diff --git a/Gemfile b/Gemfile
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'rails', '3.2.8'
+gem 'rails', '3.2.19'
 
 # Bundle edge Rails instead:
 # gem 'rails', :git => 'git://github.com/rails/rails.git'
@@ -35,6 +35,12 @@
 
 # To use debugger
 # gem 'debugger'
+#
+
+gem 'jquery-rails'
+gem 'jquery-ui-sass-rails'
+gem 'jquery-timepicker-addon-rails'
+
 
 gem "haml"
 gem "mail"
diff --git a/Gemfile.lock b/Gemfile.lock
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,130 +1,146 @@
 GIT
   remote: git://github.com/sikachu/verification.git
-  revision: 344ad2535da3dc9671872628ff9c79d6f59af9da
+  revision: 76eaf51b13276ecae54bd9cd115832595d2ff56d
   specs:
     verification (1.0.3)
-      actionpack (>= 3.0.0, < 3.3.0)
-      activesupport (>= 3.0.0, < 3.3.0)
+      actionpack (>= 3.0.0, < 5.0)
+      activesupport (>= 3.0.0, < 5.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (3.2.8)
-      actionpack (= 3.2.8)
-      mail (~> 2.4.4)
-    actionpack (3.2.8)
-      activemodel (= 3.2.8)
-      activesupport (= 3.2.8)
+    actionmailer (3.2.19)
+      actionpack (= 3.2.19)
+      mail (~> 2.5.4)
+    actionpack (3.2.19)
+      activemodel (= 3.2.19)
+      activesupport (= 3.2.19)
       builder (~> 3.0.0)
       erubis (~> 2.7.0)
       journey (~> 1.0.4)
-      rack (~> 1.4.0)
+      rack (~> 1.4.5)
       rack-cache (~> 1.2)
       rack-test (~> 0.6.1)
-      sprockets (~> 2.1.3)
-    activemodel (3.2.8)
-      activesupport (= 3.2.8)
+      sprockets (~> 2.2.1)
+    activemodel (3.2.19)
+      activesupport (= 3.2.19)
       builder (~> 3.0.0)
-    activerecord (3.2.8)
-      activemodel (= 3.2.8)
-      activesupport (= 3.2.8)
+    activerecord (3.2.19)
+      activemodel (= 3.2.19)
+      activesupport (= 3.2.19)
       arel (~> 3.0.2)
       tzinfo (~> 0.3.29)
-    activeresource (3.2.8)
-      activemodel (= 3.2.8)
-      activesupport (= 3.2.8)
-    activesupport (3.2.8)
-      i18n (~> 0.6)
+    activeresource (3.2.19)
+      activemodel (= 3.2.19)
+      activesupport (= 3.2.19)
+    activesupport (3.2.19)
+      i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
-    arel (3.0.2)
-    builder (3.0.3)
+    arel (3.0.3)
+    builder (3.0.4)
     coffee-rails (3.2.2)
       coffee-script (>= 2.2.0)
       railties (~> 3.2.0)
-    coffee-script (2.2.0)
+    coffee-script (2.3.0)
       coffee-script-source
       execjs
-    coffee-script-source (1.3.3)
-    diff-lcs (1.1.3)
+    coffee-script-source (1.7.1)
+    diff-lcs (1.2.5)
     dynamic_form (1.1.4)
     erubis (2.7.0)
-    execjs (1.4.0)
-      multi_json (~> 1.0)
-    haml (3.1.7)
-    hike (1.2.1)
-    i18n (0.6.1)
+    execjs (2.2.1)
+    haml (4.0.5)
+      tilt
+    hike (1.2.3)
+    i18n (0.6.11)
     in_place_editing (1.2.0)
     journey (1.0.4)
-    json (1.7.5)
-    mail (2.4.4)
-      i18n (>= 0.4.0)
+    jquery-rails (3.1.1)
+      railties (>= 3.0, < 5.0)
+      thor (>= 0.14, < 2.0)
+    jquery-timepicker-addon-rails (1.4.1)
+      railties (>= 3.1)
+    jquery-ui-rails (4.0.3)
+      jquery-rails
+      railties (>= 3.1.0)
+    jquery-ui-sass-rails (4.0.3.0)
+      jquery-rails
+      jquery-ui-rails (= 4.0.3)
+      railties (>= 3.1.0)
+    json (1.8.1)
+    mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
-    mime-types (1.19)
-    multi_json (1.3.6)
-    mysql2 (0.3.11)
-    polyglot (0.3.3)
+    mime-types (1.25.1)
+    multi_json (1.10.1)
+    mysql2 (0.3.16)
+    polyglot (0.3.5)
+    power_assert (0.1.3)
     prototype-rails (3.2.1)
       rails (~> 3.2)
-    rack (1.4.1)
+    rack (1.4.5)
     rack-cache (1.2)
       rack (>= 0.4)
-    rack-ssl (1.3.2)
+    rack-ssl (1.3.4)
       rack
     rack-test (0.6.2)
       rack (>= 1.0)
-    rails (3.2.8)
-      actionmailer (= 3.2.8)
-      actionpack (= 3.2.8)
-      activerecord (= 3.2.8)
-      activeresource (= 3.2.8)
-      activesupport (= 3.2.8)
+    rails (3.2.19)
+      actionmailer (= 3.2.19)
+      actionpack (= 3.2.19)
+      activerecord (= 3.2.19)
+      activeresource (= 3.2.19)
+      activesupport (= 3.2.19)
       bundler (~> 1.0)
-      railties (= 3.2.8)
-    railties (3.2.8)
-      actionpack (= 3.2.8)
-      activesupport (= 3.2.8)
+      railties (= 3.2.19)
+    railties (3.2.19)
+      actionpack (= 3.2.19)
+      activesupport (= 3.2.19)
       rack-ssl (~> 1.3.2)
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
-    rake (0.9.2.2)
-    rdiscount (1.6.8)
-    rdoc (3.12)
+    rake (10.3.2)
+    rdiscount (2.1.7.1)
+    rdoc (3.12.2)
       json (~> 1.4)
-    rspec (2.11.0)
-      rspec-core (~> 2.11.0)
-      rspec-expectations (~> 2.11.0)
-      rspec-mocks (~> 2.11.0)
-    rspec-core (2.11.1)
-    rspec-expectations (2.11.3)
-      diff-lcs (~> 1.1.3)
-    rspec-mocks (2.11.3)
-    rspec-rails (2.11.0)
+    rspec-collection_matchers (1.0.0)
+      rspec-expectations (>= 2.99.0.beta1)
+    rspec-core (2.99.2)
+    rspec-expectations (2.99.2)
+      diff-lcs (>= 1.1.3, < 2.0)
+    rspec-mocks (2.99.2)
+    rspec-rails (2.99.0)
       actionpack (>= 3.0)
+      activemodel (>= 3.0)
       activesupport (>= 3.0)
       railties (>= 3.0)
-      rspec (~> 2.11.0)
-    sass (3.2.1)
-    sass-rails (3.2.5)
+      rspec-collection_matchers
+      rspec-core (~> 2.99.0)
+      rspec-expectations (~> 2.99.0)
+      rspec-mocks (~> 2.99.0)
+    sass (3.4.1)
+    sass-rails (3.2.6)
       railties (~> 3.2.0)
       sass (>= 3.1.10)
       tilt (~> 1.3)
-    sprockets (2.1.3)
+    sprockets (2.2.2)
       hike (~> 1.2)
+      multi_json (~> 1.0)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
-    test-unit (2.5.2)
-    thor (0.16.0)
-    tilt (1.3.3)
-    treetop (1.4.10)
+    test-unit (3.0.1)
+      power_assert
+    thor (0.19.1)
+    tilt (1.4.1)
+    treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (0.3.33)
-    uglifier (1.3.0)
+    tzinfo (0.3.41)
+    uglifier (2.5.3)
       execjs (>= 0.3.0)
-      multi_json (~> 1.0, >= 1.0.2)
-    will_paginate (3.0.3)
+      json (>= 1.8.0)
+    will_paginate (3.0.7)
 
