Submission #647626

#	Time	Username	Problem	Language	Result	Execution time	Memory
647626		cpLover22	K개의 묶음 (IZhO14_blocks)	C++17	100 / 100	317 ms	83824 KiB

blocks

#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
#define fi first
#define se second 
using ll = long long;
const int N = 1e5 + 5;
int n, nk, a[N]; 
namespace sub1 {
	const int N = 1e2 + 5, oo = 1e9 + 123;
	int dp[N][N];
	void sol() {
		for (int i = 0; i <= n; ++i)
			for (int j = 0; j <= nk; ++j)
				dp[i][j] = oo;
		dp[0][0] = 0;
		for (int i = 1; i <= n; ++i)
			for (int k = 1; k <= nk; ++k) {
				for (int j = i, mx = 0; j >= 1; --j) 
					mx = max(mx, a[j]), dp[i][k] = min(dp[i][k], dp[j - 1][k - 1] + mx);
			}
		cout << dp[n][nk];	
	}
}
namespace sub2 {
	struct state {
		ll fi, tr, se;
		state() {}
		state(ll fi, ll tr, ll se) : fi(fi), tr(tr), se(se) {}
	};
	const ll oo = 1e15;
	ll dp[N][105];
	void sol() {
		for (int i = 0; i <= n; ++i)
			for (int j = 0; j <= nk; ++j)
				dp[i][j] = oo;
		dp[0][0] = 0;
		for (int k = 1; k <= nk; ++k) {
			stack<state> que;
			a[k - 1] = 1e9; que.emplace(k - 1, dp[k - 1][k - 1], oo);
			for (int i = k; i <= n; ++i) {
				ll cur = oo, cur2 = oo;
				while (a[i] >= a[que.top().fi]) {
					cur = min(cur, que.top().tr + a[i]);
					cur2 = min(cur2, que.top().tr);
					que.pop();
				}
				cur = min(cur, min(que.top().se, dp[que.top().fi][k - 1] + a[i]));
				cur2 = min(cur2, dp[i][k - 1]);
				dp[i][k] = cur; que.emplace(i, cur2, cur);
			}
		}
		cout << dp[n][nk];
	}
}
int main() {
	cin.tie(0)->sync_with_stdio(0); cout.tie(0);
	if (fopen("Kblocks.inp", "r"))
	   freopen("Kblocks.inp", "r", stdin),
	   freopen("Kblocks.out", "w", stdout);
	cin >> n >> nk;
	for (int i = 1; i <= n; ++i) cin >> a[i];
	if (n <= 1e2) sub1::sol();
	else sub2::sol();
	return 0;
}
	   

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:59:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |     freopen("Kblocks.inp", "r", stdin),
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:60:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |     freopen("Kblocks.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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