oj.uz

Submission #396949

# Submission time Handle Problem Language Result Execution time Memory
396949 2021-05-01T02:40:01 Z timmyfeng The Kingdom of JOIOI (JOI17_joioi) C++17
100 / 100
 731 ms 44144 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 2001;

int prefix[N], suffix[N], diff[N][N], a[N][N];

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

    int n, m;
    cin >> n >> m;

    int maxi = INT_MIN, mini = INT_MAX;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            cin >> a[i][j];
            maxi = max(maxi, a[i][j]);
            mini = min(mini, a[i][j]);
        }
    }

    fill(diff[0], diff[0] + m + 1, INT_MIN);
    int ans = INT_MAX;

    for (int k = 0; k < 2; ++k) {
        for (int i = 0; i < n; ++i) {
            reverse(a[i], a[i] + m);
        }

        for (int l = 0; l < 2; ++l) {
            reverse(a, a + n);

            for (int i = 0; i < n; ++i) {
                copy(a[i], a[i] + m, prefix);
                for (int j = 1; j < m; ++j) {
                    prefix[j] = min(prefix[j], prefix[j - 1]);
                }

                copy(a[i], a[i] + m, suffix);
                for (int j = m - 2; j >= 0; --j) {
                    suffix[j] = max(suffix[j], suffix[j + 1]);
                }

                for (int j = 0; j <= m; ++j) {
                    diff[i + 1][j] = max({
                        j > 0 ? maxi - prefix[j - 1] : INT_MIN,
                        j < m ? suffix[j] - mini : INT_MIN,
                        diff[i][j]
                    });

                    if (j > 0) {
                        diff[i + 1][j] = min(diff[i + 1][j], diff[i + 1][j - 1]);
                    }
                }
            }

            ans = min(ans, *min_element(diff[n], diff[n] + m + 1));
        }
    }

    cout << ans << "\n";
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 452 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 452 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 7 ms 2896 KB Output is correct
17 Correct 9 ms 3136 KB Output is correct
18 Correct 9 ms 3148 KB Output is correct
19 Correct 10 ms 3020 KB Output is correct
20 Correct 9 ms 2772 KB Output is correct
21 Correct 10 ms 3252 KB Output is correct
22 Correct 9 ms 3220 KB Output is correct
23 Correct 10 ms 3148 KB Output is correct
24 Correct 8 ms 2920 KB Output is correct
25 Correct 9 ms 3148 KB Output is correct
26 Correct 9 ms 3148 KB Output is correct
27 Correct 9 ms 3148 KB Output is correct
28 Correct 9 ms 3148 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 452 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 7 ms 2896 KB Output is correct
17 Correct 9 ms 3136 KB Output is correct
18 Correct 9 ms 3148 KB Output is correct
19 Correct 10 ms 3020 KB Output is correct
20 Correct 9 ms 2772 KB Output is correct
21 Correct 10 ms 3252 KB Output is correct
22 Correct 9 ms 3220 KB Output is correct
23 Correct 10 ms 3148 KB Output is correct
24 Correct 8 ms 2920 KB Output is correct
25 Correct 9 ms 3148 KB Output is correct
26 Correct 9 ms 3148 KB Output is correct
27 Correct 9 ms 3148 KB Output is correct
28 Correct 9 ms 3148 KB Output is correct
29 Correct 547 ms 30420 KB Output is correct
30 Correct 571 ms 32028 KB Output is correct
31 Correct 575 ms 32008 KB Output is correct
32 Correct 594 ms 31940 KB Output is correct
33 Correct 500 ms 28116 KB Output is correct
34 Correct 582 ms 31948 KB Output is correct
35 Correct 731 ms 44144 KB Output is correct
36 Correct 596 ms 32844 KB Output is correct
37 Correct 678 ms 33380 KB Output is correct