Leetcode 244 Solution

This article provides solution to leetcode question 244 (shortest-word-distance-ii)
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https://leetcode.com/problems/shortest-word-distance-ii

Solution

class WordDistance {
    unordered_map<string, vector<int>> a;

public:
    WordDistance(vector<string> words) {
        for (int i = 0; i < words.size(); i++)
            a[words[i]].push_back(i);
    }

    int shortest(string word1, string word2) {
        auto& v1 = a[word1];
        auto& v2 = a[word2];

        int i1 = 0;
        int i2 = 0;

        int min_val = INT_MAX;
        while (i1 < v1.size() && i2 < v2.size())
        {
            min_val = min(min_val, (int)abs(v1[i1] - v2[i2]));

            if (v1[i1] > v2[i2])
                i2++;
            else
                i1++;
        }

        return min_val;
    }
};

/**
 * Your WordDistance object will be instantiated and called as such:
 * WordDistance obj = new WordDistance(words);
 * int param_1 = obj.shortest(word1,word2);
 */