oj.uz

Submission #110875

# Submission time Handle Problem Language Result Execution time Memory
110875 2019-05-12T17:16:14 Z WLZ The Kingdom of JOIOI (JOI17_joioi) C++17
100 / 100
 826 ms 55168 KB 
#include <bits/stdc++.h>
using namespace std;

const int INF = 0x3f3f3f3f;

int n, m, mx = 0, mn = INF;
vector< vector<int> > a;

void flip_h() {
  for (int j = 1; j <= m; j++) {
    for (int i = 1; i <= n / 2; i++) {
      swap(a[n - i + 1][j], a[i][j]);
    }
  }
}

void flip_v() {
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m / 2; j++) {
      swap(a[i][m - j + 1], a[i][j]);
    }
  }
}

int check(int k) {
  int t = 0;
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) {
      if (a[i][j] < mx - k) {
        t = max(t, j + 1);
      }
    }
    for (int j = 1; j < t; j++) {
      if (a[i][j] > mn + k) {
        return 0;
      }
    }
  }
  return 1;
}

int solve() {
  int lo = 0, hi = mx - mn;
  while (lo < hi) {
    int mid = (lo + hi) /  2;
    if (check(mid)) {
      hi = mid;
    } else {
      lo = mid + 1;
    }
  }
  return lo;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> m;
  a.assign(n + 1, vector<int>(m + 2, 0));
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) {
      cin >> a[i][j];
      mx = max(mx, a[i][j]);
      mn = min(mn, a[i][j]);
    }
  }
  int ans = solve();
  flip_h();
  ans = min(ans, solve());
  flip_v();
  ans = min(ans, solve());
  flip_h();
  ans = min(ans, solve());
  cout << ans << '\n';
  return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 3 ms 384 KB Output is correct
16 Correct 5 ms 512 KB Output is correct
17 Correct 8 ms 768 KB Output is correct
18 Correct 8 ms 768 KB Output is correct
19 Correct 9 ms 840 KB Output is correct
20 Correct 9 ms 768 KB Output is correct
21 Correct 10 ms 896 KB Output is correct
22 Correct 11 ms 896 KB Output is correct
23 Correct 12 ms 1024 KB Output is correct
24 Correct 10 ms 896 KB Output is correct
25 Correct 14 ms 896 KB Output is correct
26 Correct 10 ms 896 KB Output is correct
27 Correct 9 ms 896 KB Output is correct
28 Correct 11 ms 896 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 3 ms 384 KB Output is correct
16 Correct 5 ms 512 KB Output is correct
17 Correct 8 ms 768 KB Output is correct
18 Correct 8 ms 768 KB Output is correct
19 Correct 9 ms 840 KB Output is correct
20 Correct 9 ms 768 KB Output is correct
21 Correct 10 ms 896 KB Output is correct
22 Correct 11 ms 896 KB Output is correct
23 Correct 12 ms 1024 KB Output is correct
24 Correct 10 ms 896 KB Output is correct
25 Correct 14 ms 896 KB Output is correct
26 Correct 10 ms 896 KB Output is correct
27 Correct 9 ms 896 KB Output is correct
28 Correct 11 ms 896 KB Output is correct
29 Correct 541 ms 37488 KB Output is correct
30 Correct 443 ms 36616 KB Output is correct
31 Correct 509 ms 39288 KB Output is correct
32 Correct 454 ms 39288 KB Output is correct
33 Correct 375 ms 34168 KB Output is correct
34 Correct 497 ms 39544 KB Output is correct
35 Correct 758 ms 54876 KB Output is correct
36 Correct 638 ms 47876 KB Output is correct
37 Correct 826 ms 55168 KB Output is correct