Submission #1056768

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056768		Zbyszek99	The short shank; Redemption (BOI21_prison)	C++17	0 / 100	0 ms	348 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;
    rep(i,n)
    {
        if(v[i] <= t)
        {
            int odl = v[i]-t;
            int a = 1;
            rep(j,odl)
            {
                if(v[i] > t)
                {
                    a++;
                }
                else 
                {
                    break;
                }
            }
            if(pop == -1) ans_suf[n-i-1] = a;
            else ans_suf[n-i-1] = a+ans_suf[pop];
            pop = n-i-1;
        }
        else ans_suf[n-i-1] = ans_suf[n-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();
}

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