Submission #971536

#	Time	Username	Problem	Language	Result	Execution time	Memory
971536		CyberCow	The short shank; Redemption (BOI21_prison)	C++17	55 / 100	2051 ms	12884 KiB

prison

#include <random>
#include <algorithm>
#include <bitset>
#include <chrono>
#include <cmath>
#include <deque>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <chrono>
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((x).size())
typedef long long ll;
using ull = unsigned long long;
using namespace std;
mt19937 rnd(348502);
ll mod1 = 998244353;
ll mod = 1e9 + 7;
const ll N = 500010;

int a[N], lr[N];
int han[N];
int ans[N];
int achqisjoga[N];

void solve()
{
    int n, d, k, t;
    cin >> n >> d >> t;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        if (a[i] <= t)
            lr[i] = min(t - a[i] + i, n);
    }
    int obshi = 0;
    int ma = 0, qaq = 0;
    for (int h = 0; h < d; h++)
    {
        obshi = 0;
        stack<pair<int, int>> se;
        for (int i = 1; i <= n; i++)
        {
            se.push({ i, lr[i] });
            while (!se.empty() && se.top().second < i)
            {
                se.pop();
            }
            if (!se.empty())
            {
                han[i] = se.top().first;
                achqisjoga[se.top().first]++;
                achqisjoga[i]--;
                obshi++;
            }
        }
        ma = 0, qaq = 0;
        int hanind = 0;
        for (int i = 1; i <= n; i++)
        {
            qaq += achqisjoga[i];
            if (ma < qaq)
            {
                ma = max(ma, qaq);
                hanind = i;
            }
        }
        for (int hh = 0; hh <= hanind; hh++)
        {
            lr[hh] = min(lr[hh], hanind);
        }
        for (int hh = 0; hh <= N; hh++)
        {
            achqisjoga[hh] = 0;
        }
    }
    cout << obshi - ma;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int tt = 1;
    //cin >> tt;
    while (tt--) {
        solve();
    }
    return 0;
}

Compilation message (stderr)

prison.cpp: In function 'void solve()':
prison.cpp:38:15: warning: unused variable 'k' [-Wunused-variable]
   38 |     int n, d, k, t;
      |               ^
prison.cpp:84:28: warning: iteration 500010 invokes undefined behavior [-Waggressive-loop-optimizations]
   84 |             achqisjoga[hh] = 0;
      |             ~~~~~~~~~~~~~~~^~~
prison.cpp:82:29: note: within this loop
   82 |         for (int hh = 0; hh <= N; hh++)
      |                          ~~~^~~~
prison.cpp:84:28: warning: 'void* __builtin_memset(void*, int, long unsigned int)' forming offset [2000040, 2000043] is out of the bounds [0, 2000040] of object 'achqisjoga' with type 'int [500010]' [-Warray-bounds]
   84 |             achqisjoga[hh] = 0;
      |             ~~~~~~~~~~~~~~~^~~
prison.cpp:34:5: note: 'achqisjoga' declared here
   34 | int achqisjoga[N];
      |     ^~~~~~~~~~

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