/ C++ includes used for precompiling -*- C++ -*-
    2
    3 // Copyright (C) 2003-2013 Free Software Foundation, Inc.
    4 //
    5 // This file is part of the GNU ISO C++ Library.  This library is free
    6 // software; you can redistribute it and/or modify it under the
    7 // terms of the GNU General Public License as published by the
    8 // Free Software Foundation; either version 3, or (at your option)
    9 // any later version.
#include <bits/stdc++.h>
using namespace std;

int main()
{
    map<int, int>m;
    int n, k;
    cin>>n>>k;
    int a[n];
    for(int i = 0; i < n; i++){
        cin>>a[i];
    }
    for(int i = 0; i < k; i++){
        m[a[i]]++;
    }
    int l = 0, r = k - 1;
    while(r < n){
        cout<<m.begin()->first<<" ";
        r++;
        m[a[r]]++;
        m[a[l]]--;
        if(m[a[l]] == 0){
            m.erase(a[l]);
        }
        l++;
    }
}

RAW Paste Data

#include <bits/stdc++.h>
using namespace std;

int main()
{
    map<int, int>m;
    int n, k;
    cin>>n>>k;
    int a[n];
    for(int i = 0; i < n; i++){
        cin>>a[i];
    }
    for(int i = 0; i < k; i++){
        m[a[i]]++;
    }
    int l = 0, r = k - 1;
    while(r < n){
        cout<<m.begin()->first<<" ";
        r++;
        m[a[r]]++;
        m[a[l]]--;
        if(m[a[l]] == 0){
            m.erase(a[l]);
        }
        l++;
    }
}

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