diff --git a/3.3.cpp b/3.3.cpp
new file mode 100644
index 0000000..6beeaf2
--- /dev/null
+++ b/3.3.cpp
@@ -0,0 +1,116 @@
+#include "MySQLWrapper.h"
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <map>
+#include <set>
+#include <cstdlib>
+#include <cstdio>
+#include <cstring>
+#include <algorithm>
+#include <fstream>
+using namespace std;
+
+#include "local_db_account.h"
+#include "util.hpp"
+
+int main()
+{
+    /// 3.3 大数据岗位需求量前十个
+
+    MySQLConn conn;
+    conn.connect("127.0.0.1",db_user,db_passwd,"bigdata3",3306);
+    cout<<"Connected to DB"<<endl;
+    conn.exec("set names gbk",nullptr);
+
+    auto fn1=[](map<string,vector<int>>& mp)
+    {
+        for(auto iter=mp.begin(); iter!=mp.end(); )
+        {
+            bool updated=false;
+            for(auto xiter=mp.begin(); xiter!=iter; )
+            {
+                if(iter->first.find(xiter->first)!=string::npos)
+                {
+                    /// Found something?
+                    /// targetvec.push_back(thisvec) : Add current vector to the previous vector.
+                    xiter->second.insert(xiter->second.end(),
+                    iter->second.begin(),iter->second.end());
+
+
+                    /// iter should now be deleted. Get next iter first
+                    auto nowiter=iter;
+                    ++iter;
+                    mp.erase(nowiter);
+
+                    /// Stop internal loop.
+                    updated=true;
+                    break;
+                }
+                else ++xiter;
+            }
+
+            if(!updated) ++iter;
+        }
+
+        for(auto& pr:mp)
+        {
+            int sum=0;
+            int n=pr.second.size();
+            for(int i=0; i<n; i++)
+            {
+                sum+=pr.second[i];
+            }
+            pr.second[0]=sum;
+        }
+
+    };
+
+    /// title, vector<int>
+    map<string,vector<int>> dmp;
+
+    conn.exec("use bigdata3",nullptr);
+    conn.exec("select title,count(*) as want_num from lagou_job where ((title like '%大数据%' ) or ( tags like '%大数据%')) group by title order by want_num desc",[&](MySQLResult& res)
+              {
+                  res.stepRow([&](char** val,unsigned long* len)
+                              {
+                                  string title(val[0]);
+                                  int cc=ParseInt(val[1]);
+                                  dmp[Trim(title)].push_back(cc);
+                              });
+              });
+
+    conn.exec("use bigdata5",nullptr);
+    conn.exec("select title,count(*) as want_num from pages where ((title like '%大数据%' ) or ( tags like '%大数据%')) group by title order by want_num desc",[&](MySQLResult& res)
+              {
+                  res.stepRow([&](char** val,unsigned long* len)
+                              {
+                                  string city(val[0]);
+                                  int cc=ParseInt(val[1]);
+                                  dmp[Trim(city)].push_back(cc);
+                              });
+              });
+
+    fn1(dmp);
+
+    vector<pair<string,int>> vec;
+    for(const auto& pr:dmp)
+    {
+        vec.push_back(make_pair(pr.first,pr.second[0]));
+    }
+    sort(vec.begin(),vec.end(),[](const pair<string,int>& a,const pair<string,int>& b)
+         {
+             return a.second > b.second;
+         });
+
+    ofstream ofs("result/3.3.csv");
+    #define cout ofs
+    int szLoop=min(10u,vec.size());
+    for(int i=0;i<szLoop;i++)
+    {
+        cout<<vec[i].first<<","<<vec[i].second<<endl;
+    }
+    #undef cout
+
+    return 0;
+}