Adventofcode/DAY1.cpp at main · Saketh1100/Adventofcode · GitHub

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#include<iostream>
#include<fstream>
#include<vector>

using namespace std;
int main()
{

    fstream indata;
    indata.open("day1data");
    vector<int>v;
    int p;
    if(indata.fail())
    {
        cout<<"some thing is wrong";
    }
    while(indata>>p)
    {
        v.push_back(p);
    }

    sort(v.begin(),v.end());

    int j=v.size()-1;
    int i=0;


     while(i<j)
   {
       if(v[i]+v[j]==2020)
       {

           break;
       }
       else if(v[i]+v[j]<2020)
      {
          i++;

       }
       else if (v[i] + v[j] > 2020)
       {
           j--;
       }
     }

    cout<<(v[i]*v[j])<<endl;
    indata.close();


    return 0;
}