Submission #896643

#	Time	Username	Problem	Language	Result	Execution time	Memory
896643		tgp07	Tracks in the Snow (BOI13_tracks)	C++17	Compilation error	0 ms	0 KiB

tracks

#include <iostream>
#include <fstream>
#include <algorithm>
#include <stack>
#include <map>
#include <queue>
#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";
}

Compilation message (stderr)

tracks.cpp: In function 'int main()':
tracks.cpp:36:6: error: 'memset' was not declared in this scope
   36 |      memset(dist, -1, sizeof(dist));
      |      ^~~~~~
tracks.cpp:11:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
   10 | #include <set>
  +++ |+#include <cstring>
   11 | using namespace std;