Submission #1087918

#	Time	Username	Problem	Language	Result	Execution time	Memory
1087918		LOLOLO	The Kingdom of JOIOI (JOI17_joioi)	C++14	100 / 100	1968 ms	118068 KiB

joioi

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

#define           f     first
#define           s     second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (int)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())

const int N = 3e6 + 100;
int n, m, mn = 1e9, mx = 0;
vector < vector <int>> a, b, c, d;

bool check(int lim, vector < vector <int>> &a) {
    vector < vector <int>> val(n + 1, vector <int> (m + 1, 0));
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            if (a[i][j] - mn <= lim) {
                val[i][j]++;
            }

            if (mx - a[i][j] <= lim) {
                val[i][j] += 2;
            }

            if (val[i][j] == 0)
                return 0;
        }
    }

    int lst = 0, cur = m;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= cur; j++) {
            if (val[i][j] == 3 || val[i][j] == lst) 
                continue;

            if (lst == 0) {
                lst = val[i][j];
            } else {
                cur = j - 1;
                break;
            }
        }

        for (int j = cur + 1; j <= m; j++) {
            if (val[i][j] != 3 && val[i][j] == lst)
                return 0;
        }
    }

    return 1;
}

void solve() {
    cin >> n >> m;
    a.assign(n + 1, vector <int> (m + 1));

    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cin >> a[i][j];
            mn = min(mn, a[i][j]);
            mx = max(mx, a[i][j]);
        }
    }

    b = a, c = a;

    for (int i = 1; i <= n / 2; i++) {
        swap(b[i], b[n - i + 1]);
    }

    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m / 2; j++) {
            swap(c[i][j], c[i][m - j + 1]);
        }
    }

    d = c;
    for (int i = 1; i <= n / 2; i++) {
        swap(d[i], d[n - i + 1]);
    }

    int l = 0, r = mx, m, ans = mx - mn;
    while (l <= r) {
        m = (l + r) / 2;
        if (check(m, a) || check(m, b) || check(m, c) || check(m, d)) {
            ans = m;
            r = m - 1;
        } else {
            l = m + 1;
        }
    }

    cout << ans << '\n';
}


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    
    int t = 1;
    //cin >> t;

    while (t--) {
        solve();
        //cout << solve() << '\n';
    }
}

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