Submission #346424

#	Time	Username	Problem	Language	Result	Execution time	Memory
346424		dgq	Miners (IOI07_miners)	C++17	100 / 100	316 ms	896 KiB

miners

#include <bits/stdc++.h>

using namespace std;

const int N = 1e5;

int food[N + 1], dp[2][4][4][4][4];
char str[N + 1];

int nFood;

int score(int a, int b, int c) {
  int ans = 0;
  if (a == 1 || b == 1 || c == 1) {
    ++ans;
  }
  if (a == 2 || b == 2 || c == 2) {
    ++ans;
  }
  if (a == 3 || b == 3 || c == 3) {
    ++ans;
  }
  return ans;
}

int main() {
  scanf("%d", &nFood);
  scanf(" %s", str);
  for (int i = 1; i <= nFood; ++i) {
    char foodchar = str[i - 1];
    switch(foodchar) {
      case 'M':
        food[i] = 1;
        break;
      case 'F':
        food[i] = 2;
        break;
      case 'B':
        food[i] = 3;
        break;
    }
  }

  for (int i = nFood + 1; i >= 1; --i) {
    for (int x1 = 0; x1 <= 3; ++x1) {
      for (int x2 = 0; x2 <= 3; ++x2) {
        for (int y1 = 0; y1 <= 3; ++y1) {
          for (int y2 = 0; y2 <= 3; ++y2) {
            int curr = i % 2;
            int next = curr ^ 1;
            if (i == nFood + 1) {
              dp[curr][x1][x2][y1][y2] = 0;
            } else {
              int send_to_mine1 =
                  score(x1, x2, food[i]) + dp[next][food[i]][x1][y1][y2];
              int send_to_mine2 =
                  score(y1, y2, food[i]) + dp[next][x1][x2][food[i]][y1];
              dp[curr][x1][x2][y1][y2] = max(send_to_mine1, send_to_mine2);
            }
          }
        }
      }
    }
  }
  cout << dp[1][0][0][0][0];
  return 0;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |   scanf("%d", &nFood);
      |   ~~~~~^~~~~~~~~~~~~~
miners.cpp:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 |   scanf(" %s", str);
      |   ~~~~~^~~~~~~~~~~~

• 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