Submission #1305014

#	Time	Username	Problem	Language	Result	Execution time	Memory
1305014		sqwiijqk	The Kingdom of JOIOI (JOI17_joioi)	C++20	60 / 100	4091 ms	63252 KiB

joioi

#include <bits/stdc++.h>
#include <experimental/random>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;

void solve1();

using ll = long long;
using ull = unsigned long long;
using ld = double;
using BIG = __int128_t;
const int MOD = 1e9 + 7;
const int INF = 1e9;

signed main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int qwerty = 1;
    // cin >> qwerty;
    while (qwerty--) {
        solve1();
    }
}

int dist(int a, int b) {
    return abs(a - b);
}

int get(vector<vector<int>> &a, vector<vector<int>> &color, int c) {
    int mn = INF, mx = -INF;
    for (int i = 0; i < a.size(); i++) {
        for (int j = 0; j < a[i].size(); j++) {
            if (color[i][j] == c) {
                mn = min(mn, a[i][j]);
                mx = max(mx, a[i][j]);
            }
        }
    }
    if (mx == -INF) return 0;
    return mx - mn;
}

void go_next(vector<vector<int>> &a) {
    int n = a.size();
    int m = a[0].size();
    vector<vector<int>> b(m, vector<int>(n));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            b[j][n - i - 1] = a[i][j];
        }
    }
    a = b;
}

bool check(vector<vector<int>> &a, int x) {
    bool flag = false;
    for (int ZZZ = 0; ZZZ < 4; ZZZ++) {
        int n = a.size();
        int m = a[0].size();
        int mx = 0;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                mx = max(mx, a[i][j]);
            }
        }
        vector<vector<int>> color(n, vector<int>(m, 2));
        int mn_i = m - 1;
        for (int i = 0; i < n; i++) {
            int now = -1;
            for (int j = 0; j <= mn_i; j++) {
                if (mx - a[i][j] > x) break;
                color[i][j] = 1;
                now = j;
            }
            mn_i = now;
        }
        int f = get(a, color, 1);
        int s = get(a, color, 2);
        if (max(f, s) <= x) {
            flag = true;
        }
        go_next(a);
    }
    return flag;
}

void solve1() {
    int n, m;
    cin >> n >> m;
    vector<vector<int>> a(n, vector<int>(m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> a[i][j];
        }
    }
    int l = -1, r = 2 * INF;
    while (r - l > 1) {
        int mid = (l + r) / 2;
        if (check(a, mid)) {
            r = mid;
        } else {
            l = mid;
        }
    }
    cout << r;
}

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