이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#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);
}
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