#include <bits/stdc++.h>
#define pii pair<ll, ll>
#define mp make_pair
#define F first
#define S second
#define PB push_back
#define FOR(i, u, v) for (int i = u; i <= v; i++)
#define FORD(i, v, u) for (int i = v; i >= u; i--)
#define ll long long
#define N 2003
#define LN 19
#define maxc 1000000007
using namespace std;
int n, m, a[N][N], amin, amax, pos[N];
bool b[N][N];
void revRow()
{
FOR(i, 1, n)
FOR(j, 1, m/2)
swap(a[i][j], a[i][m-j+1]);
}
void revCol()
{
FOR(j, 1, m)
FOR(i, 1, n/2)
swap(a[i][j], a[n-i+1][j]);
}
bool ok(int diff)
{
FOR(i, 1, n)
FOR(j, 1, m)
b[i][j] = (a[i][j] >= (amax - diff));
pos[0] = m;
FOR(i, 1, n)
{
pos[i] = pos[i-1];
FOR(j, 1, pos[i-1])
if (b[i][j] == 0) {pos[i] = j-1; break;}
}
int mx = 0, mn = maxc;
FOR(i, 1, n)
FOR(j, pos[i]+1, m)
{
mx = max(mx, a[i][j]);
mn = min(mn, a[i][j]);
}
if (abs(mx - mn) <= diff) return 1;
return 0;
}
bool check(int diff)
{
if (ok(diff)) return 1;
revRow();
if (ok(diff)) return 1;
revCol();
if (ok(diff)) return 1;
revRow();
if (ok(diff)) return 1;
return 0;
}
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//freopen("INP.TXT", "r", stdin);
cin >> n >> m;
FOR(i, 1, n)
FOR(j, 1, m)
{
cin >> a[i][j];
amax = max(amax, a[i][j]);
amin = min(amin, a[i][j]);
}
int l = 0, r = amax - amin + 1;
while (r - l > 1)
{
int mid = (r + l)/2;
if (check(mid)) r = mid;
else l = mid;
}
cout <<r;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
420 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
420 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
420 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
