Submission #81821

#	Time	Username	Problem	Language	Result	Execution time	Memory
81821		mra2322001	Luxury burrow (IZhO13_burrow)	C++14	100 / 100	795 ms	54500 KiB

burrow

#include <bits/stdc++.h>
#define f0(i, n) for(int i(0); i < (n); i++)
#define f1(i, n) for(int i(1); i <= n; i++)

using namespace std;
typedef long long ll;
const int N = 1002;

int n, k, a[N][N], m, l[N], r[N], b[N], cur = 0;
vector <int> v;

bool check(int x){
    f1(i, n) b[i] = 0;
    int res = 0;
    stack <int> s;
    f1(i, m){
        f1(j, n){
            if(a[i][j] >= x) b[j]++;
            else b[j] = 0;
        }
        f1(j, n){
            while(s.size() && b[s.top()] >= b[j]) s.pop();
            if(s.size()) l[j] = s.top() + 1;
            else l[j] = 1;
            s.push(j);
        }
        while(s.size()) s.pop();
        for(int j = n; j >= 1; j--){
            while(s.size() && b[s.top()] >= b[j]) s.pop();
            if(s.size()) r[j] = s.top() - 1;
            else r[j] = n;
            s.push(j);
        }
        f1(j, n){
            res = max(res, (r[j] - l[j] + 1)*b[j]);
        }
        while(s.size()) s.pop();
    }
    if(res >= k){
        cur = res;
        return 1;
    }
    return 0;
}

int main(){
    ios_base::sync_with_stdio(0);

    cin >> m >> n >> k;
    f1(i, m) f1(j, n) { cin >> a[i][j]; v.emplace_back(a[i][j]); }
    sort(v.begin(), v.end());

    v.erase(unique(v.begin(), v.end()), v.end());
    int l = 0, r = v.size() - 1, ans = 0;
    while(l <= r){
        int mid = (l + r)/2;
        if(check(v[mid])) l = mid + 1, ans = mid;
        else r = mid - 1;
    }
    cout << v[ans] << " " << cur;
}

• Subtask 1: 100 / 100