 PLATFORMS
   ruby
@@ -134,10 +150,13 @@
   dynamic_form
   haml
   in_place_editing
+  jquery-rails
+  jquery-timepicker-addon-rails
+  jquery-ui-sass-rails
   mail
   mysql2
   prototype-rails
-  rails (= 3.2.8)
+  rails (= 3.2.19)
   rdiscount
   rspec-rails (~> 2.0)
   sass-rails (~> 3.2.3)
diff --git a/app/assets/javascripts/new.js b/app/assets/javascripts/new.js
new file mode 100644
--- /dev/null
+++ b/app/assets/javascripts/new.js
@@ -0,0 +1,6 @@
+//= require jquery
+//= require jquery_ujs
+//= require jquery.ui.all
+//= require jquery.ui.datepicker
+//= require jquery.ui.slider
+//= require jquery-ui-timepicker-addon
diff --git a/app/assets/javascripts/report.js.coffee b/app/assets/javascripts/report.js.coffee
new file mode 100644
--- /dev/null
+++ b/app/assets/javascripts/report.js.coffee
@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://jashkenas.github.com/coffee-script/
diff --git a/app/assets/stylesheets/application.css.sass b/app/assets/stylesheets/application.css.sass
--- a/app/assets/stylesheets/application.css.sass
+++ b/app/assets/stylesheets/application.css.sass
@@ -1,3 +1,11 @@
+
+@import jquery.ui.core
+@import jquery.ui.theme
+@import jquery.ui.datepicker
+@import jquery.ui.slider
+@import jquery-ui-timepicker-addon
+
+
 body
   background: white image-url("topbg.jpg") repeat-x top center
   font-size: 13px
@@ -290,4 +298,4 @@
 
