764.orderOfLargestPlusSign.cpp

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

int orderOfLargestPlusSign(int n, vector<vector<int>> &mines) {
    vector<vector<int>> dp(n, vector<int>(n, n));
    unordered_set<int> banned;
    for (auto &&vec : mines) {
        banned.emplace(vec[0] * n + vec[1]);
    }
    int ans = 0;
    for (int i = 0; i < n; i++) {
        int count = 0;
        /* left */
        for (int j = 0; j < n; j++) {
            if (banned.count(i * n + j)) {
                count = 0;
            } else {
                count++;
            }
            dp[i][j] = min(dp[i][j], count);
        }
        count = 0;
        /* right */
        for (int j = n - 1; j >= 0; j--) {
            if (banned.count(i * n + j)) {
                count = 0;
            } else {
                count++;
            }
            dp[i][j] = min(dp[i][j], count);
        }
    }
    for (int i = 0; i < n; i++) {
        int count = 0;
        /* up */
        for (int j = 0; j < n; j++) {
            if (banned.count(j * n + i)) {
                count = 0;
            } else {
                count++;
            }
            dp[j][i] = min(dp[j][i], count);
        }
        count = 0;
        /* down */
        for (int j = n - 1; j >= 0; j--) {
            if (banned.count(j * n + i)) {
                count = 0;
            } else {
                count++;
            }
            dp[j][i] = min(dp[j][i], count);
            ans = max(ans, dp[j][i]);
        }
    }
    return ans;
}

int main() {
    cout << "13" << endl;
    return 0;
}