Submission #942478

#	Time	Username	Problem	Language	Result	Execution time	Memory
942478		artixkrishna	Miners (IOI07_miners)	C++14	100 / 100	19 ms	620 KiB

miners

#include <algorithm>
#include <cstdio>
#include <cstdlib>
using namespace std;

const int MAX = 100005;

int n;
char s[MAX + 1];
int dp[2][4][4][4];

void read_input() {
  scanf("%d\n", &n);
  fgets(s, MAX + 1, stdin);
  for (int i = 0; i < n; i++)
    if (s[i] == 'F')
      s[i] = 1;
    else if (s[i] == 'M')
      s[i] = 2;
    else
      s[i] = 3;
}

inline int ore(int a, int b, int c) {
  int sol = 0;
  if (a == 1 || b == 1 || c == 1)
    sol++;
  if (a == 2 || b == 2 || c == 2)
    sol++;
  if (a == 3 || b == 3 || c == 3)
    sol++;
  return sol;
}

int main() {
  read_input();

  int now = 0, prev = 1;
  for (int k = n - 1; k >= 0; --k) {
    for (int a = 0; a <= 3; ++a) {
      for (int b = 0; b <= 3; ++b) {
        for (int c = 0; c <= 3; ++c) {
          int left = ore(s[k], s[k - 1], a) + dp[prev][s[k - 1]][b][c];
          int right = ore(s[k], b, c) + dp[prev][b][s[k - 1]][a];
          dp[now][a][b][c] = max(left, right);
        }
      }
    }

    swap(now, prev);
  }
  printf("%d\n", dp[prev][0][0][0]);
  return 0;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:44:63: warning: array subscript has type 'char' [-Wchar-subscripts]
   44 |           int left = ore(s[k], s[k - 1], a) + dp[prev][s[k - 1]][b][c];
      |                                                        ~~~~~~~^
miners.cpp:45:60: warning: array subscript has type 'char' [-Wchar-subscripts]
   45 |           int right = ore(s[k], b, c) + dp[prev][b][s[k - 1]][a];
      |                                                     ~~~~~~~^
miners.cpp: In function 'void read_input()':
miners.cpp:14:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |   scanf("%d\n", &n);
      |   ~~~~~^~~~~~~~~~~~
miners.cpp:15:8: warning: ignoring return value of 'char* fgets(char*, int, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   fgets(s, MAX + 1, stdin);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~

• 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