int get_min_count(string &;s){ int len_s = s.length(); //cout << len_s; s = " "+s; int res = INT_MAX; vector<int> dp_r(len_s+1,0); vector<int> dp_e(len_s+1,0); vector<int> dp_d(len_s+1,0); for(int i=1;i<=len_s;i++){ if(s[i]=='r'){ dp_r[i] = min(dp_e[i-1],dp_d[i-1]); dp_e[i] = min(dp_r[i-1]+1,dp_d[i-1]+1); dp_d[i] = min(dp_r[i-1]+2,dp_e[i-1]+2); }else if(s[i]=='e'){ dp_r[i] = min(dp_e[i-1]+2,dp_d[i-1]+2); dp_e[i] = min(dp_r[i-1],dp_d[i-1]); dp_d[i] = min(dp_r[i-1]+1,dp_e[i-1]+1); }else{ dp_r[i] = min(dp_e[i-1]+1,dp_d[i-1]+1); dp_e[i] = min(dp_r[i-1]+2,dp_d[i-1]+2); dp_d[i] = min(dp_e[i-1],dp_r[i-1]); } } res = min(dp_r[len_s],dp_d[len_s]); res = min(res,dp_e[len_s]); return res; }