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//#include <iostream>
#include <stdio.h>
#include <map>
#include <cstring>

using namespace std;

struct ltstr
{
  bool operator()(const char* s1, const char* s2) const
  {
    return strcmp(s1, s2) < 0;
  }
};

int main()
{
  map<const char*, int, ltstr> months;
  
  months["january"] = 31;
  months["february"] = 28;
  months["march"] = 31;
  months["april"] = 30;
  months["may"] = 31;
  months["june"] = 30;
  months["july"] = 31;
  months["august"] = 31;
  months["september"] = 30;
  months["october"] = 31;
  months["november"] = 30;
  months["december"] = 31;
  
  //cout << "june -> " << months["june"] << endl;
  printf("june -> %d\n", months["june"]);
  map<const char*, int, ltstr>::iterator cur  = months.find("june");
  map<const char*, int, ltstr>::iterator prev = cur;
  map<const char*, int, ltstr>::iterator next = cur;    
  ++next;
  --prev;
  //cout << "Previous (in alphabetical order) is " << (*prev).first << endl;
  //cout << "Next (in alphabetical order) is " << (*next).first << endl;
  printf("Previous (in alphabetical order) is %s\n", (*prev).first);
  printf("Next (in alphabetical order) is %s\n", (*next).first);
}