Submission #878987

#	Time	Username	Problem	Language	Result	Execution time	Memory
878987		frostray8653	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	21 ms	8688 KiB

Main

#include <bits/stdc++.h>
#define int long long
#define IO ios::sync_with_stdio(0), cin.tie(0);
#define FOR(i, a, b) for (int i = a; i <= b; i++)
using namespace std;
using pii = pair<int, int>;
void dbg() {;}
template<class T, class ...U>
void dbg(T a, U ...b) { cout << a << " "; dbg(b...); }
void ent() { cout << "\n"; }
const int INF = 1e16;
const int N = 200005;

int a[N], b[N];
int dx[2][N];

signed main() {
    IO;
    int n;
    cin >> n;
    FOR(i, 1, n) cin >> a[i];
    FOR(i, 2, n) b[i] = a[i] - a[i - 1];
    FOR(i, 2, n) {
        if (b[i] <= 0)
            dx[0][i] = 1 - b[i];
        if (b[i] >= 0)
            dx[1][i] = b[i] - (- 1);
        dx[0][i] += dx[0][i - 1];
        dx[1][i] += dx[1][i - 1];
    }

    int ans = INF;
    FOR(i, 1, n) {
        int pre = dx[0][i];
        int suf = dx[1][n] - dx[1][i];
        ans = min(ans, max(pre, suf));
    }
    cout << ans << "\n";
    return 0;
}

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