Submission #1125301

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125301		Tsagana	K blocks (IZhO14_blocks)	C++20	0 / 100	1 ms	328 KiB

blocks

#include<bits/stdc++.h>

#define IOS ios_base::sync_with_stdio(false);cin.tie();cout.tie();
#define all(x) x.begin(), x.end()
#define int long long
#define pq priority_queue
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define pp pop_back
#define F first
#define S second

using namespace std;

int n, k, mx;
int a[100001];
int dp[100001][101];

void solve () {
	cin >> n >> k;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		mx = max(mx, a[i]);
		dp[i][1] = mx;
	}
	
	for (int i = 2; i <= k; i++) {
		stack<pair<int, int>> s;
		
		for (int j = 1; j <= n; j++) {
			dp[j][i] = 1e9;
			if (j < i) continue ;

			int mn = dp[j-1][i-1];
			while (!s.empty() && a[s.top().S] <= a[n]) {mn = min(mn, s.top().F); s.pop();}
			
			if (!s.empty()) dp[j][i] = dp[s.top().S][i];
			dp[j][i] = min(dp[j][i], mn + a[j]);

			s.push({mn, j});
		}
	}

	cout << dp[n][k];
}
signed main() {IOS solve(); return 0;}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47