Submission #317039

#	Time	Username	Problem	Language	Result	Execution time	Memory
317039		casperwang	Maxcomp (info1cup18_maxcomp)	C++14	60 / 100	980 ms	24168 KiB

maxcomp

#include <bits/stdc++.h>
#define pb push_back
#define pii pair<int,int>
#define pip pair<int,pii>
#define ff first
#define ss second
using namespace std;

const int MAXN = 1000;

signed main() {
  ios_base::sync_with_stdio(0), cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector <vector<int>> arr(n);
  vector <pip> ord;
  for (int i = 0; i < n; i++) {
    arr[i].resize(m);
    for (int j = 0; j < m; j++) {
      cin >> arr[i][j];
      ord.pb(pip(arr[i][j], pii(i, j)));
    }
  }
  sort(ord.begin(), ord.end(), greater<pip>());
  int ans = -1;
  for (int i = 0; i < n * m; i++) {
    if (ord[i].ff + (n+m) < ord[0].ff) break;
    queue <pii> bfs;
    vector <vector<bool>> vis(n);
    vector <vector<int>> dis(n), mmin(n);
    for (int j = 0; j < n; j++)
      vis[j].resize(m), dis[j].resize(m), mmin[j].resize(m);
    bfs.push(ord[i].ss);
    vis[ord[i].ss.ff][ord[i].ss.ss] = 1;
    dis[ord[i].ss.ff][ord[i].ss.ss] = 1;
    mmin[ord[i].ss.ff][ord[i].ss.ss] = ord[i].ff;
    int val = ord[i].ff;
    while (i+1 < n * m && ord[i+1].ff == ord[i].ff) {
      bfs.push(ord[++i].ss);
      vis[ord[i].ss.ff][ord[i].ss.ss] = 1;
      dis[ord[i].ss.ff][ord[i].ss.ss] = 1;
      mmin[ord[i].ss.ff][ord[i].ss.ss] = ord[i].ff;
    }
    vector <int> dx = {0, 1, -1, 0}, dy = {1, 0, 0, -1};
    while (bfs.size() || bfs.size() > n*m) {
      pii w = bfs.front();
      bfs.pop();
      for (int j = 0; j < 4; j++) {
        int x = w.ff + dx[j], y = w.ss + dy[j];
        if (x >= n || x < 0 || y >= m || y < 0) continue;
        if (!vis[x][y]) {
          vis[x][y] = 1;
          dis[x][y] = dis[w.ff][w.ss] + 1;
          mmin[x][y] = min(arr[x][y], mmin[w.ff][w.ss]);
          ans = max(ans, val - mmin[x][y] - dis[x][y]);
          bfs.push(pii(x, y));
        }
      }
    }
  }
  cout << ans << "\n";
}

Compilation message (stderr)

maxcomp.cpp: In function 'int main()':
maxcomp.cpp:45:37: warning: comparison of integer expressions of different signedness: 'std::queue<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   45 |     while (bfs.size() || bfs.size() > n*m) {
      |                          ~~~~~~~~~~~^~~~~

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 30 / 30
• Subtask 4: 0 / 40