Submission #1277840

#	Time	Username	Problem	Language	Result	Execution time	Memory
1277840		ducdev	Discharging (NOI20_discharging)	C++17	9 / 100	1097 ms	4896 KiB

Discharging

// Author: 4uckd3v - Nguyen Cao Duc
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

const int MAX_N = 1e6;
const int MOD = 1e9 + 7;
const ll INF = 1e18;

int n;
int a[MAX_N + 5];
pair<ll, ll> dp[MAX_N + 5];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if (fopen("MAIN.INP", "r")) {
        freopen("MAIN.INP", "r", stdin);
        freopen("MAIN.OUT", "w", stdout);
    };

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

    for (int i = 1; i <= n; i++) {
        dp[i].first = dp[i].second = INF;
        int mx = 0;
        for (int j = i; j >= 1; j--) {
            mx = max(mx, a[j]);
            dp[i] = min(dp[i], {dp[j - 1].first + (dp[j - 1].second + mx) * (i - j + 1),
                                (dp[j - 1].second + mx)});
        };
    };

    cout << dp[n].first << '\n';
};

Compilation message (stderr)

Discharging.cpp: In function 'int main()':
Discharging.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen("MAIN.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Discharging.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen("MAIN.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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