Submission #770919

#	Time	Username	Problem	Language	Result	Execution time	Memory
770919		dxz05	Rabbit Carrot (LMIO19_triusis)	C++17	63 / 100	206 ms	113812 KiB

triusis

#pragma GCC optimize("Ofast,O3,unroll-loops")
#pragma GCC target("avx,avx2")

#include <bits/stdc++.h>

using namespace std;

#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define bpc(x) __builtin_popcount(x)
#define bpcll(x) __builtin_popcountll(x)
#define MP make_pair
//#define endl '\n'

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

typedef long long ll;
const int MOD = 1e9 + 7;
const int N = 5005;

vector<pair<int, int>> dp[N];
int a[N];

void solve(){
    int n, k;
    cin >> n >> k;

    for (int i = 1; i <= n; i++) cin >> a[i];

    dp[0] = {MP(0, 0)};

    for (int i = 1; i <= n; i++){
        vector<int> v;
        for (auto now : dp[i - 1]) v.push_back(now.first + k);
        v.push_back(a[i]);

        int j = (int) v.size() - 1;
        while (j > 0 && v[j] < v[j - 1]){
            swap(v[j], v[j - 1]);
            j--;
        }

        v.erase(unique(all(v)), v.end());

        j = 0;
        for (int h : v){
            while (j < (int) dp[i - 1].size() && dp[i - 1][j].first < h - k) j++;

            if (j < (int) dp[i - 1].size()){
                dp[i].emplace_back(h, dp[i - 1][j].second + (a[i] != h));
            }
        }

        for (j = (int) dp[i].size() - 2; j >= 0; j--){
            dp[i][j].second = min(dp[i][j].second, dp[i][j + 1].second);
        }

    }

    cout << dp[n][0].second << endl;

}

int main(){
    clock_t startTime = clock();
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int test_cases = 1;
//    cin >> test_cases;

    for (int test = 1; test <= test_cases; test++){
        //cout << (solve() ? "YES" : "NO") << endl;
        solve();
    }

#ifdef LOCAL
    cerr << "Time: " << int((double) (clock() - startTime) / CLOCKS_PER_SEC * 1000) << " ms" << endl;
#endif

    return 0;
}

Compilation message (stderr)

triusis.cpp: In function 'int main()':
triusis.cpp:65:13: warning: unused variable 'startTime' [-Wunused-variable]
   65 |     clock_t startTime = clock();
      |             ^~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 28 / 28
• Subtask 4: 0 / 37