Submission #924323

#	Time	Username	Problem	Language	Result	Execution time	Memory
924323		vjudge1	Maze (JOI23_ho_t3)	C++17	0 / 100	1 ms	348 KiB

Main

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

using namespace std;

int R, C, N;

bool isBest(int d1, int d2, pair<int, int>& p){
	int mn1 = min(d1, d2);
	int mx1 = max(d1, d2);
	int mn2 = min(p.first, p.second);
	int mx2 = max(p.first, p.second);
	if(!((mx1 <= N && mn1 < N) || (mx2 <= N && mn2 < N))) return false;
	if(mx1 == mx2) return mn1 < mn2;
	else return mx1 < mx2;
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	cin >> R >> C >> N;
	int Sr, Sc, Gr, Gc; cin >> Sr >> Sc >> Gr >> Gc; Sr--; Sc--; Gr--; Gc--;
	vector<string> v(R);
	for(auto &i : v) cin >> i;
	vector<pair<int, int>> added = {{Sr, Sc}};
	vector<vector<int>> dist(R, vector<int>(C, 1e9));
	vector<vector<bool>> vis(R, vector<bool>(C, false));
	vector<vector<pair<int, int>>> best(R, vector<pair<int, int>>(C, {1e9, 1e9}));
	dist[Sr][Sc] = 0;
	for(int t = 0; t < 2*R*C; t++){
		priority_queue<tuple<int, int, int, int>> q;
		int d = 0;
		for(pair<int, int>& p : added){
			q.push({0, 0, p.first, p.second});
			best[p.first][p.second] = {0, 0};
			d = dist[p.first][p.second];
			vis[p.first][p.second] = false;
		}
		added.clear();
		while(!q.empty()){
			int i = get<2>(q.top()); int j = get<3>(q.top()); q.pop();
			if(vis[i][j]) continue;
			vis[i][j] = true;
			if(best[i][j].first != 0 || best[i][j].second != 0){
				added.push_back({i, j});
			}
			for(int ai = -1; ai <= 1; ai++){
				for(int aj = -1; aj <= 1; aj++){
					if(ai * aj != 0 || i + ai < 0 || i + ai >= R || j + aj < 0 || j + aj >= C) continue;
					int ni = i + ai; int nj = j + aj;
					if(dist[ni][nj] > d && isBest(best[i][j].first+abs(ai), best[i][j].second+abs(aj), best[ni][nj])){
						dist[ni][nj] = d+1;
						best[ni][nj] = {best[i][j].first+abs(ai), best[i][j].second+abs(aj)};
						q.push({-max(best[ni][nj].first, best[ni][nj].second), -min(best[ni][nj].first, best[ni][nj].second), ni, nj});
					}else if(dist[ni][nj] > d + 1 && v[ni][nj] == '.'){
						dist[ni][nj] = d + 1;
						q.push({1e9, 1e9, ni, nj});
					}
				}
			}
		}
	}
	cout << dist[Gr][Gc] << "\n";
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 19
• Subtask 3: 0 / 16
• Subtask 4: 0 / 19
• Subtask 5: 0 / 5
• Subtask 6: 0 / 19
• Subtask 7: 0 / 8
• Subtask 8: 0 / 6