To find duplicate entry in c++ using 2D Vector (std::vector) -


i wrote program find duplicate entry in table. beginner in c++, hence don't know how program working efficient. there other idea write program? here have 3 tables (2d vector), 1)arecord_arr 2)maintable , 3)idxtable. idxtable use identify keys check duplicate entry. arecord_arr table add in maintable. if exist in maintable, show error "duplicate entry". check program, , give suggestions. 

typedef vector<string> rec_t; typedef vector<rec_t> tab_t; typedef vector<int> cn_t; int main() {     tab_t arecord_arr=  { {"a","apple","fruit"},                           {"b","banana","fruit"} };      tab_t maintable =   { {"o","orange","fruit"},                           {"p","pineapple","fruit"},                           {"b","banana","fruit"},                           {"m","melon","fruit"},                           {"a","apple","fruit"},                           {"g","guava","fruit"} };      tab_t idxtable = { {"code","k"},                        {"name","k"},                        {"category","n"}};      size_t num_arecords = arecord_arr.size();     int idxsize = idxtable.size();     int mainsize = maintable.size();      rec_t r1;     rec_t r2;     tab_t t1,t2;     cn_t idx;      for(int i=0;i<idxsize;i++)     {         if(idxtable[i][1]=="k")         {             idx.push_back(i);                        }     }      for(size_t j=0;j<num_arecords;j++)     {         for(unsigned int id=0;id<idx.size();id++)         {             r1.push_back(arecord_arr[j][idx[id]]);         }         t1.push_back(std::move(r1));     }      for(int j=0;j<mainsize;j++)     {         for(unsigned int id=0;id<idx.size();id++)         {             r2.push_back(maintable[j][idx[id]]);         }         t2.push_back(std::move(r2));     }      for(size_t i=0;i<t1.size();i++)     {         for(size_t j=0;j<t2.size();j++)         {             if(t1[i]==t2[j])             {                 cout<<"duplicate entry"<<endl;                 exit(0);             }         }      } }

if want avoid duplicate entries in array, should consider using std::setinstead.


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