結果
問題 | No.5006 Hidden Maze |
ユーザー | platinum |
提出日時 | 2022-06-11 23:46:39 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
MLE
|
実行時間 | - |
コード長 | 3,865 bytes |
コンパイル時間 | 2,178 ms |
実行使用メモリ | 836,224 KB |
スコア | 0 |
最終ジャッジ日時 | 2022-06-12 13:35:48 |
合計ジャッジ時間 | 9,322 ms |
ジャッジサーバーID (参考情報) |
judge15 / judge14 |
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テストケース
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ソースコード
#include <bits/stdc++.h> #define rep(i,n) for(int i = 0; i < (int)(n); i++) using namespace std; using LL = long long; using P = pair<int,int>; using vv = vector<vector<int>>; const int INF = (int)1e9; const LL LINF = (LL)1e18; const double eps = 1e-5; const int min_p = 6; const int max_p = 15; int dy[4] = {-1, 1, 0, 0}; int dx[4] = {0, 0, -1, 1}; string dir = "UDLR"; double h[20][21], v[21][20]; string bfs(){ int dist[20][20]; rep(i,20){ rep(j,20) dist[i][j] = -1; } dist[0][0] = 0; queue<P> q; q.emplace(0, 0); while(!q.empty()){ pair<int,int> p = q.front(); q.pop(); int y = p.first, x = p.second; int d = dist[y][x]; if(v[y][x] < 0.5 && dist[y-1][x] == -1){ dist[y-1][x] = d + 1; q.emplace(y - 1, x); } if(v[y+1][x] < 0.5 && dist[y+1][x] == -1){ dist[y+1][x] = d + 1; q.emplace(y + 1, x); } if(h[y][x] < 0.5 && dist[y][x-1] == -1){ dist[y][x-1] = d + 1; q.emplace(y, x - 1); } if(h[y][x+1] < 0.5 && dist[y][x+1] == -1){ dist[y][x+1] = d + 1; q.emplace(y, x + 1); } } string res; int y = 19, x = 19; if(dist[y][x] == -1){ rep(i,19) res.push_back('R'); rep(i,19) res.push_back('D'); return res; } while(y != 0 || x != 0){ int d = dist[y][x]; if(v[y][x] < 0.5 && dist[y-1][x] == d - 1){ res.push_back('D'); y--; } else if(v[y+1][x] < 0.5 && dist[y+1][x] == d - 1){ res.push_back('U'); y++; } else if(h[y][x] < 0.5 && dist[y][x-1] == d - 1){ res.push_back('R'); x--; } else if(h[y][x+1] < 0.5 && dist[y][x+1] == d - 1){ res.push_back('L'); x++; } else break; } reverse(res.begin(), res.end()); return res; } struct node{ int y, x, d; node(int y, int x, int d) : y(y), x(x), d(d) {} bool operator> (const node &u) const{ return d > u.d; } }; string dijkstra(){ int dist[20][20]; rep(i,20){ rep(j,20) dist[i][j] = INF; } char par[20][20]; dist[0][0] = 0; priority_queue<node,vector<node>,greater<>> pq; pq.emplace(0, 0, 0); while(!pq.empty()){ node u = pq.top(); pq.pop(); if(dist[u.y][u.x] != u.d) continue; rep(k,4){ int ny = u.y + dy[k], nx = u.x + dx[k]; if(ny < 0 || ny >= 20) continue; if(nx < 0 || nx >= 20) continue; int e = 0; if(k == 0) e = 1.0 / (1.0 - v[u.y][u.x]); else if(k == 1) e = 1.0 / (1.0 - v[u.y+1][u.x]); else if(k == 2) e = 1.0 / (1.0 - h[u.y][u.x]); else e = 1.0 / (1.0 - h[u.y][u.x+1]); int nd = u.d + e; if(dist[ny][nx] <= nd) continue; pq.emplace(ny, nx, nd); dist[ny][nx] = nd; par[ny][nx] = dir[k]; } } int now_y = 19, now_x = 19; string res; while(now_y != 0 || now_x != 0){ char c = par[now_y][now_x]; res += c; if(c == 'U') now_y++; else if(c == 'D') now_y--; else if(c == 'L') now_x++; else now_x--; } return res; } int main(){ int H, W, poss; cin >> H >> W >> poss; assert(H == 20 && W == 20); assert(min_p <= poss && poss <= max_p); double p = poss; p /= 100; rep(i,20){ h[i][0] = 1.0; h[i][20] = 1.0; } rep(j,20){ v[0][j] = 1.0; v[20][j] = 1.0; } rep(i,20){ rep(j,19) h[i][j+1] = 0.2; } rep(i,19){ rep(j,20) v[i+1][j] = 0.2; } rep(trial,1001){ //string ans = bfs(); string ans = dijkstra(); cout << ans << endl; int res; cin >> res; if(res == -1){ cerr << "score = " << 1000 - trial << endl; break; } int y = 0, x = 0; int siz = ans.size(); rep(i,res){ char c = ans[i]; if(c == 'U') v[y][x] = 0, y--; if(c == 'D') v[y+1][x] = 0, y++; if(c == 'L') h[y][x] = 0, x--; if(c == 'R') h[y][x+1] = 0, x++; } if(res < siz){ char c = ans[res]; if(c == 'U' && v[y][x] > eps) v[y][x] = 1.0 - (1.0 - v[y][x]) * p; if(c == 'D' && v[y+1][x] > eps) v[y+1][x] = 1.0 - (1.0 - v[y+1][x]) * p; if(c == 'L' && h[y][x] > eps) h[y][x] = 1.0 - (1.0 - h[y][x]) * p; if(c == 'R' && h[y][x+1] > eps) h[y][x+1] = 1.0 - (1.0 - h[y][x+1]) * p; } } return 0; }