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#include <iostream> #include <map> #include <cstring> using namespace std; string s; int n; map<pair<char, char>, bool> mapping; int dp[222][222]; int rec(int i, int j) { if(j - i <= 1) { return 0; } if(dp[i][j] != -1) { return dp[i][j]; } int result = 0; if(mapping[make_pair(s[i], s[j])]) { result = max(result, rec(i + 1, j - 1) + 1); } for(int k = i; k < j; k++) { result = max(result, rec(i, k) + rec(k + 1, j)); } return dp[i][j] = result; } int main() { ios_base::sync_with_stdio(false); cin >> n >> s; mapping[make_pair('A', 'U')] = true; mapping[make_pair('U', 'A')] = true; mapping[make_pair('C', 'G')] = true; mapping[make_pair('G', 'C')] = true; mapping[make_pair('G', 'U')] = true; mapping[make_pair('U', 'G')] = true; memset(dp, -1, sizeof dp); cout << rec(0, n - 1) << endl; return 0; }
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