oj.uz

Submission #1012941

# Submission time Handle Problem Language Result Execution time Memory
1012941 2024-07-02T22:35:44 Z parentoni Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 402 ms 235728 KB 
#include <bits/stdc++.h>
using namespace std;

#define all(x) (x).begin(), (x).end()
#define print(x) for (auto el: x) cout << el << " "; cout << '\n'

using ll = long long;
using llb = long double;
using vl = vector<ll>;
using pll = pair<ll,ll>;

// functions
void setIO(string s) {freopen((s + ".in").c_str(), "r", stdin);freopen((s + ".out").c_str(), "w", stdout);}
void yes() { cout<<"YES\n"; }
void no() { cout<<"NO\n"; }

// geometry
const double PI = 3.14159265358979323846;
double DEG_to_RAD (double d) {return d*PI/180.0;}
double RAD_to_DEG (double r) {return r*180.0/ PI;}

// values
const ll INF = 1e18;
const ll MOD = 1000000007;
const ll MAX_N = 4000;
ll h, w;

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

string board[4000];
ll depth[4000][4000];


deque<pll> q;

bool inside(ll x, ll y) {
  return (x >= 0 && x < h && y >=0 && y < w && board[x][y] != '.');
}
ll bfs() {

  ll ans = 1;
  depth[0][0] = 1;

  q.push_back({0,0});
  while(q.size()) {

    pll a = q.front();
    q.pop_front();
    ans = max(ans, depth[a.first][a.second]);
    for (int i=0;i<4;i++) {
      ll x = a.first + dx[i], y = a.second +dy[i];
      if (!depth[x][y] && inside(x, y)) {
        if (board[a.first][a.second] != board[x][y]) {
          q.push_back({x,y});
          depth[x][y] = depth[a.first][a.second] + 1;
        } else {
          q.push_front({x,y});
          depth[x][y] = depth[a.first][a.second];
        }
      }
    }
  }

  return ans;
}

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);

  cin >> h >> w; 
 

  for (int i=0;i<h;i++) {
    cin >> board[i];
  }

  cout << bfs() << "\n";
}

Compilation message

tracks.cpp: In function 'void setIO(std::string)':
tracks.cpp:13:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 | void setIO(string s) {freopen((s + ".in").c_str(), "r", stdin);freopen((s + ".out").c_str(), "w", stdout);}
      |                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tracks.cpp:13:71: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 | void setIO(string s) {freopen((s + ".in").c_str(), "r", stdin);freopen((s + ".out").c_str(), "w", stdout);}
      |                                                                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 4956 KB Output is correct
2 Correct 0 ms 604 KB Output is correct
3 Correct 0 ms 604 KB Output is correct
4 Correct 4 ms 4472 KB Output is correct
5 Correct 2 ms 2396 KB Output is correct
6 Correct 0 ms 592 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 860 KB Output is correct
9 Correct 1 ms 860 KB Output is correct
10 Correct 2 ms 1880 KB Output is correct
11 Correct 2 ms 1884 KB Output is correct
12 Correct 4 ms 2652 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 2 ms 2396 KB Output is correct
15 Correct 7 ms 4616 KB Output is correct
16 Correct 9 ms 4956 KB Output is correct
17 Correct 7 ms 4700 KB Output is correct
18 Correct 4 ms 4444 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 15964 KB Output is correct
2 Correct 27 ms 15440 KB Output is correct
3 Correct 126 ms 93420 KB Output is correct
4 Correct 50 ms 43092 KB Output is correct
5 Correct 124 ms 69320 KB Output is correct
6 Correct 402 ms 186116 KB Output is correct
7 Correct 7 ms 16732 KB Output is correct
8 Correct 6 ms 15964 KB Output is correct
9 Correct 1 ms 1116 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 7 ms 16476 KB Output is correct
12 Correct 1 ms 1372 KB Output is correct
13 Correct 29 ms 15188 KB Output is correct
14 Correct 18 ms 10076 KB Output is correct
15 Correct 13 ms 14172 KB Output is correct
16 Correct 13 ms 6464 KB Output is correct
17 Correct 68 ms 32856 KB Output is correct
18 Correct 54 ms 47692 KB Output is correct
19 Correct 47 ms 43088 KB Output is correct
20 Correct 35 ms 27220 KB Output is correct
21 Correct 87 ms 60968 KB Output is correct
22 Correct 124 ms 69284 KB Output is correct
23 Correct 131 ms 56376 KB Output is correct
24 Correct 91 ms 59500 KB Output is correct
25 Correct 224 ms 158880 KB Output is correct
26 Correct 213 ms 235728 KB Output is correct
27 Correct 266 ms 212292 KB Output is correct
28 Correct 351 ms 185936 KB Output is correct
29 Correct 374 ms 183004 KB Output is correct
30 Correct 323 ms 191640 KB Output is correct
31 Correct 312 ms 115352 KB Output is correct
32 Correct 237 ms 183464 KB Output is correct