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I have the following data as input (sorted by first column): foo 1 2 foo 3 3 bar 10 11 I want to create a Map of Vector with first column as key of the map such that we have: foo = {1,2,3,3} bar = {10,11} But why my code below doesn't work as expected? #include <vector> #include <map> #include <iostream> #include <fstream> #include <sstream> using namespace std; int main ( int arg_count, char *arg_vec[] ) { if (arg_count !=2 ) { cerr << "expected one argument" << endl; return EXIT_FAILURE; } string line; ifstream acemblyfile (arg_vec[1]); map <string, vector<int> > myMapOfVec; vector <string> myVec; string KEY = "" ; if (acemblyfile.is_open()) { while (getline(acemblyfile,line) ) { stringstream ss(line); string KEY_TEMP; int VAL1; int VAL2; ss >> KEY_TEMP >> VAL1 >> VAL2; MyVec.push_back(VAL1); MyVec.push_back(VAL2); if (KEY_TEMP != KEY) { myMapOfVec[KEY] = MyVec; KEY = KEY_TEMP; MyVec.clear(); } } acemblyfile.close(); } else { cout << "Unable to open file"; } for( map<string, vector<int> >::iterator iter = myMapOfVec.begin(); iter != myMapOfVec.end(); ++iter ) { vector <int> tempVec = (*iter).second; string Key = (*iter).first; for (unsigned i =0; i<tempVec.size(); i++) { cout << Key << " " << tempVec[i] << endl; } }

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