 0) {\r\n            int x = Front.x;\r\n            Node NewNode = Front.prev;\r\n            Front = NewNode;\r\n            Size--;\r\n            return x;\r\n        } else {\r\n            return 0;\r\n        }\r\n    }\r\n\r\n    int pop_back() {\r\n        if (Size != 0) {\r\n            int x = Back.x;\r\n            Node NewNode = Back.next;\r\n            Back = NewNode;\r\n            Size--;\r\n            return x;\r\n        } else {\r\n            return 0;\r\n        }\r\n    }\r\n\r\n    void clear() {\r\n        while (Size > 0) {\r\n            Node NewNode = Front.prev;\r\n            Front = NewNode;\r\n            Size--;\r\n        }\r\n        Front = null;\r\n        Back = null;\r\n    }\r\n\r\n\r\n    public static void main(String[] args) {\r\n        Deque deque = new Deque();\r\n        Scanner scanner = new Scanner(System.in);\r\n        System.out.println(\"enter your command\");\r\n        String command = scanner.nextLine();\r\n\r\n        while (!command.equals(\"exit\")) {\r\n            if (command.equals(\"push_back\")) {\r\n                int v = scanner.nextInt();\r\n                deque.push_back(v);\r\n                System.out.println(\"ok\\n\");\r\n            } else if (command.equals(\"push_front\")) {\r\n                int v = scanner.nextInt();\r\n                deque.push_front(v);\r\n                System.out.println(\"ok\\n\");\r\n            } else if (command.equals(\"front\")) {\r\n                if (deque.size() > 0) {\r\n                    System.out.println(deque.front());\r\n                } else {\r\n                    System.out.println(\"error\\n\");\r\n                }\r\n            } else if (command.equals(\"back\")) {\r\n                if (deque.size() > 0) {\r\n                    System.out.println(deque.back());\r\n                } else {\r\n                    System.out.println(\"error\\n\");\r\n                }\r\n            } else if (command.equals(\"size\")) {\r\n                System.out.println(deque.size());\r\n            } else if (command.equals(\"pop_front\")) {\r\n                if (deque.size() > 0) {\r\n                    System.out.println(deque.pop_front());\r\n                } else {\r\n                    System.out.println(\"error\\n\");\r\n                }\r\n            } else if (command.equals(\"pop_back\")) {\r\n                if (deque.size() > 0) {\r\n                    System.out.println(deque.pop_back());\r\n                } else {\r\n                    System.out.println(\"error\\n\");\r\n                }\r\n            } else if (command.equals(\"clear\")) {\r\n                System.out.println(\"ok\\n\");\r\n                deque.clear();\r\n            }\r\n            command = scanner.nextLine();\r\n        }\r\n        System.out.println(\"bye\");\r\n    }\r\n};<\/pre>\n
\u0420\u0435\u0448\u0435\u043d\u0438\u0435<\/h1>\n
\u0420\u0435\u0448\u0435\u043d\u0438\u0435 \u043d\u0430 Ideone<\/a>
\n\u0414\u0435\u043a — (\u0434\u0432\u0443\u0445\u0441\u0442\u043e\u0440\u043e\u043d\u043d\u044f\u044f \u043e\u0447\u0435\u0440\u0435\u0434\u044c) \u2014 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u0434\u0430\u043d\u043d\u044b\u0445, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u043c\u043e\u0436\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u0442\u044c \u0438 \u0443\u0434\u0430\u043b\u044f\u0442\u044c \u043a\u0430\u043a \u0432 \u043d\u0430\u0447\u0430\u043b\u043e, \u0442\u0430\u043a \u0438 \u0432 \u043a\u043e\u043d\u0435\u0446, \u0442\u043e \u0435\u0441\u0442\u044c \u0434\u0438\u0441\u0446\u0438\u043f\u043b\u0438\u043d\u0430\u043c\u0438 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e FIFO \u0438 LIFO. \u0414\u043b\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u0435\u043a\u0430 \u043d\u0435\u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u0443\u0434\u043e\u0431\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u0432\u0443\u0441\u0432\u044f\u0437\u043d\u044b\u0439 \u0441\u043f\u0438\u0441\u043e\u043a.<\/p>\n","protected":false},"excerpt":{"rendered":"
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