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Codeforces Round #799 (Div. 4) (E. Binary Deque)



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;

///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()
{
    ios_base :: sync_with_stdio(false);
    cin.tie(nullptr);
    ll tst,n,k;
    cin>>tst;
    while(tst--)
    {
        cin>>n>>k;
        ll sum=0,arr[n+7],sol,pro;
        for(ll i=1; i<=n; i++)
            cin>>arr[i],sum+=arr[i];
        if(sum>k)
        {
            ll ans[n+9],pos=1,cnt=0,k1=sum-k;
            ans[0]=0;
             for(ll i=1;i<=n && k1!=0;i++)
                if(arr[i]) ans[pos++]=i,k1--;
            sol=ans[pos-1],pro=pos-1;
            for(ll i=n;i>=1;i--)
            {
                cnt++;
                if(arr[i])
                {
                    sol=min(sol,cnt+ans[pro-1]);
                    pro--;
                    if(pro==0) break;
                }
            }
            cout<<sol<<endl;
        }
        else if(sum==k) cout<<"0"<<endl;
        else cout<<"-1"<<endl;
    }
    return 0;
}
///Alhamdulillah

Problem Link: https://codeforces.com/contest/1692/problem/E
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