//UNSTOPPABLE
#include "bits/stdc++.h"
#include <ext/pb_ds/assoc_container.hpp>
#define ll long long
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define int long long
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
#define pii pair<int,int>
#define tpii pair <pair <int,int> , int>
#define bruh cout << "NO\n"
using namespace std;
using namespace __gnu_pbds;
const int N = 1e3 + 5 , M = 1e6 + 5;
int mod = 1e9 + 7;
const int INF = 1e18;
int n,m,a[N][N],num[N][N],val[M],used[M];
vector <int> g[M],dist[5001][5001];
void Goldik(){
cin >> n >> m;
int cur = 0;
for(int i = 1 ; i <= n ; i++){
for(int j = 1 ; j <= m ; j++){
cin >> a[i][j];
num[i][j] = ++cur;
val[cur] = a[i][j];
}
}
for(int i = 1 ; i <= n ; i++){
for(int j = 1 ; j <= m ; j++){
int x = num[i][j];
if(i != 1){
g[x].pb(num[i - 1][j]);
}
if(j != 1){
g[x].pb(num[i][j - 1]);
}
if(i != n){
g[x].pb(num[i + 1][j]);
}
if(j != m){
g[x].pb(num[i][j + 1]);
}
}
}
for(int i = 1 ; i <= cur ; i++){
for(int j = 1 ; j <= cur ; j++){
dist[i][j].pb(INF);
}
}
int ans = -INF;
for(int i = 1 ; i <= cur ; i++){
for(int j = 1 ; j <= cur ; j++) used[j] = 0;
deque <int> q = {};
q.pb(i);
dist[i][i].clear();
dist[i][i].pb(i);
used[i] = 1;
while(q.size()){
int v = q.front();
q.ppf();
used[v] = 1;
for(auto to : g[v]){
if(!used[to]){
if(dist[i][to].back() == INF || dist[i][to].size() > dist[i][v].size() + 1){
dist[i][to] = dist[i][v];
dist[i][to].pb(to);
q.pb(to);
}
}
}
}
for(int j = 1 ; j <= cur ; j++){
if(i == j) continue;
// cout << "i j -- > " << i << ' ' << j << '\n';
int mx = -INF , mn = INF;
for(auto it : dist[i][j]){
// cout << it << ' ';
mx = max(mx , val[it]);
mn = min(mn , val[it]);
}
// cout << '\n';
// cout << "MX MN -- > " << mx << ' ' << mn << '\n';
ans = max(ans , mx - mn - (ll)dist[i][j].size());
}
}
cout << ans;
}
//rewai mnogo zadach vozmozhno odna iz nih gde to popadetsya
//returning winter prime?
//chem prowe tem luchshe
signed main(/*AZ AZDAN UZDIKSIZ*/){
//freopen("txt.in","r",stdin);
//freopen("txt.out","w",stdout);
ios_base::sync_with_stdio(0);
cin.tie(0);
srand(time(0));
int TT = 1;
// cin >> TT;
for(int i = 1 ; i <= TT ; i++){
//cout << "Case " << i << ": ";
Goldik();
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
70 ms |
524288 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
67 ms |
524288 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
70 ms |
524288 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
70 ms |
524288 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