 h2.contest-title
   margin-top: 5px
-  margin-bottom: 5px
\ No newline at end of file
+  margin-bottom: 5px
diff --git a/app/assets/stylesheets/report.css.scss b/app/assets/stylesheets/report.css.scss
new file mode 100644
--- /dev/null
+++ b/app/assets/stylesheets/report.css.scss
@@ -0,0 +1,3 @@
+// Place all the styles related to the report controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/
diff --git a/app/controllers/login_controller.rb b/app/controllers/login_controller.rb
--- a/app/controllers/login_controller.rb
+++ b/app/controllers/login_controller.rb
@@ -22,6 +22,9 @@
         end
       end
 
+      #save login information
+      Login.create(user_id: user.id, ip_address: request.remote_ip)
+
       redirect_to :controller => 'main', :action => 'list'
     else
       flash[:notice] = 'Wrong password'
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -13,6 +13,7 @@
       append_to menu_items, '[Problems]', 'problems', 'index'
       append_to menu_items, '[Users]', 'user_admin', 'index'
       append_to menu_items, '[Results]', 'user_admin', 'user_stat'
+      append_to menu_items, '[Report]', 'report', 'login_stat'
       append_to menu_items, '[Graders]', 'graders', 'list'
       append_to menu_items, '[Contests]', 'contest_management', 'index'
       append_to menu_items, '[Sites]', 'sites', 'index'
diff --git a/app/helpers/report_helper.rb b/app/helpers/report_helper.rb
new file mode 100644
--- /dev/null
+++ b/app/helpers/report_helper.rb
@@ -0,0 +1,2 @@
+module ReportHelper
+end
diff --git a/app/models/login.rb b/app/models/login.rb
new file mode 100644
--- /dev/null
+++ b/app/models/login.rb
@@ -0,0 +1,3 @@
+class Login < ActiveRecord::Base
+  attr_accessible :ip_address, :logged_in_at, :user_id
+end
diff --git a/app/models/problem.rb b/app/models/problem.rb
--- a/app/models/problem.rb
+++ b/app/models/problem.rb
@@ -14,7 +14,7 @@
   DEFAULT_MEMORY_LIMIT = 32
 
   def self.find_available_problems
-    Problem.available.all(:order => "date_added DESC")
+    Problem.available.all(:order => "date_added DESC, name ASC")
   end
 
   def self.create_from_import_form_params(params, old_problem=nil)
@@ -43,6 +43,7 @@
     if not importer.import_from_file(import_params[:file], 
                                      import_params[:time_limit], 
                                      import_params[:memory_limit],
+                                     import_params[:checker_name],
                                      import_to_db)
       problem.errors.add_to_base('Import error.')
     end
@@ -90,6 +91,11 @@
       problem.errors.add_to_base('No testdata file.')
     end
 
+    checker_name = 'text'
+    if ['text','float'].include? params[:checker]
+      checker_name = params[:checker]
+    end
+
     file = params[:file]
 
     if !problem.errors.empty?
@@ -106,7 +112,8 @@
     return [{
               :time_limit => time_limit,
               :memory_limit => memory_limit,
-              :file => file
+              :file => file,
+              :checker_name => checker_name
             },
             problem]
   end
diff --git a/app/models/user.rb b/app/models/user.rb
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,5 +1,7 @@
 require 'digest/sha1'
 require 'net/pop'
+require 'net/https'
+require 'net/http'
 require 'json'
 
 class User < ActiveRecord::Base
@@ -81,7 +83,7 @@
     end
   end
 
-  def authenticated_by_pop3?(password) 
+  def authenticated_by_pop3?(password)
     Net::POP3.enable_ssl
     pop = Net::POP3.new('pops.it.chula.ac.th')
     authen = true
@@ -107,8 +109,15 @@
 
