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Submission #469457

# Submission time Handle Problem Language Result Execution time Memory
469457 2021-09-01T03:43:58 Z flashmt Miners (IOI07_miners) C++17
100 / 100
 578 ms 604 KB 
#include <bits/stdc++.h>
using namespace std;
const int oo = 1 << 30;

int main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, m[256];
  string s;
  cin >> n >> s;
  m['M'] = 0;
  m['F'] = 1;
  m['B'] = 2;

  auto cost = [&](int x, int y, int z)
  {
    return __builtin_popcount(1 << x | 1 << y | 1 << z);
  };

  vector<vector<vector<vector<int>>>> f(4, vector<vector<vector<int>>>(4, vector<vector<int>>(4, vector<int>(4, -oo))));
  f[3][3][3][3] = 0;
  for (int i = 0; i < n; i++)
  {
    int x = m[s[i]];
    vector<vector<vector<vector<int>>>> newF(4, vector<vector<vector<int>>>(4, vector<vector<int>>(4, vector<int>(4, -oo))));
    for (int p = 0; p < 10; p++)
      for (int q = 0; q < 10; q++)
        if (p != 9 || q != 9 || !i)
        {
          int a = p / 3, b = p % 3;
          int c = q / 3, d = q % 3;
          if (p == 9 && q == 9) newF[3][3][x][x] = newF[x][x][3][3] = 1;
          else if (p == 9)
          {
            newF[x][x][c][d] = max(newF[x][x][c][d], f[3][3][c][d] + 1);
            newF[3][3][d][x] = max(newF[3][3][d][x], f[3][3][c][d] + cost(c, d, x));
          }
          else if (q == 9)
          {
            newF[a][b][x][x] = max(newF[a][b][x][x], f[a][b][3][3] + 1);
            newF[b][x][3][3] = max(newF[b][x][3][3], f[a][b][3][3] + cost(a, b, x));
          }
          else
          {
            newF[b][x][c][d] = max(newF[b][x][c][d], f[a][b][c][d] + cost(a, b, x));
            newF[a][b][d][x] = max(newF[a][b][d][x], f[a][b][c][d] + cost(c, d, x));
          }
        }

    swap(f, newF);
  }

  int ans = n;
  for (int i = 0; i < 4; i++)
    for (int j = 0; j < 4; j++)
      for (int p = 0; p < 4; p++)
        for (int q = 0; q < 4; q++)
          ans = max(ans, f[i][j][p][q]);

  cout << ans << endl;
}

Compilation message

miners.cpp: In function 'int main()':
miners.cpp:25:19: warning: array subscript has type 'char' [-Wchar-subscripts]
   25 |     int x = m[s[i]];
      |                   ^

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #4
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #5
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #6
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #7
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 204 KB Output is correct

Subtask #8
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 316 KB Output is correct

Subtask #9
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 56 ms 324 KB Output is correct

Subtask #10
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 144 ms 372 KB Output is correct

Subtask #11
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 417 ms 552 KB Output is correct

Subtask #12
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 578 ms 604 KB Output is correct