Submission #689682

#	Time	Username	Problem	Language	Result	Execution time	Memory
689682		zeroesandones	Discharging (NOI20_discharging)	C++17	9 / 100	1087 ms	23740 KiB

Discharging

#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef long double ld;
typedef vector<ll> vi;
typedef pair<ll, ll> pi;

#define FOR(i, j, k) for (ll i = j; i < (ll) k; ++i)
#define FORD(i, j, k) for (ll i = j; i >= (ll) k; --i)
#define nl "\n"
#define sp " "

#define all(x) (x).begin(), (x).end()
#define sc second
#define fr first
#define pb emplace_back

// Binary Search, maybe

void solve()
{
    ll n;
    cin >> n;

    ll t[n + 1];
    FOR(i, 1, n + 1)
        cin >> t[i];

    pi dp[n + 1] = {};
    // dp[i].fr = minimum time taken for the first i people
    // dp[i].sc = cumulative time taken per group for the first i people

    ll inf = 1e15;
    fill(dp, dp + n + 1, make_pair(inf, inf));

    dp[1] = {t[1], t[1]};
    dp[0] = {0, 0};
    FOR(i, 2, n + 1) {
        ll mx = 0;
        FORD(j, i, 1) {
            // [j .. i] is one group
            mx = max(mx, t[j]);
            pi curr;
            ll len = i - j + 1;
            curr.sc = mx + dp[j - 1].sc;
            curr.fr = len * (curr.sc) + dp[j - 1].fr;
            dp[i] = min(dp[i], curr);
        }
    }

    cout << dp[n].fr << nl;
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    ll t = 1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
}

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