     #simple call
     begin
-      resp = Net::HTTP.post_form(url, post_args)
-      result = JSON.parse resp.body
+      http = Net::HTTP.new('www.cas.chula.ac.th', 443)
+      http.use_ssl = true
+      result = [ ]
+      http.start do |http|
+        req = Net::HTTP::Post.new('/cas/api/?q=studentAuthenticate')
+        param = "appid=#{appid}&appsecret=#{appsecret}&username=#{login}&password=#{password}"
+        resp = http.request(req,param)
+        result = JSON.parse resp.body
+      end
       return true if result["type"] == "beanStudent"
     rescue
       return false
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -5,7 +5,9 @@
   <%= stylesheet_link_tag "application", :media => "all" %>
   <%= javascript_include_tag "application" %>
   <%= csrf_meta_tags %>
+  <%= content_for :header %>
   <%= yield :head %>
+
 </head>
 <body>
 
diff --git a/app/views/main/_problem.html.erb b/app/views/main/_problem.html.erb
--- a/app/views/main/_problem.html.erb
+++ b/app/views/main/_problem.html.erb
@@ -3,7 +3,7 @@
     <%= "#{problem_counter+1}" %>
   </td>
   <td>
-    <%= "#{problem.full_name} (#{problem.name})" %>
+    <%= "(#{problem.name}) #{problem.full_name}" %>
     <%= link_to_description_if_any "[#{t 'main.problem_desc'}]", problem %>
   </td>
   <td align="center">
diff --git a/app/views/problems/import.html.haml b/app/views/problems/import.html.haml
--- a/app/views/problems/import.html.haml
+++ b/app/views/problems/import.html.haml
@@ -32,6 +32,19 @@
             %br/
             You may put task description in *.html for raw html
             and *.md or *.markdown for markdown.
+            %br/
+            You may also put a pdf file for the task description
+      %tr
+        %td Checker:
+        %td= select_tag 'checker', options_for_select([['Text checker','text'],['Float checker','float']], 'text')
+      %tr
+        %td
+        %td
+          %span{:class => 'help'}
+            "Text" checker checks if the text (including numbers) is the same, ignoring any whitespace
+            %br/
+            "Float" checker checks if all numbers is within EPSILON error using formula |a-b| < EPSILON * max(|a|,|b|)
+
       - if @allow_test_pair_import
         %tr
           %td
diff --git a/app/views/report/_date_range.html.haml b/app/views/report/_date_range.html.haml
new file mode 100644
--- /dev/null
+++ b/app/views/report/_date_range.html.haml
@@ -0,0 +1,23 @@
+
+= form_tag({session: :url })  do
+  .submitbox
+    %table
+      %tr
+        %td{colspan: 6, style: 'font-weight: bold'}= title
+      %tr
+        %td{style: 'width: 120px; font-weight: bold'}= param_text
+        %td{align: 'right'} since:
+        %td= text_field_tag 'since_datetime'
+      %tr
+        %td
+        %td{align: 'right'} until:
+        %td= text_field_tag 'until_datetime'
+      %tr
+        %td
+        %td
+        %td Blank mean no condition
+      %tr
+        %td
+        %td
+        %td= submit_tag 'query'
+
diff --git a/app/views/report/login_stat.html.haml b/app/views/report/login_stat.html.haml
new file mode 100644
--- /dev/null
+++ b/app/views/report/login_stat.html.haml
@@ -0,0 +1,33 @@
+- content_for :header do
+  = javascript_include_tag 'new'
+
+%script{:type=>"text/javascript"}
+  $(function () {
+  $('#since_datetime').datetimepicker({ showButtonPanel: true, dateFormat: "yy-mm-dd", controlType: "slider"} );
+  $('#until_datetime').datetimepicker({ showButtonPanel: true, dateFormat: "yy-mm-dd", controlType: "slider"} );
+  });
+
+
+%h1 Login status
+
+
+=render partial: 'report_menu'
+=render partial: 'date_range', locals: {param_text: 'Login date range:', title: 'Query login stat in the range'  }
+
+%table.info
+  %thead
+    %tr.info-head
+      %th login
+      %th full name
+      %th login count
+      %th earliest
+      %th latest
+  %tbody
+    - @logins.each do |l|
+      %tr{class: cycle('info-even','info-odd')}
+        %td= l[:login]
+        %td= l[:full_name]
+        %td= l[:count]
+        %td= l[:min] ? l[:min].in_time_zone.strftime('%Y-%m-%d %H:%M') : ''
+        %td= l[:max] ? l[:max].in_time_zone.strftime('%Y-%m-%d %H:%M') : ''
+      
diff --git a/app/views/report/submission_stat.html.haml b/app/views/report/submission_stat.html.haml
new file mode 100644
--- /dev/null
+++ b/app/views/report/submission_stat.html.haml
@@ -0,0 +1,41 @@
+- content_for :header do
+  = javascript_include_tag 'new'
+
+%script{:type=>"text/javascript"}
+  $(function () {
+  $('#since_datetime').datetimepicker({ showButtonPanel: true, dateFormat: "yy-mm-dd", controlType: "slider"} );
+  $('#until_datetime').datetimepicker({ showButtonPanel: true, dateFormat: "yy-mm-dd", controlType: "slider"} );
+  });
+
+
+%h1 Login status
+
+
+
+
+=render partial: 'report_menu'
+=render partial: 'date_range', locals: {param_text: 'Submission date range:', title: 'Query submission stat in the range'  }
+
+%table.info
+  %thead
+    %tr.info-head
+      %th login
+      %th full name
+      %th total submissions
+      %th submissions
+  %tbody
+    - @submissions.each do |user_id,data|
+      %tr{class: cycle('info-even','info-odd')}
+        %td= data[:login]
+        %td= data[:full_name]
+        %td= data[:count]
+        %td
+          - data[:sub].each do |prob_id,sub_data|
+            = "#{sub_data[:prob_name]}: ["
+            - st = []
+            - sub_data[:sub_ids].each do |id|
+              - st << link_to(id, controller: 'graders' , action: 'submission', id: id)
+            = raw st.join ', '
+            = ']'
+            %br/
+
diff --git a/config/routes.rb b/config/routes.rb
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,4 +1,6 @@
 CafeGrader::Application.routes.draw do
+  get "report/login"
+
   resources :contests
 
