제출 #1134118

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1134118		tuongll	K blocks (IZhO14_blocks)	C++20	100 / 100	101 ms	1908 KiB

blocks

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <iostream>
#include <cstring>
#include <algorithm>
#include <vector>
#include <utility>
#include <cmath>
#include <ctime>
#include <cassert>
#include <set>
#include <stack>
#include <map>
#include <queue>
#include <random>
#include <chrono>
#include <bitset>
#include <array>
using ll = long long;
#define debug(x) cout << #x << " = " << x << '\n'
#define separator "===============================================\n"
#define all(a) a.begin(), a.end()
#define SZ(a) (int)(a).size()
using namespace std;
const int mxn = 1e5 + 3;
const ll  mod = 1e9 + 7;
const int inf32 = 2e9;
const ll  inf64 = 3e18;
void solve(){
    int n, k;
    cin >> n >> k;
    vector<int> a(n + 1);
    for (int i = 1; i <= n; ++i)
        cin >> a[i];
    vector<int> dp(n + 1), new_dp(n + 1, inf32);
    for (int i = 1; i <= n; ++i)
        dp[i] = max(dp[i - 1], a[i]);
    for (int j = 2; j <= k; ++j){
        stack<pair<int, int>> st;
        for (int i = j; i <= n; ++i){
            int best = dp[i - 1];
            while(!st.empty() && st.top().first <= a[i]){
                best = min(best, st.top().second);
                st.pop();
            }
            if (st.empty() || a[i] + best < st.top().first + st.top().second)
                st.emplace(a[i], best);
            new_dp[i] = st.top().first + st.top().second;
        }
        swap(dp, new_dp);
    }
    cout << dp[n];
}
int main(){
	auto start = chrono::steady_clock::now();
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t = 1;
    // cin >> t;
    while(t--) solve();
    chrono::duration<double> elapsed {chrono::steady_clock::now() - start};
    cerr << "\n>> Runtime: " << elapsed.count() << "s\n";
}

• Subtask 1: 14 / 14
• Subtask 2: 18 / 18
• Subtask 3: 21 / 21
• Subtask 4: 47 / 47