int d[27]={0};
for (int i = 0; i < str.length(); i++) //AABBCC
d[str[i] - 'A']++;
for (int i = 0; i < str.length(); i++)
if (d[str[i] - 'A'] != 0) {
cout << str[i] << " "<< d[str[i] - 'A'] << " "; //A 2 B 2 C 2
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