   resources :announcements
diff --git a/db/migrate/20140826095949_create_logins.rb b/db/migrate/20140826095949_create_logins.rb
new file mode 100644
--- /dev/null
+++ b/db/migrate/20140826095949_create_logins.rb
@@ -0,0 +1,10 @@
+class CreateLogins < ActiveRecord::Migration
+  def change
+    create_table :logins do |t|
+      t.string :user_id
+      t.string :ip_address
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20140823031747) do
+ActiveRecord::Schema.define(:version => 20140826095949) do
 
   create_table "announcements", :force => true do |t|
     t.string   "author"
@@ -86,6 +86,13 @@
     t.string "common_ext"
   end
 
+  create_table "logins", :force => true do |t|
+    t.string   "user_id"
+    t.string   "ip_address"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+  end
+
   create_table "messages", :force => true do |t|
     t.integer  "sender_id"
     t.integer  "receiver_id"
diff --git a/lib/grader_script.rb b/lib/grader_script.rb
--- a/lib/grader_script.rb
+++ b/lib/grader_script.rb
@@ -50,7 +50,7 @@
 
       Dir.chdir(cur_dir)
       
-      return output
+      return "import CMD: #{cmd}\n" + output
     end
     return ''
   end
diff --git a/lib/testdata_importer.rb b/lib/testdata_importer.rb
--- a/lib/testdata_importer.rb
+++ b/lib/testdata_importer.rb
@@ -11,6 +11,7 @@
   def import_from_file(tempfile, 
                        time_limit, 
                        memory_limit,
+                       checker_name='text',
                        import_to_db=false)
 
     dirname = extract(tempfile)
@@ -19,7 +20,8 @@
       @log_msg = GraderScript.call_import_problem(@problem.name,
                                                   dirname,
                                                   time_limit,
-                                                  memory_limit)
+                                                  memory_limit,
+                                                  checker_name)
     else
       # Import test data to test pairs.
 
diff --git a/spec/models/login_spec.rb b/spec/models/login_spec.rb
new file mode 100644
--- /dev/null
+++ b/spec/models/login_spec.rb
@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe Login do
+  pending "add some examples to (or delete) #{__FILE__}"
+end