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# Author Problem Lang Verdict Time Memory Sent Judged  
77282904 Practice:
jajantaram
1321C - 19 GNU C++17 Time limit exceeded on test 9 2000 ms 77288 KB 2020-04-19 17:12:44 2020-04-19 17:12:44
 
 
→ Source
#include<bits/stdc++.h>
using namespace std;

int n;
unordered_map<string,int>dp;

bool isvalid(int pos,int size)
{
    if(pos<0||pos>=size)
        return false;
    return true;
}

int rec(string s)
{
    if(s.size()==0)
        return 0;
    if(dp[s]!=0)
        return dp[s];
    int i,m=0;
    for(i=0;i<s.size();i++)
    {
        if((isvalid(i-1,s.size())&&s[i]-s[i-1]==1)||(isvalid(i+1,s.size())&&s[i]-s[i+1]==1))
        {
            string a=s;
            a.erase(a.begin()+i);
            m=max(m,1+rec(a));
        }
    }
    return dp[s]=m;
}

int main()
{
    cin>>n;
    string s;
    cin>>s;
    cout<<rec(s);
}
 
 
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