Submission #1272972

#	Time	Username	Problem	Language	Result	Execution time	Memory
1272972		trvhung	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	0 / 100	1 ms	572 KiB

Main

#include <bits/stdc++.h>
// #include <ext/rope>
// #include <ext/pb_ds/assoc_container.hpp>

// using namespace __gnu_pbds;
// using namespace __gnu_cxx;
using namespace std;

// #define   ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define            ll long long
#define           ull unsigned long long
#define            ld long double
#define            pb push_back
#define  bit(mask, i) ((mask >> i) & 1)
#define            el '\n'
#define             F first
#define             S second

template <class X, class Y> bool maximize(X &x, const Y &y) { return (x < y ? x = y, 1 : 0); }
template <class X, class Y> bool minimize(X &x, const Y &y) { return (x > y ? x = y, 1 : 0); }

const int INF = 1e9;
const ll LINF = 1e18;
const int MOD = 1e9 + 7;
const int MULTI = 0;
const ld eps = 1e-9;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {1, 0, -1, 0}; // R D L U
const int ddx[4] = {-1, 1, 1, -1}, ddy[4] = {1, 1, -1, -1}; // UR DR DL UL
const char cx[4] = {'R', 'D', 'L', 'U'};
const ll base = 31;
const int nMOD = 2;
const ll mods[] = {(ll)1e9 + 10777, (ll)1e9 + 19777, (ll)1e9 + 3, (ll)1e9 + 3777};

const int N = 2e5 + 5;
int n, a[N];
ll pref[N], suf[N], sufDiff[N];

void solve() {
	cin >> n;
	for (int i = 1; i <= n; ++i)
		cin >> a[i];
	
	int lst = 0;
	for (int i = 1; i <= n; ++i) {
		pref[i] = pref[i - 1];
		if (a[i] > lst)
			lst = a[i];
		else {
			lst++;
			pref[i] += lst - a[i];
		}
	}

	lst = 0;
	for (int i = n; i >= 1; --i) {
		suf[i] = suf[i + 1];
		if (a[i] > lst)
			lst = a[i];
		else {
			lst++;
			suf[i] += lst - a[i];
		}
	}

	for (int i = n - 1; i >= 1; --i)
		sufDiff[i] = sufDiff[i + 1] + max(0LL, (suf[i + 1] - suf[i + 2]) - (suf[i] - suf[i + 1]));

	ll res = min(pref[n], suf[1]);
	for (int i = 2; i < n; ++i) {
		ll cur = pref[i - 1];
		int h = max(pref[i] - pref[i - 1], suf[i] - suf[i + 1]);

		int pr = pref[i - 1] - pref[i - 2];
		cur += max(0, h - pr);

		maximize(h, pr);
		pr = suf[i + 1] - suf[i + 2];
		cur += max(0, pr - h);

		cur += sufDiff[i + 1];
		minimize(res, cur);
	}

	cout << res;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    if (!MULTI) solve();
    else {
        int test; cin >> test;
        while (test--) solve();
    }
    
    return 0;
}

• Subtask 1: 0 / 40
• Subtask 2: 0 / 60