How do I check if multiple letters exist in a string in C++

Question

例如，在字符串“ RADIOACTIVE”中，如何检查字符串中是否所有“ R”，“ E”，“ O”和“ A”都出现。我应该如何编写男女同校

Answer 1

Find out which letters are available in your main string. Then check each letter you want whether they are available or not.

string S = "RADIOACTIVE";
bool avail[26]={false};
for(int i=0; i<S.length(); i++)
  avail[S[i]] = true;


string s = "REOA";
bool All = true;

for(int i=0; i<s.length(); i++)
    if(!avail[s[i]])
    {
        All = false;
        break;
    }


if(All)
  cout << "All letters found" << endl;
else
  cout << "All letters not found" << endl;