408.cpp

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class Solution {
public:
    bool validWordAbbreviation(string word, string abbr) {
        int i = 0, j = 0, m = word.size(), n = abbr.size();
        while (i < m && j < n) {
            if (abbr[j] >= '0' && abbr[j] <= '9') {
                if (abbr[j] == '0') return false;
                int val = 0;
                while (j < n && abbr[j] >= '0' && abbr[j] <= '9') {
                    val = val * 10 + abbr[j++] - '0';
                }
                i += val;
            } else {
                if (word[i++] != abbr[j++]) return false;
            }
        }
        return i == m && j == n;
    }
};
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class Solution {
public:
    bool validWordAbbreviation(string word, string abbr) {
        int m = word.size(), n = abbr.size(), p = 0, cnt = 0;
        for (int i = 0; i < abbr.size(); ++i) {
            if (abbr[i] >= '0' && abbr[i] <= '9') {
                if (cnt == 0 && abbr[i] == '0') return false;
                cnt = 10 * cnt + abbr[i] - '0';
            } else {
                p += cnt;
                if (p >= m || word[p++] != abbr[i]) return false;
                cnt = 0;
            }
        }
        return p + cnt == m;
    }
};
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