제출 #747727

#제출 시각아이디문제언어결과실행 시간메모리
747727Sami_MassahGrowing Vegetables is Fun 4 (JOI21_ho_t1)C++17
100 / 100
36 ms10072 KiB
#include <bits/stdc++.h> using namespace std; const long long maxn = 2e5 + 12, inf = 1e17 ; long long n, a[maxn], sum[maxn][2], nat[maxn][2]; int main(){ ios_base::sync_with_stdio(false), cin.tie(0); cin >> n; for(int i = 0; i < n; i++) cin >> a[i + 1]; for(int i = 1; i <= n; i++){ sum[i][0] = sum[i - 1][0] + (a[i - 1] + 1 - a[i]) * (a[i - 1] + 1 - a[i] >= 0); nat[i][0] = max(nat[i - 1][0] + 1, a[i]); } for(int i = n; i >= 1; i--){ sum[i][1] = sum[i + 1][1] + (a[i + 1] + 1 - a[i]) * (a[i + 1] + 1 - a[i] >= 0); nat[i][1] = max(nat[i + 1][1] + 1, a[i]); } long long ans = inf; for(int i = 1; i <= n; i++){ long long mx = max(sum[i - 1][0], sum[i + 1][1]); long long s = sum[i + 1][1] + a[i + 1], f = sum[i - 1][0] + a[i - 1]; ans = min(ans, mx + max(max(f, s) + 1 - mx - a[i], 0ll)); // cout << i << ' ' << f << ' ' << s << ' ' << sum[i - 1][0] << ' ' << sum[i + 1][1] << endl; // cout << ans << endl; } cout << ans << endl; }
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