Submission #993204

#	Time	Username	Problem	Language	Result	Execution time	Memory
993204		yanb	The Kingdom of JOIOI (JOI17_joioi)	C++14	0 / 100	0 ms	348 KiB

joioi

#include <bits/stdc++.h>

using namespace std;

#define int long long

bool good(int n, int m, vector<vector<int>> &a, int x) {
    int mn = 1e11, mx = -1e11;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            mn = min(mn, a[i][j]);
            mx = max(mx, a[i][j]);
        }
    }

    vector<vector<int>> need(n, vector<int>(m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (a[i][j] <= mx - x) need[i][j] += 1;
            if (a[i][j] >= mn + x) need[i][j] += 2;
            if (need[i][j] == 3) return 0;
        }
    }

    /*for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            switch (need[i][j]) {
                case 0: cout << " "; break;
                case 1: cout << "-"; break;
                case 2: cout << "+"; break;
                case 3: cout << "±";
            }
        }
        cout << "\n";
    }*/

    for (int i = 0; i < n; i++) {
        int ch = 0, cur = -1;
        for (int j = 0; j < m; j++) {
            if (need[i][j] != 0 && need[i][j] != cur) {
                ch++;
                cur = need[i][j];
            }
        }
        if (ch > 2) {
            return 0;
        }
    }

    for (int j = 0; j < m; j++) {
        int ch = 0, cur = -1;
        for (int i = 0; i < n; i++) {
            if (need[i][j] != 0 && need[i][j] != cur) {
                ch++;
                cur = need[i][j];
            }
        }
        if (ch > 2) {
            return 0;
        }
    }

    return 1;
}

int solve(int n, int m, vector<vector<int>> &a) {
    int l = -1, r = 1e11;
    while (r - l > 1) {
        int md = (l + r) / 2;
        if (good(n, m, a, md)) {
            r = md;
        } else {
            l = md;
        }
    }

    return l;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m;
    cin >> n >> m;
    vector<vector<int>> a_(n, vector<int>(m)), a(n, vector<int>(m));

    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            cin >> a_[i][j];

    int ans = solve(n, m, a_);
    cout << ans << "\n";
}   

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