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  1. /*----10-12-2023----*/
  2. #include <bits/stdc++.h>
  3. #define TIME (1.0 * clock() / CLOCKS_PER_SEC)
  4. #define BIT(x, i) (1 & ((x) >> (i)))
  5. #define OFF(x, i) ((x) ^ (1 << (i)))
  6. #define ON(x, i) ((x) | (1 << (i)))
  7. #define MASK(x) (1 << (x))
  8. #define CNT(x) __builtin_popcountll(x)
  9. #define ALL(x) x.begin(), x.end()
  10. // #define int long long
  11. #define For(x, a, b)                       \
  12.     for (int x = a; x <= b; x++)
  13. #define Rep(x, a, b)                       \
  14.     for (int x = a; x >= b; x--)
  15. #define file(name)                         \
  16.     if (fopen(name ".inp", "r"))           \
  17.     {                                      \
  18.         freopen(name ".inp", "r", stdin);  \
  19.         freopen(name ".out", "w", stdout); \
  20.     }
  21. #define faster                             \
  22.     ios_base::sync_with_stdio(0);          \
  23.     cin.tie(0);                            \
  24.     cout.tie(0);
  25. using namespace std;
  26.  
  27. const int inf = 1e9;
  28. const double pi = acos(-1);
  29. const int N = 2e3 + 5;
  30.  
  31. int n, m;
  32. char a[N][N];
  33. int x[N][N], y[N][N], z[N][N];
  34. int res[N][N];
  35. priority_queue<pair<int, int>> q;
  36.  
  37. void clear(priority_queue<pair<int, int>>& x) { while (!x.empty()) x.pop(); }
  38.  
  39. void code() {
  40.     cin >> n >> m;
  41.     For(i, 1, n) For(j, 1, m) cin >> a[i][j];
  42.     Rep(i, n, 1) Rep(j, m, 1) {
  43.         x[i][j] = a[i][j] != '#' ? x[i][j + 1] + 1 : 0;
  44.         y[i][j] = a[i][j] != '#' ? y[i + 1][j] + 1 : 0;
  45.         z[i][j] = min({ z[i + 1][j + 1] + 1, x[i][j], y[i][j] });
  46.     }
  47.     For(i, 1, n) For(j, 1, m) {
  48.         if (j == 1) clear(q);
  49.         while (q.size() && q.top().second + q.top().first <= j) q.pop();
  50.         q.push({ z[i][j], j });
  51.         res[i][j] = max(res[i][j], q.top().first * q.top().first);
  52.     }
  53.     For(i, 1, m) For(j, 1, n) {
  54.         if (j == 1) clear(q);
  55.         while (q.size() && q.top().second + q.top().first <= j) q.pop();
  56.         q.push({ sqrt(res[j][i]), j });
  57.         res[j][i] = max(res[j][i], q.top().first * q.top().first);
  58.     }
  59.     int t, i, j;
  60.     cin >> t;
  61.     while (t--) { cin >> i >> j, cout << res[i][j] << "\n"; }
  62. }
  63.  
  64. main() {
  65.     faster;
  66.     file("square");
  67.     int t = 1;
  68.     // cin >> t;
  69.     while (t--) code();
  70.     ofstream time("_.time");
  71.     time << TIME << 's';
  72.     return 0;
  73. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/qDwfVt
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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