This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int INF = 30;
signed main() {
ios_base::sync_with_stdio(0), cin.tie(0);
int n, m;
cin >> n >> m;
vector<vector<int>> a(n, vector<int>(m));
int mn = INF;
for (auto& r : a)
for (auto& el : r) {
cin >> el;
mn = min(mn, el);
}
auto check = [&](int dif) {
int othermx = -INF, othermn = INF;
int curmx = m;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < curmx; ++j) {
if (a[i][j] - mn > dif) {
curmx = j;
break;
}
}
for (int j = curmx; j < m; ++j) {
othermx = max(othermx, a[i][j]);
othermn = min(othermn, a[i][j]);
}
}
if (othermx - othermn <= dif)
return true;
othermx = -INF, othermn = INF;
curmx = m;
for (int i = n - 1; i >= 0; --i) {
for (int j = 0; j < curmx; ++j) {
if (a[i][j] - mn > dif) {
curmx = j;
break;
}
}
for (int j = curmx; j < m; ++j) {
othermx = max(othermx, a[i][j]);
othermn = min(othermn, a[i][j]);
}
}
if (othermx - othermn <= dif)
return true;
othermx = -INF, othermn = INF;
curmx = 0;
for (int i = 0; i < n; ++i) {
for (int j = m - 1; j > curmx; --j) {
if (a[i][j] - mn > dif) {
curmx = j;
break;
}
}
for (int j = curmx; j >= 0; --j) {
othermx = max(othermx, a[i][j]);
othermn = min(othermn, a[i][j]);
}
}
if (othermx - othermn <= dif)
return true;
othermx = -INF, othermn = INF;
curmx = 0;
for (int i = n - 1; i >= 0; --i) {
for (int j = m - 1; j > curmx; --j) {
if (a[i][j] - mn > dif) {
curmx = j;
break;
}
}
for (int j = curmx; j >= 0; --j) {
othermx = max(othermx, a[i][j]);
othermn = min(othermn, a[i][j]);
}
}
if (othermx - othermn <= dif)
return true;
return false;
};
int l = 0, r = INF;
while (l + 1 < r) {
int mid = (l + r) / 2;
if (check(mid))
r = mid;
else
l = mid;
}
cout << r;
}
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |