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Submission #584550

# Submission time Handle Problem Language Result Execution time Memory
584550 2022-06-27T14:29:35 Z Kanaifu Miners (IOI07_miners) C++14
92 / 100
 1500 ms 162772 KB 
#include <bits/stdc++.h>

using namespace std;

int arr[100001];

unordered_map<int,int> dp[4][4][4][4];

int n;

int rec(int pos, int last_l, int plast_l, int last_r, int plast_r)
{
    if (pos == n)
    {
        return 0;
    }
    if (dp[last_l][plast_l][last_r][plast_r][pos] != 0)
    {
        return dp[last_l][plast_l][last_r][plast_r][pos];
    }
    int inc = 1;
    if (last_l != arr[pos] and last_l != 0)
    {
        inc++;
    }
    if (plast_l != arr[pos] and plast_l != last_l and plast_l != 0)
    {
        inc++;
    }
    dp[last_l][plast_l][last_r][plast_r][pos] = rec(pos+1, arr[pos], last_l, last_r, plast_r) + inc;

    inc = 1;
    if (last_r != arr[pos] and last_r != 0)
    {
        inc++;
    }
    if (plast_r != arr[pos] and plast_r != last_r and plast_r != 0)
    {
        inc++;
    }
    dp[last_l][plast_l][last_r][plast_r][pos] = max (dp[last_l][plast_l][last_r][plast_r][pos], rec(pos+1, last_l, plast_l, arr[pos], last_r) + inc);
    return dp[last_l][plast_l][last_r][plast_r][pos];
}

int main()
{
    cin>>n;
    for (int i=0; i<n; i++)
    {
        char c;
        cin>>c;
        if (c=='B')
        {
            arr[i] = 1;
        }
        else if (c=='F')
        {
            arr[i] = 2;
        }
        else
        {
            arr[i] = 3;
        }
    }
    cout<<rec(0, 0, 0, 0, 0);
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct

Subtask #4
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct

Subtask #5
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct

Subtask #6
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct

Subtask #7
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 1748 KB Output is correct

Subtask #8
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 4504 KB Output is correct

Subtask #9
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 17324 KB Output is correct

Subtask #10
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 399 ms 37376 KB Output is correct

Subtask #11
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 609 ms 97236 KB Output is correct

Subtask #12
0 / 8.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1573 ms 162772 KB Time limit exceeded
2 Halted 0 ms 0 KB -