Submission #413334

#	Time	Username	Problem	Language	Result	Execution time	Memory
413334		egorlifar	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	71 ms	4608 KiB

Main

/*
KAMUI!
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*/
#include <iostream>
#include <complex>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <numeric>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <cmath>
#include <bitset>
#include <cassert>
#include <queue>
#include <stack>
#include <deque>
#include <random>
 
using namespace std;
template<typename T1, typename T2> inline void chkmin(T1 &a, T2 b) {if (a > b) a = b;}
template<typename T1, typename T2> inline void chkmax(T1 &a, T2 b) {if (a < b) a = b;}
#define files(FILENAME) read(FILENAME); write(FILENAME)
#define read(FILENAME) freopen((FILENAME + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((FILENAME + ".out").c_str(), "w", stdout)
#define all(c) (c).begin(), (c).end()
#define sz(c) (int)(c).size()
#define left left228
#define right right228
#define y1 y1228
#define mp make_pair
#define pb push_back
#define y2 y2228
#define rank rank228
using ll = long long;
using ld = long double; 
const string FILENAME = "input";
const int Mod = 1000000007;


int sum(int a, int b) {
    return (a + b >= Mod ? a + b - Mod: a + b);
}


int mul(int a, int b) {
    return ((ll)a * b) % Mod;
}


int powm(int a, int b) {
    int res = 1;
    while (b) {
        if (b & 1) {
            res = mul(res, a);
        }
        a = mul(a, a);
        b >>= 1;
    }
    return res;
}


int inv(int a) {
    return powm(a, Mod - 2);
}



const int MAXN = 200229;


int n;
int a[MAXN];
ll pref[MAXN];


void solve() {
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    ll cur = 0;
    for (int i = 0; i < n; i++) {
        pref[i] = cur;
        cur += max(0, a[i] - a[i + 1] + 1);
    }   
    ll cur1 = 0;
    ll ans = 1e18;
    for (int i = n - 1; i >= 0; i--) {
        cur1 += max(0, a[i + 1] - a[i] + 1);
        chkmin(ans, max(pref[i], cur1));
    }
    cout << ans << '\n';
}
//21:50


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
   // read(FILENAME);
    int t;
    t = 1;
  //  cin >> t;
    while (t--) {
        solve();
    }
    return 0;
}
 

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