Submission #218070

#	Time	Username	Problem	Language	Result	Execution time	Memory
218070		Haunted_Cpp	Awesome Arrowland Adventure (eJOI19_adventure)	C++17	100 / 100	101 ms	5108 KiB

adventure

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <cassert>
#include <string>
#include <cstring>
#include <bitset>
#include <random>
#include <chrono>
 
#define FOR(i, a, b) for(int i = a; i < (int) b; i++)
#define F0R(i, a) FOR (i, 0, a)
#define ROF(i, a, b) for(int i = a; i >= (int) b; i--)
#define R0F(i, a) ROF(i, a, 0)
#define GO(i, a) for (auto i : a)
 
#define rsz resize
#define eb emplace_back
#define pb push_back
#define sz(x) (int) x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define f first
#define s second
 
using namespace std;
 
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vpii;
typedef vector<vi> vvi;
typedef vector<vpii> vvpii;
typedef long long i64;
typedef vector<i64> vi64;
typedef vector<vi64> vvi64;
typedef pair<i64, i64> pi64;
typedef vector<pi64> vpi64;

/*
const int dr[] = {+1, -1, +0, +0, +1, -1, +1, -1};
const int dc[] = {+0, +0, +1, -1, +1, -1, -1, +1};
*/
const int ms[] = {+31, +29, +31, 30, +31, +30, +31, +31, +30, +31, +30, +31};

const int dr[] = {-1, +0, +1, +0};
const int dc[] = {+0, +1, +0, -1};

const char dir[] = {'N', 'E', 'S', 'W'};

const int N = 5e2 + 5;
char g [N][N];
int dist [N][N];

int main () {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int r, c;
  cin >> r >> c;
  if (r == 1 && c == 1) {
    cout << 0 << '\n';
    return 0;
  }
  F0R (i, r) F0R (j, c) cin >> g[i][j];
  F0R (i, r) F0R (j, c) dist[i][j] = 1e9;
  dist[0][0] = 0;
  priority_queue < pair<int, pii> , vector<pair<int, pii> >, greater < pair<int, pii> > > pq;
  pq.push({0, {0, 0}});
  auto Get = [&] (char cur) {
    F0R (i, 4) if (dir[i] == cur) return i;
    return -1;
  };
  while (!pq.empty()) {
    int cost = pq.top().f;
    int linha = pq.top().s.f;
    int coluna = pq.top().s.s;
    pq.pop();
    if (cost > dist[linha][coluna]) continue;
    int cur = Get (g[linha][coluna]);
    if (cur == -1) continue;
    F0R (i, 4) {
      if (linha + dr[i] < 0 || coluna + dc[i] < 0 || linha + dr[i] >= r || coluna + dc[i] >= c) continue;
      int w = 0;
      while ((cur + w) % 4 != i) ++w;
      if (dist[linha + dr[i]][coluna + dc[i]] > dist[linha][coluna] + w) {
        dist[linha + dr[i]][coluna + dc[i]] = dist[linha][coluna] + w;
        pq.push({dist[linha + dr[i]][coluna + dc[i]], {linha + dr[i], coluna + dc[i]}});
      }
    }
  }
  cout << (dist[r - 1][c - 1] > 1e8 ? -1 : dist[r - 1][c - 1]) << '\n';
  return 0;
}

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