#include <bits/stdc++.h>
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define fast ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
#define all(v) v.begin(),v.end()
#define pb push_back
#define sz size()
#define ft first
#define sd second
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef unsigned long long ull;
const int N = 1e6 + 5;
const ll M = 1e8;
const ll inf = 1e18;
const ll mod = 1e9;
const double Pi = acos(-1);
ll binpow(ll x, ll ti) { ll res = 1;while (ti){if(ti & 1)res *= x;x *= x;ti >>= 1; x %= mod; res %= mod;} return res;}
ll binmul(ll x, ll ti) { ll res = 0;while (ti){if(ti & 1)res += x;x += x;ti >>= 1; x %= mod; res %= mod;} return res;}
ll nok(ll a, ll b) { return (a*b)/__gcd(abs(a),abs(b)) * (a*b > 0 ? 1 : -1); }
bool odd(ll n) { return (n % 2 == 1); }
bool even(ll n) { return (n % 2 == 0); }
ll n, m, a[N], ans= -inf;
vector <ll> g[N];
void bfs(ll s) {
queue <ll> q;
vector <ll> d(n * m + 5, inf), mn(n * m + 5, inf), mx(n * m + 5, 0), p(n * m + 5, -inf);
q.push(s);
d[s] = 1;
mn[s] = mx[s] = a[s];
p[s] = -1;
while (q.sz) {
ll v = q.front();
q.pop();
for (auto to : g[v]) {
ll cur = max(mx[v], a[to]) - min(mn[v], a[to]) - (d[v] + 1);
if (p[to] < cur) {
p[to] = cur;
mx[to] = max(mx[v], a[to]);
mn[to] = min(mn[v], a[to]);
d[to] = d[v] + 1;
q.push(to);
}
}
}
ll res = -inf, f = -1;
for (int i = 1; i <= n * m; ++ i) res = max(res, p[i]);
//cout << s << " " << res << "\n";
ans = max(ans, res);
}
const void solve(/*Armashka*/) {
cin >> n >> m;
for (int i = 1; i <= n * m; ++ i) cin >> a[i];
for (int i = 1; i <= n; ++ i) {
for (int j = 1; j <= m; ++ j) {
int cur = (i - 1) * m + j;
int to = (i - 1) * m + j + 1;
if (j < m) {
g[cur].pb(to);
}
to = (i * m) + j;
if (i < n) {
g[cur].pb(to);
}
}
}
for (int i = 1; i <= n * m; ++ i) bfs(i);
cout << ans << "\n";
}
signed main() {
fast;
//freopen("divide.in", "r", stdin);
//freopen("divide.out", "w", stdout);
int tt = 1;
//cin >> tt;
while (tt --) {
solve();
}
}
/*
5 4 4
1 2
3 1
3 4
5 3
4 5 2 3
2 1 3 1
1 3 5
2 3 4 5
2 1 3 1
*/
Compilation message
maxcomp.cpp: In function 'void bfs(ll)':
maxcomp.cpp:55:17: warning: unused variable 'f' [-Wunused-variable]
55 | ll res = -inf, f = -1;
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
23756 KB |
Output is correct |
| 2 |
Correct |
11 ms |
23736 KB |
Output is correct |
| 3 |
Correct |
11 ms |
23788 KB |
Output is correct |
| 4 |
Correct |
12 ms |
23756 KB |
Output is correct |
| 5 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 6 |
Incorrect |
15 ms |
23716 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
26 ms |
23892 KB |
Output is correct |
| 2 |
Correct |
27 ms |
23756 KB |
Output is correct |
| 3 |
Correct |
24 ms |
23868 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
23756 KB |
Output is correct |
| 2 |
Correct |
11 ms |
23736 KB |
Output is correct |
| 3 |
Correct |
11 ms |
23788 KB |
Output is correct |
| 4 |
Correct |
12 ms |
23756 KB |
Output is correct |
| 5 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 6 |
Incorrect |
15 ms |
23716 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
23756 KB |
Output is correct |
| 2 |
Correct |
11 ms |
23736 KB |
Output is correct |
| 3 |
Correct |
11 ms |
23788 KB |
Output is correct |
| 4 |
Correct |
12 ms |
23756 KB |
Output is correct |
| 5 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 6 |
Incorrect |
15 ms |
23716 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
