Submission #681812

#	Time	Username	Problem	Language	Result	Execution time	Memory
681812		abysmal	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	0 / 100	1 ms	332 KiB

Main

#include<iostream>
#include<stdio.h>
#include<stdint.h>
#include<vector>
#include<algorithm>
#include<utility>
#include<set>
#include<map>
#include<queue>
#include<stack>
#include<deque>
#include<string>
#include<assert.h>

using namespace std;

const int64_t INF = (int64_t) 1e9 + 5;
const int64_t mINF = 1e6 + 1;
const int64_t MOD = (int64_t) 1e9 + 7;
const int nbit = 30;
const int ndig = 10;
const int nchar = 26;
const int p1 = 31;
const int p2 = 53;
const int D = 4;
int dr[D] = {0, 1, 0, -1};
int dc[D] = {1, 0, -1, 0};
// 0 right // 1 down // 2 left // 3 up

struct Solution
{
    int n;
    vector<int> a;
    Solution() {}

    void solve()
    {
        cin >> n;
        a.resize(n);

        for(int i = 0; i < n; i++)
        {
            cin >> a[i];
        }

        vector<int> prefix(n, 0);
        vector<int> suffix(n, 0);

        int max_ = a[0];
        for(int i = 0; i < n; i++)
        {
            int tmp = 0;
            if(i != 0) tmp = prefix[i - 1];
            int need = max_ - (a[i] + tmp);

            prefix[i] += tmp;

            if(need > 0) prefix[i] += need;
            max_ = max(max_, a[i] + tmp) + 1;
        }

        max_ = a[n - 1];
        for(int i = n - 1; i >= 0; i--)
        {
            int tmp = 0;
            if(i != n - 1) tmp = suffix[i + 1];
            int need = max_ - (a[i] + tmp);
            suffix[i] = tmp;

            if(need > 0) suffix[i] += need;
            max_ = max(max_, a[i] + tmp) + 1;
        }

        int ans = INF;
        for(int i = 0; i < n; i++)
        {
            ans = min(ans, max(prefix[i], suffix[i]));
        }

        cout << ans << "\n";
    }

    int modsub(int t1, int t2)
    {
        int res = t1 - t2;
        if(res < 0) res += MOD;

        return res;
    }

    int modadd(int t1, int t2)
    {
        int res = t1 + t2;
        if(res >= MOD) res -= MOD;

        return res;
    }

    int modmul(int t1, int t2)
    {
        int64_t res = 1LL * t1 * t2;
        return (res % MOD);
    }

    bool BIT(int64_t& mask, int& j)
    {
        return (mask & MASK(j));
    }

    int64_t MASK(int j)
    {
        return (1LL << j);
    }
};

void __startup()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

//    freopen("in.txt", "r", stdin);
//    freopen("out.txt", "w", stdout);
}

int main()
{
    __startup();
    int t = 1;
//    cin >> t;

    for(int i = 1; i <= t; i++)
    {
        Solution().solve();
    }

    return 0;
}

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