Number of Different Integers in a String.cpp

// Runtime: 3 ms (Top 68.35%) | Memory: 6.5 MB (Top 93.46%)
class Solution {
public:
    int numDifferentIntegers(string word) {
        unordered_map<string, int> hmap;
        for (int i = 0; i < word.size(); i++) {
            if (isdigit(word[i])) {
                string str;
                while (word[i] == '0')
                    i++;
                while (isdigit(word[i]))
                    str += word[i++];
                hmap[str]++;
            }
        }
        return hmap.size();
    }
};