Submission #320689

#	Time	Username	Problem	Language	Result	Execution time	Memory
320689		socho	Discharging (NOI20_discharging)	C++14	36 / 100	4 ms	620 KiB

Discharging

#include <bits/stdc++.h>
using namespace std;
void fast() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
}
void ran() {
	srand(chrono::steady_clock::now().time_since_epoch().count());
}
long long get_rand() {
	long long a = rand();
	long long b = rand();
	return a * (RAND_MAX + 1ll) + b;
}
void usaco() {
	freopen("problem.in", "r", stdin); 
	freopen("problem.out", "w", stdout);
}
template<typename T>
using min_pq = priority_queue<T, vector<T>, greater<T>>;
// #define endl '\n'
// #define double long double
#define int long long
// int MOD = 1000 * 1000 * 1000 + 7;
// int MOD = 998244353;

const int MXN = 1505;
int n;
int arr[MXN];
int dp[MXN];

signed main() {

	ran(); fast();

	cin >> n;
	for (int i=1; i<=n; i++) {
		cin >> arr[i];
		arr[i] = max(arr[i-1], arr[i]);
	}
	
	dp[0] = 0;
	for (int i=1; i<=n; i++) {
		dp[i] = LLONG_MAX;
		int al = 0;
		for (int j=i; j>=1; j--) {
			al = max(al, arr[j]);
			dp[i] = min(dp[i], (n - j + 1) * al + dp[j-1]);
		}
	}
	
	cout << dp[n] << endl;
	
	
	
}

Compilation message (stderr)

Discharging.cpp: In function 'void usaco()':
Discharging.cpp:15:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   15 |  freopen("problem.in", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Discharging.cpp:16:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  freopen("problem.out", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 0 / 25
• Subtask 4: 0 / 11
• Subtask 5: 14 / 14
• Subtask 6: 0 / 28