oj.uz

Submission #51616

# Submission time Handle Problem Language Result Execution time Memory
51616 2018-06-19T08:18:24 Z model_code Miners (IOI07_miners) C++17
100 / 100
 25 ms 620 KB 
#include <cstdio>
#include <cstdlib>
#include <algorithm>
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

miners.cpp: In function 'int main()':
miners.cpp:40:64: warning: array subscript has type 'char' [-Wchar-subscripts]
               int left = ore(s[k], s[k-1], a) + dp[prev][s[k-1]][b][c];
                                                                ^
miners.cpp:41:63: warning: array subscript has type 'char' [-Wchar-subscripts]
               int right = ore(s[k], b, c) + dp[prev][b][s[k-1]][a];
                                                               ^
miners.cpp: In function 'void read_input()':
miners.cpp:13:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d\n", &n);
   ~~~~~^~~~~~~~~~~~
miners.cpp:14:8: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   fgets(s, MAX+1, stdin);
   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 480 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 564 KB Output is correct

Subtask #4
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 564 KB Output is correct

Subtask #5
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 564 KB Output is correct

Subtask #6
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 564 KB Output is correct

Subtask #7
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 564 KB Output is correct

Subtask #8
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 564 KB Output is correct

Subtask #9
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 564 KB Output is correct

Subtask #10
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 600 KB Output is correct

Subtask #11
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 620 KB Output is correct

Subtask #12
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 620 KB Output is correct