Submission #496751

#	Time	Username	Problem	Language	Result	Execution time	Memory
496751		armashka	Maxcomp (info1cup18_maxcomp)	C++17	15 / 100	133 ms	23860 KiB

maxcomp

#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;
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];
	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 = 0, f = -1;
	for (int i = 1; i <= n * m; ++ i) res = max(res, p[i]);	 
	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);
				g[to].pb(cur);
			}
			to = (i * m) + j;
			if (i < n) {
				g[cur].pb(to);
				g[to].pb(cur);
			}
		}    	
	}

	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 (stderr)

maxcomp.cpp: In function 'void bfs(ll)':
maxcomp.cpp:54:14: warning: unused variable 'f' [-Wunused-variable]
   54 |  ll res = 0, f = -1;
      |              ^

• Subtask 1: 0 / 15
• Subtask 2: 15 / 15
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40