Submission #963337

#	Time	Username	Problem	Language	Result	Execution time	Memory
963337		biank	Maxcomp (info1cup18_maxcomp)	C++14	100 / 100	304 ms	4408 KiB

maxcomp

#include <bits/stdc++.h>
 
using namespace std;
 
#define sz(x) int(x.size())
#define all(x) begin(x),end(x)
 
const int INF = 2e9;
 
struct STree {
    int n;
    vector<int> st;
    STree(int _n) : n(_n), st(2 * n, -INF) {}
    void update(int p, int val) {
        p += n;
        if (st[p] < val) {
            st[p] = val;
            while (p /= 2) {
                st[p] = max(st[2 * p], st[2 * p + 1]);
            }
        }
    }
    int query(int l, int r) {
        int res = -INF;
        for (l += n, r += n; l < r; l /= 2, r /= 2) {
            if (l & 1) res = max(res, st[l++]);
            if (r & 1) res = max(st[--r], res);
        }
        return res;
    }
};
 
int solve(vector<vector<int>> &a) {
    int n = sz(a), m = sz(a[0]);
    STree sum(m), sub(m);
    int ans = -INF;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            sum.update(j, a[i][j] + i + j);
            sub.update(j, -a[i][j] + i + j);
            ans = max({ans, sum.query(0, j + 1) - i - j - a[i][j] - 1, a[i][j] - i - j + sub.query(0, j + 1) - 1});
        }
    }
    return ans;
}
 
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    
    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 ans = solve(a);
    for (int i = 0; i < n; i++) {
        reverse(all(a[i]));
    }
    ans = max(ans, solve(a));
    cout << ans << '\n';
    
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40