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Submission #366054

# Submission time Handle Problem Language Result Execution time Memory
366054 2021-02-12T21:05:53 Z Traingle Tracks in the Snow (BOI13_tracks) C++14
100 / 100
 687 ms 130852 KB 
#include <bits/stdc++.h>
using namespace std;

int dx[4] = {1, -1, 0, 0}, dy[4] = {0, 0, 1, -1};

int n, m, depth[4000][4000], ans = 1;
string snow[4000];

bool inside(int x, int y) {
  return (x > -1 && x < n && y > -1 && y < m && snow[x][y] != '.');
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n >> m;
  for (int i = 0; i < n; ++i) {
    cin >> snow[i];
  }
  deque<pair<int, int>> q;
  q.push_back({0, 0});
  depth[0][0] = 1;
  while (!q.empty()) {
    pair<int, int> c = q.front();
    q.pop_front();
    ans = max(ans, depth[c.first][c.second]);
    for (int i = 0; i < 4; ++i) {
      int x = c.first + dx[i];
      int y = c.second + dy[i];
      if (inside(x, y) && depth[x][y] == 0) {
        if (snow[x][y] == snow[c.first][c.second]) {
          depth[x][y] = depth[c.first][c.second];
          q.push_front({x, y});
        }
        else {
          depth[x][y] = depth[c.first][c.second] + 1;
          q.push_back({x, y});
        }
      }
    }
  }
  cout << ans << endl;
  return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 3948 KB Output is correct
2 Correct 1 ms 512 KB Output is correct
3 Correct 1 ms 620 KB Output is correct
4 Correct 8 ms 3564 KB Output is correct
5 Correct 3 ms 2028 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 620 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 876 KB Output is correct
10 Correct 3 ms 1772 KB Output is correct
11 Correct 3 ms 1516 KB Output is correct
12 Correct 7 ms 2156 KB Output is correct
13 Correct 3 ms 2028 KB Output is correct
14 Correct 4 ms 2048 KB Output is correct
15 Correct 15 ms 3692 KB Output is correct
16 Correct 14 ms 3948 KB Output is correct
17 Correct 10 ms 3692 KB Output is correct
18 Correct 9 ms 3564 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 15852 KB Output is correct
2 Correct 45 ms 12012 KB Output is correct
3 Correct 232 ms 75464 KB Output is correct
4 Correct 76 ms 29452 KB Output is correct
5 Correct 196 ms 51324 KB Output is correct
6 Correct 687 ms 109772 KB Output is correct
7 Correct 13 ms 16620 KB Output is correct
8 Correct 13 ms 15852 KB Output is correct
9 Correct 2 ms 876 KB Output is correct
10 Correct 1 ms 620 KB Output is correct
11 Correct 13 ms 16364 KB Output is correct
12 Correct 2 ms 1260 KB Output is correct
13 Correct 45 ms 12012 KB Output is correct
14 Correct 26 ms 7916 KB Output is correct
15 Correct 23 ms 10348 KB Output is correct
16 Correct 21 ms 4972 KB Output is correct
17 Correct 125 ms 25324 KB Output is correct
18 Correct 94 ms 32108 KB Output is correct
19 Correct 80 ms 29420 KB Output is correct
20 Correct 61 ms 22508 KB Output is correct
21 Correct 144 ms 50796 KB Output is correct
22 Correct 197 ms 51564 KB Output is correct
23 Correct 234 ms 42220 KB Output is correct
24 Correct 144 ms 47596 KB Output is correct
25 Correct 465 ms 96364 KB Output is correct
26 Correct 429 ms 130852 KB Output is correct
27 Correct 574 ms 122984 KB Output is correct
28 Correct 685 ms 109956 KB Output is correct
29 Correct 684 ms 108436 KB Output is correct
30 Correct 665 ms 112428 KB Output is correct
31 Correct 562 ms 72172 KB Output is correct
32 Correct 494 ms 108436 KB Output is correct