Submission #1056886

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056886		Zbyszek99	The short shank; Redemption (BOI21_prison)	C++17	10 / 100	106 ms	29668 KiB

prison

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define size(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace std;
//mt19937 mt;void random(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll rand(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

void solve()
{
    int n,d,t;
    cin >> n >> d >> t;
    vector<int> v(n);
    rep(i,n) cin >> v[i];
    vector<int> ans_pref(n);
    vector<int> ans_suf(n+1,0);
    int max_end = -1;
    int ans = 0;
    rep(i,n)
    {
        if(v[i] <= t)
        {
            max_end = max(max_end,i + t-v[i]);
        }
        if(i <= max_end)
        {
            ans++;
        }
        ans_pref[i] = ans;
    }
    reverse(all(v));
    ans = 0;
    int pop = -1;
    set<int> untake;
    rep(i,n)
    {
        if(v[i] <= t)
        {
            int odl = t-v[i];
            ans++;
         //   if(size(untake) != 0) cout << *untake.begin() << " untake\n";
            while(size(untake) != 0 && -(*untake.begin()) >= i - odl)
            {
                ans++;
                untake.erase(untake.begin());
            }
            ans_suf[n-i-1] = ans;
        }
        else 
        {
            ans_suf[n-i-1] = ans;
            untake.insert(-i);
        }
    }
    int ans_ = n;
    rep(i,n)
    {
        //cout << ans_pref[i] << " " << ans_suf[i] << " ans\n";
        if(i == n-1)
        {
            ans_ = min(ans_,ans_pref[n-1]);
        }
        else ans_ = min(ans_,ans_pref[i]+ans_suf[i+1]);
    }
    cout << ans_ << "\n";
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random();
    int t = 1;
    //cin >> t;
    while(t--) solve();
}

Compilation message (stderr)

prison.cpp: In function 'void solve()':
prison.cpp:47:9: warning: unused variable 'pop' [-Wunused-variable]
   47 |     int pop = -1;
      |         ^~~

• Subtask 1: 0 / 15
• Subtask 2: 10 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 25
• Subtask 6: 0 / 20