/// In The Name Of God
#include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define pp pop_back
#define mp make_pair
#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()
#define rep(i, l, r) for (int i = (l); i <= (r); i++)
#define per(i, l, r) for (int i = (l); i >= (r); i--)
#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define nl '\n'
#define ioi exit(0);
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
const int N = (int)2000 + 7;
const int inf = (int)1e9 + 7;
const int mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;
const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1};
const int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};
using namespace std;
int n, m;
int a[N][N];
vector <int> cmp;
int len[N];
int calc1() {
int ans = inf;
for (auto it : cmp) {
int mx = -inf, mn = inf;
rep(i, 1, m) {
len[i] = n + 1;
rep(j, 1, n) {
if (a[j][i] > it) {
len[i] = j;
break;
}
}
}
{ /// cor
int id = 1;
rep(i, 1, m) if (len[i] > len[id]) id = i;
int pref = len[id];
per(i, id, 1) pref = min(pref, len[i]), len[i] = pref;
pref = len[id];
rep(i, id, m) pref = min(pref, len[i]), len[i] = pref;
}
rep(i, 1, m) {
rep(j, len[i], n) {
mx = max(mx, a[j][i]);
mn = min(mn, a[j][i]);
}
}
ans = min(ans, max(it - cmp[0], mx - mn));
}
return ans;
}
int res[N][N];
int calc2() {
int ans = inf;
len[m + 1] = 0;
for (auto it : cmp) {
int mx = -inf, mn = inf;
bool p = 0;
per(i, m, 1) {
len[i] = 0;
per(j, n, 1) {
if (a[j][i] > it) {
len[i] = j;
break;
}
}
}
rep(i, 1, m) len[i] = n - len[i];
{ /// cor
int id = 1;
rep(i, 1, m) if (len[i] > len[id]) id = i;
int pref = len[id];
per(i, id, 1) pref = min(pref, len[i]), len[i] = pref;
pref = len[id];
rep(i, id, m) pref = min(pref, len[i]), len[i] = pref;
}
rep(i, 1, m) len[i] = n - len[i];
rep(i, 1, m) {
rep(j, 1, len[i]) {
mx = max(mx, a[j][i]);
mn = min(mn, a[j][i]);
}
}
ans = min(ans, max(it - cmp[0], mx - mn));
}
return ans;
}
int main() {
#ifdef IOI2018
freopen ("in.txt", "r", stdin);
#endif
Kazakhstan
cin >> n >> m;
rep(i, 1, n) rep(j, 1, m) {
cin >> a[i][j];
cmp.pb(a[i][j]);
}
sort(all(cmp));
cmp.erase(unique(all(cmp)), cmp.end());
cout << min(calc1(), calc2());
ioi
}
Compilation message
joioi.cpp: In function 'int calc2()':
joioi.cpp:82:8: warning: unused variable 'p' [-Wunused-variable]
bool p = 0;
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
384 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
384 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
384 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
