void solve() { int n; cin>>n; string s,ss,sss,ssss;//用c的话就是开3个char数组分别存对应的字符按顺序输出即可 cin>>s; for(int i=0;i<n;i++) { if(s[i]>='a'&&s[i]<='z') ss+=s[i]; else if(s[i]>='0'&&s[i]<='9') sss+=s[i]; else ssss+=s[i]; } cout<<ss<<sss<<ssss<<en...