class Solution { public: string replaceDigits(string s) { int n=s.size(); string p=""; for(int i=0;i<n;i++) { if((s[i]-'0')>=0 && (s[i]-'0')<=9) { p+=(s[i-1]+(s[i]-'0')); } else { p+=s[i]; } } return p; } };
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