diff --git a/tester/v1/openapi.yaml b/tester/v1/openapi.yaml
index 612a273..1e41306 100644
--- a/tester/v1/openapi.yaml
+++ b/tester/v1/openapi.yaml
@@ -13,12 +13,14 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
         - name: pageSize
           in: query
           required: true
           schema:
             type: integer
             format: int32
+          example: 10
       security:
         - bearerAuth: [ ]
       responses:
@@ -51,6 +53,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -69,6 +72,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 3
       responses:
         "200":
           description: OK
@@ -84,6 +88,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 3
       requestBody:
         required: true
         content:
@@ -104,12 +109,14 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
         - name: pageSize
           in: query
           required: true
           schema:
             type: integer
             format: int32
+          example: 10
       security:
         - bearerAuth: [ ]
       responses:
@@ -142,6 +149,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -160,6 +168,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 3
       responses:
         "200":
           description: OK
@@ -174,6 +183,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 3
       requestBody:
         required: true
         content:
@@ -195,12 +205,14 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
         - name: problem_id
           in: query
           required: true
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -220,6 +232,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -238,6 +251,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 3
       responses:
         "200":
           description: OK
@@ -253,18 +267,21 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
         - name: page
           in: query
           required: true
           schema:
             type: integer
             format: int32
+          example: 1
         - name: pageSize
           in: query
           required: true
           schema:
             type: integer
             format: int32
+          example: 10
       responses:
         "200":
           description: OK
@@ -283,12 +300,14 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
         - name: user_id
           in: query
           required: true
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -307,6 +326,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -321,6 +341,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
       requestBody:
         required: true
         content:
@@ -342,12 +363,14 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
         - name: language
           in: query
           required: true
           schema:
             type: integer
             format: int32
+          example: 1
       requestBody:
         required: true
         content:
@@ -372,42 +395,50 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
         - name: pageSize
           in: query
           required: true
           schema:
             type: integer
             format: int32
+          example: 10
         - name: contest_id
           in: query
           schema:
             type: integer
             format: int32
+          example: 1
         - name: participantId
           in: query
           schema:
             type: integer
             format: int32
+          example: 1
         - name: task_id
           in: query
           schema:
             type: integer
             format: int32
+          example: 1
         - name: state
           in: query
           schema:
             type: integer
             format: int32
+          example: 1
         - name: order
           in: query
           schema:
             type: integer
             format: int32
+          example: 1
         - name: language
           in: query
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -427,6 +458,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -446,6 +478,7 @@ paths:
           schema:
             type: integer
             format: int32
+          example: 1
       responses:
         "200":
           description: OK
@@ -455,6 +488,20 @@ paths:
                 $ref: '#/components/schemas/GetMonitorResponse'
 components:
   schemas:
+    Pagination:
+      type: object
+      required:
+        - page
+        - total
+      properties:
+        page:
+          type: integer
+          format: int32
+          example: 1
+        total:
+          type: integer
+          format: int32
+          example: 10
     Problem:
       type: object
       required:
@@ -481,14 +528,18 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
         title:
           type: string
+          example: "Test problem"
         time_limit:
           type: integer
           format: int32
+          example: 1000
         memory_limit:
           type: integer
           format: int32
+          example: 256
 
         legend:
           type: string
@@ -518,7 +569,7 @@ components:
         updated_at:
           type: string
           format: date-time
-    ProblemListItem:
+    ProblemsListItem:
       type: object
       required:
         - id
@@ -549,19 +600,14 @@ components:
       type: object
       required:
         - problems
-        - page
-        - max_page
+        - pagination
       properties:
         problems:
           type: array
           items:
-            $ref: '#/components/schemas/ProblemListItem'
-        page:
-          type: integer
-          format: int32
-        max_page:
-          type: integer
-          format: int32
+            $ref: '#/components/schemas/ProblemsListItem'
+        pagination:
+          $ref: '#/components/schemas/Pagination'
     CreateProblemResponse:
       type: object
       required:
@@ -570,6 +616,7 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
     GetProblemResponse:
       type: object
       required:
@@ -588,8 +635,10 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
         title:
           type: string
+          example: "Test contest"
         created_at:
           type: string
           format: date-time
@@ -607,8 +656,10 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
         title:
           type: string
+          example: "Test contest"
         created_at:
           type: string
           format: date-time
@@ -619,19 +670,14 @@ components:
       type: object
       required:
         - contests
-        - page
-        - max_page
+        - pagination
       properties:
         contests:
           type: array
           items:
             $ref: '#/components/schemas/ContestsListItem'
-        page:
-          type: integer
-          format: int32
-        max_page:
-          type: integer
-          format: int32
+        pagination:
+          $ref: '#/components/schemas/Pagination'
     CreateContestResponse:
       type: object
       required:
@@ -640,6 +686,7 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
     TasksListItem:
       type: object
       required:
@@ -655,20 +702,26 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
         problem_id:
           type: integer
           format: int32
+          example: 1
         position:
           type: integer
           format: int32
+          example: 1
         title:
           type: string
+          example: "Test task"
         memory_limit:
           type: integer
           format: int32
+          example: 256
         time_limit:
           type: integer
           format: int32
+          example: 1000
         created_at:
           type: string
           format: date-time
@@ -703,6 +756,7 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
     AddTaskResponse:
       type: object
       required:
@@ -711,6 +765,7 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
     ParticipantsListItem:
       type: object
       required:
@@ -723,11 +778,14 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
         name:
           type: string
+          example: "Test user"
         user_id:
           type: integer
           format: int32
+          example: 1
         created_at:
           type: string
           format: date-time
@@ -738,24 +796,20 @@ components:
       type: object
       required:
         - participants
-        - page
-        - max_page
+        - pagination
       properties:
         participants:
           type: array
           items:
             $ref: '#/components/schemas/ParticipantsListItem'
-        page:
-          type: integer
-          format: int32
-        max_page:
-          type: integer
-          format: int32
+        pagination:
+          $ref: '#/components/schemas/Pagination'
     UpdateProblemRequest:
       type: object
       properties:
         title:
           type: string
+          example: "Test problem"
         legend:
           type: string
         input_format:
@@ -769,19 +823,23 @@ components:
         memory_limit:
           type: integer
           format: int32
+          example: 256
         time_limit:
           type: integer
           format: int32
+          example: 1000
     UpdateContestRequest:
       type: object
       properties:
         title:
           type: string
+          example: "Test contest"
     UpdateParticipantRequest:
       type: object
       properties:
         name:
           type: string
+          example: "Test user"
     CreateSolutionRequest:
       type: object
       required:
@@ -790,6 +848,7 @@ components:
         solution:
           type: string
           format: binary
+          example: 'print("Hello, world!")'
     CreateSolutionResponse:
       type: object
       required:
@@ -798,23 +857,19 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
     ListSolutionsResponse:
       type: object
       required:
         - solutions
-        - page
-        - max_page
+        - pagination
       properties:
         solutions:
           type: array
           items:
             $ref: '#/components/schemas/SolutionsListItem'
-        page:
-          type: integer
-          format: int32
-        max_page:
-          type: integer
-          format: int32
+        pagination:
+          $ref: '#/components/schemas/Pagination'
     SolutionsListItem:
       type: object
       required:
@@ -833,30 +888,39 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
         task_id:
           type: integer
           format: int32
+          example: 1
         contest_id:
           type: integer
           format: int32
+          example: 1
         participant_id:
           type: integer
           format: int32
+          example: 1
         state:
           type: integer
           format: int32
+          example: 1
         score:
           type: integer
           format: int32
+          example: 100
         penalty:
           type: integer
           format: int32
+          example: 28
         total_score:
           type: integer
           format: int32
+          example: 100
         language:
           type: integer
           format: int32
+          example: 1
         updated_at:
           type: string
           format: date-time
@@ -881,29 +945,38 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
         task_id:
           type: integer
           format: int32
+          example: 1
         participant_id:
           type: integer
           format: int32
+          example: 1
         state:
           type: integer
           format: int32
+          example: 1
         score:
           type: integer
           format: int32
+          example: 100
         penalty:
           type: integer
           format: int32
+          example: 28
         total_score:
           type: integer
           format: int32
+          example: 100
         language:
           type: integer
           format: int32
+          example: 1
         solution:
           type: string
+          example: 'print("Hello, world!")'
