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Codeforces round 1100(B. Build a Contest)

///Bismillahir Rahmanir Rahim
///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

int main()
{
    ll n,m,num;
    cin>>n>>m;
    vector<ll>vec[n+5];
    ll vis[m+2],pq,sz=m;

    for(ll i=1; i<=m; i++)
        cin>>num,vec[num].push_back(i),vis[i]=0;

    for(ll i=1; i<=n; i++)
        pq=vec[i].size(),sz=min(sz,pq);
    for(ll i=0; i<sz; i++)
    {
        ll fi=-1;
        for(ll j=1; j<=n; j++)
            pq=vec[j][i],fi=max(fi,pq);
        vis[fi]=1;
    }
    for(ll i=1;i<=m;i++) cout<<vis[i];
    cout<<endl;
    return 0;
}
///Alhamdulillah

Problem Link:https://codeforces.com/problemset/problem/1100/B

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