//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,sse,sse2,sse3,ssse3,sse4,abm,popcnt,mmx")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double db;
typedef long double ldb;
typedef complex<double> cd;
constexpr ll INF64 = 9'000'000'000'000'000'000, INF32 = 2'000'000'000, MOD = 1'000'000'007;
constexpr db PI = acos(-1);
constexpr bool IS_FILE = false, IS_TEST_CASES = false;
random_device rd;
mt19937 rnd32(rd());
mt19937_64 rnd64(rd());
template<typename T>
bool assign_max(T& a, T b) {
if (b > a) {
a = b;
return true;
}
return false;
}
template<typename T>
bool assign_min(T& a, T b) {
if (b < a) {
a = b;
return true;
}
return false;
}
template<typename T>
T square(T a) {
return a * a;
}
template<>
struct std::hash<pair<ll, ll>> {
ll operator() (pair<ll, ll> p) const {
return ((__int128)p.first * MOD + p.second) % INF64;
}
};
bool check(ll n, ll m, vector<vector<ll>>& arr, ll x) {
ll lst = m;
for (ll i = 0; i < n; i++) {
ll lo = lst;
if (i) {
ll mi = -1, ma = -1;
for (ll j = 0; j < m; j++) {
if (abs(arr[i][j] - arr[i - 1][j]) > x) {
if (mi == -1) {
mi = j;
}
ma = j;
}
}
if (ma >= lst) {
return false;
}
if (mi != -1) {
lst = mi + 1;
}
}
for (ll j = 1; j < m; j++) {
if (abs(arr[i][j] - arr[i][j - 1]) > x) {
if (j > lst) {
return false;
}
if (j == lo) {
return false;
}
lst = j;
}
}
}
return true;
}
ll sol(ll n, ll m, vector<vector<ll>>& arr) {
ll l = -1, r = 1'000'000'000;
while (r - l > 1) {
ll mid = (l + r) / 2;
if (check(n, m, arr, mid)) {
r = mid;
} else {
l = mid;
}
}
return r;
}
void solve() {
ll n, m;
cin >> n >> m;
vector<vector<ll>> arr(n, vector<ll>(m));
for (ll i = 0; i < n; i++) {
for (ll j = 0; j < m; j++) {
cin >> arr[i][j];
}
}
ll ans = sol(n, m, arr);
reverse(arr.begin(), arr.end());
cout << min(ans, sol(n, m, arr)) << '\n';
}
int main() {
if (IS_FILE) {
freopen("", "r", stdin);
freopen("", "w", stdout);
}
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
ll t = 1;
if (IS_TEST_CASES) {
cin >> t;
}
for (ll i = 0; i < t; i++) {
solve();
}
}
Compilation message
joioi.cpp: In function 'int main()':
joioi.cpp:115:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
115 | freopen("", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~
joioi.cpp:116:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
116 | freopen("", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
