#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 2000 + 5, inf = 1e9;
int n, m, max_val = -inf, min_val = inf;
void flipRow(vector<vector<int>>& a) {
for (int i = 0; i < n/2; ++i)
for (int j = 0; j < m; ++j) swap(a[i][j], a[n-i-1][j]);
}
void flipCol(vector<vector<int>>& a) {
for (int j = 0; j < m/2; ++j)
for (int i = 0; i < n; ++i) swap(a[i][j], a[i][m-j-1]);
}
int top(int mid, vector<vector<int>>& a) {
for (int i = 0, cur_r = m-1; i < n; ++i) {
for (int j = cur_r; ~j; --j) if (max_val - a[i][j] > mid) cur_r = j-1;
for (int j = cur_r+1; j < m; ++j) if (a[i][j] - min_val > mid) return 0;
}
return 1;
}
vector<vector<int>> a[4];
int check(int mid) {
for (int i = 0; i < 4; ++i)
if (top(mid, a[i])) return 1;
return 0;
}
int main() {
cin.tie(0)->sync_with_stdio(0); cout.tie(0);
cin >> n >> m; a[0].resize(n, vector<int>(m));
for (int i = 0; i < n; ++i)
for (int j = 0; j < m; ++j)
cin >> a[0][i][j],
max_val = max(max_val, a[0][i][j]),
min_val = min(min_val, a[0][i][j]);
a[3] = a[2] = a[1] = a[0];
for (int i = 0; i < 4; ++i) {
if (i & 1) flipRow(a[i]);
if (i & 2) flipCol(a[i]);
}
int lo = 0, hi = max_val - min_val, mid, ans = -1;
while (lo <= hi) {
mid = lo + hi >> 1;
if (check(mid))
ans = mid, hi = mid - 1;
else
lo = mid + 1;
}
cout << ans;
return 0;
}
Compilation message
joioi.cpp: In function 'int main()':
joioi.cpp:42:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
42 | mid = lo + hi >> 1;
| ~~~^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
316 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
316 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
316 KB |
Output is correct |
| 13 |
Correct |
1 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
324 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
316 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
316 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
316 KB |
Output is correct |
| 13 |
Correct |
1 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
324 KB |
Output is correct |
| 15 |
Correct |
1 ms |
340 KB |
Output is correct |
| 16 |
Correct |
3 ms |
852 KB |
Output is correct |
| 17 |
Correct |
5 ms |
852 KB |
Output is correct |
| 18 |
Correct |
4 ms |
852 KB |
Output is correct |
| 19 |
Correct |
5 ms |
852 KB |
Output is correct |
| 20 |
Correct |
4 ms |
852 KB |
Output is correct |
| 21 |
Correct |
7 ms |
868 KB |
Output is correct |
| 22 |
Correct |
6 ms |
852 KB |
Output is correct |
| 23 |
Correct |
5 ms |
956 KB |
Output is correct |
| 24 |
Correct |
6 ms |
848 KB |
Output is correct |
| 25 |
Correct |
5 ms |
852 KB |
Output is correct |
| 26 |
Correct |
6 ms |
956 KB |
Output is correct |
| 27 |
Correct |
8 ms |
972 KB |
Output is correct |
| 28 |
Correct |
5 ms |
852 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
316 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
316 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
316 KB |
Output is correct |
| 13 |
Correct |
1 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
324 KB |
Output is correct |
| 15 |
Correct |
1 ms |
340 KB |
Output is correct |
| 16 |
Correct |
3 ms |
852 KB |
Output is correct |
| 17 |
Correct |
5 ms |
852 KB |
Output is correct |
| 18 |
Correct |
4 ms |
852 KB |
Output is correct |
| 19 |
Correct |
5 ms |
852 KB |
Output is correct |
| 20 |
Correct |
4 ms |
852 KB |
Output is correct |
| 21 |
Correct |
7 ms |
868 KB |
Output is correct |
| 22 |
Correct |
6 ms |
852 KB |
Output is correct |
| 23 |
Correct |
5 ms |
956 KB |
Output is correct |
| 24 |
Correct |
6 ms |
848 KB |
Output is correct |
| 25 |
Correct |
5 ms |
852 KB |
Output is correct |
| 26 |
Correct |
6 ms |
956 KB |
Output is correct |
| 27 |
Correct |
8 ms |
972 KB |
Output is correct |
| 28 |
Correct |
5 ms |
852 KB |
Output is correct |
| 29 |
Correct |
368 ms |
60092 KB |
Output is correct |
| 30 |
Correct |
394 ms |
58536 KB |
Output is correct |
| 31 |
Correct |
390 ms |
63176 KB |
Output is correct |
| 32 |
Correct |
379 ms |
63160 KB |
Output is correct |
| 33 |
Correct |
328 ms |
55196 KB |
Output is correct |
| 34 |
Correct |
397 ms |
63144 KB |
Output is correct |
| 35 |
Correct |
504 ms |
63264 KB |
Output is correct |
| 36 |
Correct |
463 ms |
55244 KB |
Output is correct |
| 37 |
Correct |
521 ms |
63232 KB |
Output is correct |
