oj.uz

Submission #896644

# Submission time Handle Problem Language Result Execution time Memory
896644 2024-01-01T20:03:41 Z tgp07 Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 1492 ms 716052 KB 
#include <iostream>
#include <fstream>
#include <algorithm>
#include <stack>
#include <map>
#include <queue>
#include <cstring>
#include <numeric>
#include <string>
#include <bitset>
#include <set>
using namespace std;

typedef long long ll;

const ll MOD = 1e9 + 7;

ll dr[4] = {0, 1, 0, -1};
ll dc[4] = {1, 0, -1, 0};

int main()
{
     cin.tie(0) -> sync_with_stdio(0);
     
     ll h, w;
     cin >> h >> w;
     
     string grid[h];
     for (ll i = 0; i < h; i++) {
          cin >> grid[i];
     }
     
     deque<pair<pair<ll, ll>, ll>> q;
     q.push_front({{0, 0}, 1});
     
     ll dist[h][w];
     memset(dist, -1, sizeof(dist));
     
     while (!q.empty()) {
          pair<pair<ll, ll>, ll> cur = q.front();
          q.pop_front();
          
          if (dist[cur.first.first][cur.first.second] != -1) {
               continue;
          }
          
          dist[cur.first.first][cur.first.second] = cur.second;
          
          for (ll i = 0; i < 4; i++) {
               ll nr = cur.first.first+dr[i];
               ll nc = cur.first.second+dc[i];
               if (nr>=0 && nr<h && nc>=0 && nc<w && grid[nr][nc]!='.') {
                    if (grid[cur.first.first][cur.first.second] != grid[nr][nc]) {
                         q.push_back({{nr, nc}, cur.second+1});
                    } else {
                         q.push_front({{nr, nc}, cur.second});
                    }
               }
          }
     }
     
     ll ans = 0;
     for (ll i=0; i<h; i++) {
          for (ll j=0; j<w; j++) {
               ans=max(ans,dist[i][j]);
          }
     }
     
     cout<<ans<<"\n";
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 3416 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 10 ms 3416 KB Output is correct
5 Correct 2 ms 1116 KB Output is correct
6 Correct 1 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 1116 KB Output is correct
11 Correct 4 ms 1116 KB Output is correct
12 Correct 6 ms 1628 KB Output is correct
13 Correct 2 ms 1116 KB Output is correct
14 Correct 2 ms 1116 KB Output is correct
15 Correct 17 ms 3164 KB Output is correct
16 Correct 21 ms 3420 KB Output is correct
17 Correct 9 ms 2908 KB Output is correct
18 Correct 10 ms 3436 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 860 KB Output is correct
2 Correct 45 ms 15860 KB Output is correct
3 Correct 271 ms 159172 KB Output is correct
4 Correct 70 ms 37508 KB Output is correct
5 Correct 135 ms 89456 KB Output is correct
6 Correct 1445 ms 261520 KB Output is correct
7 Correct 1 ms 860 KB Output is correct
8 Correct 1 ms 856 KB Output is correct
9 Correct 3 ms 1112 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 1 ms 860 KB Output is correct
12 Correct 1 ms 604 KB Output is correct
13 Correct 45 ms 15964 KB Output is correct
14 Correct 26 ms 9308 KB Output is correct
15 Correct 15 ms 10076 KB Output is correct
16 Correct 24 ms 6744 KB Output is correct
17 Correct 119 ms 40784 KB Output is correct
18 Correct 76 ms 39764 KB Output is correct
19 Correct 68 ms 37504 KB Output is correct
20 Correct 61 ms 34384 KB Output is correct
21 Correct 161 ms 92404 KB Output is correct
22 Correct 127 ms 89428 KB Output is correct
23 Correct 231 ms 77204 KB Output is correct
24 Correct 135 ms 90172 KB Output is correct
25 Correct 485 ms 159120 KB Output is correct
26 Correct 1492 ms 716052 KB Output is correct
27 Correct 1326 ms 443492 KB Output is correct
28 Correct 1320 ms 261936 KB Output is correct
29 Correct 1327 ms 257500 KB Output is correct
30 Correct 1288 ms 323264 KB Output is correct
31 Correct 680 ms 106680 KB Output is correct
32 Correct 1254 ms 435212 KB Output is correct