Submission #248718

#	Time	Username	Problem	Language	Result	Execution time	Memory
248718		WLZ	Miners (IOI07_miners)	C++14	100 / 100	1143 ms	101088 KiB

miners

#include <bits/stdc++.h>
using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  string s;
  cin >> s;
  map<char, int> mp = {{'M', 1}, {'B', 2}, {'F', 3}};
  int dp[n + 1][4][4][4][4];
  memset(dp, -1, sizeof dp);

  auto f = [](int a, int b, int c) {
    set<int> st;
    if (a != 0) {
      st.insert(a);
    }
    if (b != 0) {
      st.insert(b);
    }
    if (c != 0) {
      st.insert(c);
    }
    return (int) st.size();
  };

  dp[0][0][0][0][0] = 0;
  for (int i = 1; i <= n; i++) {
    for (int a = 0; a < 4; a++) {
      for (int b = 0; b < 4; b++) {
        for (int c = 0; c < 4; c++) {
          for (int d = 0; d < 4; d++) {
            if (dp[i - 1][a][b][c][d] == -1) {
              continue;
            }
            dp[i][b][mp[s[i - 1]]][c][d] = max(dp[i][b][mp[s[i - 1]]][c][d], dp[i - 1][a][b][c][d] + f(a, b, mp[s[i - 1]]));
            dp[i][a][b][d][mp[s[i - 1]]] = max(dp[i][a][b][d][mp[s[i - 1]]], dp[i - 1][a][b][c][d] + f(c, d, mp[s[i - 1]]));
          }
        }
      }
    }
  }
  int ans = 0;
  for (int a = 0; a < 4; a++) {
    for (int b = 0; b < 4; b++) {
      for (int c = 0; c < 4; c++) {
        for (int d = 0; d < 4; d++) {
          ans = max(ans, dp[n][a][b][c][d]);
        }
      }
    }
  }
  cout << ans << '\n';
  return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 8 / 8
• Subtask 11: 8 / 8
• Subtask 12: 8 / 8