Submission #464792

#	Time	Username	Problem	Language	Result	Execution time	Memory
464792		hhhhaura	Maxcomp (info1cup18_maxcomp)	C++14	15 / 100	51 ms	368 KiB

maxcomp

#define wiwihorz
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma loop-opt(on)

#define rep(i, a, b) for(int i = a; i <= b; i ++)
#define rrep(i, a, b) for(int i = b; i >= a; i--)
#define all(x) x.begin(), x.end()
#define ceil(a, b) ((a + b - 1) / (b))

using namespace std;

#define INF 1000000000000000000
#define int long long int
#define pii pair<int, int>
#define random mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count())

#ifdef wiwihorz
#define print(a...) cerr << "Line " << __LINE__ << ": ", kout("[" + string(#a) + "] = ", a)
void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
void kout() { cerr << endl; }
template<class T1, class ... T2> void kout(T1 a, T2 ... e) { cerr << a << " ", kout(e...);} 
#else
#define print(...) 0
#define vprint(...) 0
#endif
namespace solver {
	int n, m;
	vector<vector<int>> a, dis, vis;
	vector<int> dirx = {0, 0, 1, -1};
	vector<int> diry = {1, -1, 0, 0};
	vector<int> v;
	void init_(int _n, int _m) {
		n = _n, m = _m;
		a.assign(n, vector<int>(m, 0));
	}
	void update(int x, int y) {
		vis[x][y] = 1;
		rep(i, 0, 3) {
			int nx = x + dirx[i], ny = y + diry[i];
			if(nx < 0 || ny < 0 || nx >= n || ny >= m) continue;
			dis[x][y] = min(dis[x][y], dis[nx][ny] + 1);
		}
		queue<int> q; 
		q.push(x * m + y);
		while(q.size()) {
			int cur = q.front(); q.pop();
			int cx = cur / m, cy = cur % m;
			rep(i, 0, 3) {
				int nx = cx + dirx[i], ny = cy + diry[i];
				if(nx < 0 || ny < 0 || nx >= n || ny >= m) continue;
				if(dis[cx][cy] + 1 < dis[nx][ny] && vis[nx][ny]) {
					dis[nx][ny] = dis[cx][cy] + 1;
					q.push(nx * m + ny);
				}
			}
		}
		return;
	}
	int solve() {
		vector<pii> b;
		rep(i, 0, n - 1) rep(j, 0, m - 1) {
			b.push_back({a[i][j], i * m + j});
			v.push_back(a[i][j]);
		}	
		sort(all(v));
		v.resize(unique(all(v)) - v.begin());
		sort(all(b));
		int sz = v.size(), ans = 0, x, y, ii = 0, jj, pre;
		rep(i, 0, sz - 1) {
			dis.assign(n, vector<int>(m, INF));
			vis.assign(n, vector<int>(m, 0));
			while(ii < n * m && v[i] == b[ii].first) {
				x = b[ii].second / m, y = b[ii].second % m;
				dis[x][y] = 0, vis[x][y] = 1, ii++;
			}
			jj = ii;
			rep(j, i + 1, sz - 1) {
				pre = jj;
				while(jj < n * m && v[j] == b[jj].first) {
					x = b[jj].second / m, y = b[jj].second % m;
					update(x, y), jj++;
				}
				rep(kk, pre, jj - 1) {
					x = b[kk].second / m, y = b[kk].second % m;
					ans = max(ans, v[j] - v[i] - dis[x][y] - 1);
				}
			}
		}
		return ans;
	}

};
using namespace solver;
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	int n, m;
	cin >> n >> m;
	init_(n, m);
	rep(i, 0, n - 1) rep(j, 0, m - 1) {
		cin >> a[i][j];
	}
	cout << solve() << "\n";
	return 0;
}  

Compilation message (stderr)

maxcomp.cpp:4: warning: ignoring '#pragma loop ' [-Wunknown-pragmas]
    4 | #pragma loop-opt(on)
      | 
maxcomp.cpp:20:13: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
      |             ^~~~
maxcomp.cpp:20:21: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
      |                     ^~~~

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