Submission #260372

#	Time	Username	Problem	Language	Result	Execution time	Memory
260372		AM1648	The Kingdom of JOIOI (JOI17_joioi)	C++17	0 / 100	0 ms	384 KiB

joioi

/* be name khoda */

// #define long_enable
#include <iostream>
#include <algorithm>
#include <cstring>
#include <numeric>
#include <vector>
#include <fstream>
#include <set>
#include <map>
using namespace std;

#ifdef long_enable
typedef long long int ll;
#else
typedef int ll;
#endif

typedef pair<ll, ll> pii;
typedef pair<pii, ll> ppi;
typedef pair<ll, pii> pip;
typedef vector<ll> vi;
typedef vector<pii> vpii;

#define forifrom(i, s, n) for (ll i = s; i < n; ++i)
#define forirto(i, n, e) for (ll i = (n) - 1; i >= e; --i)
#define fori(i, n) forifrom (i, 0, n)
#define forir(i, n) forirto (i, n, 0)

#define F first
#define S second
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define smin(a, b) a = min(a, (b))
#define smax(a, b) a = max(a, (b))

#define debug(x) cout << #x << " -> " << (x) << endl
#define debug2(x, y) cout << #x << ' ' << #y << " -> " << (x) << ' ' << (y) << endl
#define debug3(x, y, z) cout << #x << ' ' << #y << ' ' << #z << " -> " << (x) << ' ' << (y) << ' ' << (z) << endl
#define debug4(x, y, z, t) cout << #x << ' ' << #y << ' ' << #z << ' ' << #t << " -> " << (x) << ' ' << (y) << ' ' << (z) << ' ' << (t) << endl
#define debuga(x, n) cout << #x << " -> "; fori (i1_da, n) { cout << (x)[i1_da] << ' '; } cout << endl
#define debugaa(x, n, m) cout << #x << " ->\n"; fori (i1_daa, n) { fori (i2_daa, m) { cout << (x)[i1_daa][i2_daa] << ' '; } cout << '\n'; } cout << endl

const ll MOD = 1000000007;
const ll INF = 1000000000;
const long long BIG = 1446803456761533460LL;

#define XL (x << 1)
#define XR (XL | 1)
#define MD ((l + r) >> 1)
#define Add(a, b) a = ((a) + (b)) % MOD
#define Mul(a, b) a = (1LL * (a) * (b)) % MOD

// -----------------------------------------------------------------------

const ll maxn = 2010;

typedef array<array<ll, maxn>, maxn> Grid;

ll n, m;
Grid A, B;

bool check(Grid &A, ll k) {
    ll h = 0;
    forir (i, n) {
        fori (j, h) {
            if (abs(A[i][j] - A[i + 1][j]) > k) return false;
        }
        ll j = m;
        while (j > h && abs(A[i][j] - A[i][j - 1]) <= k &&
                        abs(A[i + 1][j - 1] - A[i][j - 1]) <= k) --j;
        h = j;
        fori (j, h - 1) {
            if (abs(A[i][j] - A[i][j + 1]) > k) return false;
        }
    }
    return true;
}

int main() {
    ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);

    cin >> n >> m;
    fori (i, n) fori (j, m) cin >> A[i][j], B[i][m - 1 - j] = A[i][j];
    fori (i, n) A[i][m] = A[i][m - 1], B[i][m] = B[i][m - 1];
    fori (j, m) A[n][j] = A[n - 1][j], B[n][j] = B[n - 1][j];
    ll l = -1, r = INF;
    while (r - l > 1) {
        ll mid = (l + r) / 2;
        if (check(A, mid) || check(B, mid)) r = mid;
        else l = mid;
    }
    cout << r << '\n';

}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 45
• Subtask 3: 0 / 40