         updated_at:
           type: string
           format: date-time
@@ -938,17 +1011,22 @@ components:
         id:
           type: integer
           format: int32
+          example: 1
         position:
           type: integer
           format: int32
+          example: 1
         title:
           type: string
+          example: "Test task"
         time_limit:
           type: integer
           format: int32
+          example: 1000
         memory_limit:
           type: integer
           format: int32
+          example: 256
 
         legend_html:
           type: string
@@ -972,92 +1050,85 @@ components:
       required:
         - task
         - contest
+        - tasks
       properties:
         contest:
-          type: object
-          required:
-            - id
-            - title
-            - tasks
-          properties:
-            id:
-              type: integer
-              format: int32
-            title:
-              type: string
-            tasks:
-              type: array
-              items:
-                $ref: '#/components/schemas/TasksListItem'
+          $ref: '#/components/schemas/Contest'
+        tasks:
+          type: array
+          items:
+            $ref: '#/components/schemas/TasksListItem'
         task:
           $ref: '#/components/schemas/Task'
     GetMonitorResponse:
       type: object
       required:
         - contest
+        - tasks
         - participants
         - summary_per_problem
       properties:
         contest:
-          type: object
-          required:
-            - id
-            - title
-            - tasks
-          properties:
-            id:
-              type: integer
-              format: int32
-            title:
-              type: string
-            tasks:
-              type: array
-              items:
-                $ref: '#/components/schemas/TasksListItem'
+          $ref: '#/components/schemas/Contest'
+        tasks:
+          type: array
+          items:
+            $ref: '#/components/schemas/TasksListItem'
         participants:
           type: array
           items:
-            type: object
-            required:
-              - id
-              - name
-              - solved_in_total
-              - penalty_in_total
-              - solutions
-            properties:
-              id:
-                type: integer
-                format: int32
-              name:
-                type: string
-              solved_in_total:
-                type: integer
-                format: int32
-              penalty_in_total:
-                type: integer
-                format: int32
-              solutions:
-                type: array
-                items:
-                  $ref: '#/components/schemas/SolutionsListItem'
+            $ref: '#/components/schemas/ParticipantsStat'
         summary_per_problem:
           type: array
           items:
-            type: object
-            required:
-              - id
-              - success
-              - total
-            properties:
-              id:
-                type: integer
-                format: int32
-              success:
-                type: integer
-                format: int32
-              total:
-                type: integer
-                format: int32
+            $ref: '#/components/schemas/ProblemStatSummary'
+    ProblemStatSummary:
+      type: object
+      required:
+        - id
+        - success
+        - total
+      properties:
+        id:
+          type: integer
+          format: int32
+          example: 1
+        success:
+          type: integer
+          format: int32
+          example: 14
+        total:
+          type: integer
+          format: int32
+          example: 20
+    ParticipantsStat:
+      type: object
+      required:
+        - id
+        - name
+        - solved_in_total
+        - penalty_in_total
+        - solutions
+      properties:
+        id:
+          type: integer
+          format: int32
+          example: 1
+        name:
+          type: string
+          example: "John Doe"
+        solved_in_total:
+          type: integer
+          format: int32
+          example: 3
+        penalty_in_total:
+          type: integer
+          format: int32
+          example: 144
+        solutions:
+          type: array
+          items:
+            $ref: '#/components/schemas/SolutionsListItem'
   securitySchemes:
     bearerAuth:
       type: http