Submission #1256791

#	Time	Username	Problem	Language	Result	Execution time	Memory
1256791		tvgk	The Kingdom of JOIOI (JOI17_joioi)	C++20	100 / 100	2139 ms	90024 KiB

joioi

#include<bits/stdc++.h>
using namespace std;
#define task "a"
#define se second
#define fi first
#define ll long long
#define ii pair<ll, ll>
#define tp tuple<int, int, int>
const long mxN = 2e3 + 7, inf = 1e9 + 7;

int nRow, nCol, a[mxN][mxN], ctr[mxN];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(task".INP", "r", stdin);
    //freopen(task".OUT", "w", stdout);

    cin >> nRow >> nCol;
    int mxx = 0, mnn = inf;
    for (int i = 1; i <= nRow; i++)
    {
        for (int j = 1; j <= nCol; j++)
        {
            cin >> a[i][j];
            mxx = max(mxx, a[i][j]);
            mnn = min(a[i][j], mnn);
        }
    }

    int ans = inf;
    for (int k = 0; k < 4; k++)
    {
        vector<tp> point;
        for (int i = 1; i <= nRow; i++)
        {
            ctr[i] = 0;
            for (int j = 1; j <= nCol; j++)
                point.push_back({a[i][j], i, j});
        }
        sort(point.begin(), point.end());

        int mx = 0;
        for (int id = 0; id < point.size(); id++)
        {
            auto [val, i, j] = point[id];

            for (; i <= nRow; i++)
            {
                if (ctr[i] >= j)
                    break;

                while (ctr[i] < j)
                {
                    ctr[i]++;
                    mx = max(mx, a[i][ctr[i]]);
                }
            }

            if (ctr[1] == nCol)
                break;

            ans = min(ans, max(mx - mnn, mxx - get<0>(point[id + 1])));
        }

        if (k % 2)
        {
            for (int i = 1; i <= nRow / 2; i++)
            {
                for (int j = 1; j <= nCol; j++)
                    swap(a[i][j], a[nRow - i + 1][j]);
            }
        }
        else
        {
            for (int i = 1; i <= nRow; i++)
            {
                for (int j = 1; j <= nCol / 2; j++)
                    swap(a[i][j], a[i][nCol - j + 1]);
            }
        }
    }
    cout << ans;
}

• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 40 / 40