Submission #260123

#	Time	Username	Problem	Language	Result	Execution time	Memory
260123		jdh	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	38 / 100	1 ms	384 KiB

adventure

#include <bits/stdc++.h>
using namespace std;
map<char,int> mp = { {'N',0},{'E',1},{'S',2},{'W',3} };
vector<tuple<int,int,char>> dirs = { {-1,0,'N'},{0,1,'E'},{1,0,'S'},{0,-1,'W'} };
int main(){
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n,m;
  cin >> n >> m;
  vector<string> vs(n);
  for(int i = 0; i < n; ++i) cin >> vs[i];
  vector<vector<int>> val(n,vector<int>(m,-1));
  set<tuple<int,int,int>> sp;
  sp.emplace(0,0,0);
  while(!sp.empty()){
    int a,x,y;
    tie(a,x,y) = *begin(sp);
    sp.erase(begin(sp));
    if(x == n-1 and y == m-1){
      cout << a;
      return 0;
    }
    if(val[x][y] == -1){
      val[x][y] = a;
      for(auto& dir : dirs){
        int dx,dy;
        char d;
        tie(dx,dy,d) = dir;
        int x1 = x+dx,y1 = y+dy;
        if(0 <= x1 and x1 < n and 0 <= y1 and y1 < m){
          if(val[x1][y1] == -1){
            if(vs[x1][y1] != 'X' or (x1 == n-1 and y1 == m-1)){
              int delta = (mp[d]+4-mp[vs[x][y]])%4;
              sp.emplace(a+delta,x1,y1);
            }
          }
        }
      }
    }
  }
  cout << -1;
  return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 0 / 12
• Subtask 4: 16 / 16
• Subtask 5: 0 / 50