oj.uz

Submission #1040469

# Submission time Handle Problem Language Result Execution time Memory
1040469 2024-08-01T05:30:49 Z joelgun14 Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 662 ms 186456 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define endl "\n"
#define ll long long
#define mp make_pair
#define ins insert
#define lb lower_bound
#define pb push_back
#define ub upper_bound
#define lll __int128
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_multiset;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
int main() {
  ios_base::sync_with_stdio(0); cin.tie(NULL);
  int n, m;
  cin >> n >> m; 
  char a[n + 5][m + 5];
  for(int i = 1; i <= n; ++i)
    for(int j = 1; j <= m; ++j)
      cin >> a[i][j];
  deque<pair<int, pair<int, int>>> bfs;
  bfs.push_back(mp(0, mp(1, 1)));
  bool vis[n + 5][m + 5];
  int res = 0;
  memset(vis, 0, sizeof(vis));
  vector<pair<int, int>> nxt = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
  function<bool(int, int)> check = [&] (int x, int y) -> int {
    return x <= n && x >= 1 && y >= 1 && y <= m;
  };
  while(bfs.size()) {
    int d = bfs.front().fi, x = bfs.front().se.fi, y = bfs.front().se.se;
    bfs.pop_front();
    if(vis[x][y])
      continue;
    vis[x][y] = 1;
    res = max(res, d);
    // cout << x << " " << y << " " << d << endl;
    for(auto p : nxt) {
      if(check(x + p.fi, y + p.se) && !vis[x + p.fi][y + p.se] && a[x + p.fi][y + p.se] != '.') {
        if(a[x + p.fi][y + p.se] == a[x][y])
          bfs.push_front(mp(d, mp(x + p.fi, y + p.se)));
        else
          bfs.pb(mp(d + 1, mp(x + p.fi, y + p.se)));
      }
    }
  }
  cout << res + 1 << endl;
  return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 1112 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 6 ms 1372 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 2 ms 604 KB Output is correct
12 Correct 4 ms 604 KB Output is correct
13 Correct 2 ms 604 KB Output is correct
14 Correct 2 ms 604 KB Output is correct
15 Correct 9 ms 1116 KB Output is correct
16 Correct 12 ms 1116 KB Output is correct
17 Correct 7 ms 1116 KB Output is correct
18 Correct 6 ms 1372 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 604 KB Output is correct
2 Correct 35 ms 4956 KB Output is correct
3 Correct 233 ms 47440 KB Output is correct
4 Correct 50 ms 11344 KB Output is correct
5 Correct 168 ms 26960 KB Output is correct
6 Correct 625 ms 83980 KB Output is correct
7 Correct 1 ms 600 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 2 ms 584 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 604 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 36 ms 4956 KB Output is correct
14 Correct 22 ms 2908 KB Output is correct
15 Correct 17 ms 3164 KB Output is correct
16 Correct 20 ms 2396 KB Output is correct
17 Correct 90 ms 12368 KB Output is correct
18 Correct 60 ms 12208 KB Output is correct
19 Correct 50 ms 11348 KB Output is correct
20 Correct 51 ms 10328 KB Output is correct
21 Correct 139 ms 27732 KB Output is correct
22 Correct 162 ms 26704 KB Output is correct
23 Correct 205 ms 23128 KB Output is correct
24 Correct 136 ms 26960 KB Output is correct
25 Correct 297 ms 47444 KB Output is correct
26 Correct 466 ms 186456 KB Output is correct
27 Correct 544 ms 121848 KB Output is correct
28 Correct 622 ms 83712 KB Output is correct
29 Correct 662 ms 79776 KB Output is correct
30 Correct 591 ms 98856 KB Output is correct
31 Correct 510 ms 31568 KB Output is correct
32 Correct 519 ms 121316 KB Output is correct