Formatted question description: https://leetcode.ca/all/1023.html

1023. Camelcase Matching (Medium)

A query word matches a given pattern if we can insert lowercase letters to the pattern word so that it equals the query. (We may insert each character at any position, and may insert 0 characters.)

Given a list of queries, and a pattern, return an answer list of booleans, where answer[i] is true if and only if queries[i] matches the pattern.

 

Example 1:

Input: queries = ["FooBar","FooBarTest","FootBall","FrameBuffer","ForceFeedBack"], pattern = "FB"
Output: [true,false,true,true,false]
Explanation: 
"FooBar" can be generated like this "F" + "oo" + "B" + "ar".
"FootBall" can be generated like this "F" + "oot" + "B" + "all".
"FrameBuffer" can be generated like this "F" + "rame" + "B" + "uffer".

Example 2:

Input: queries = ["FooBar","FooBarTest","FootBall","FrameBuffer","ForceFeedBack"], pattern = "FoBa"
Output: [true,false,true,false,false]
Explanation: 
"FooBar" can be generated like this "Fo" + "o" + "Ba" + "r".
"FootBall" can be generated like this "Fo" + "ot" + "Ba" + "ll".

Example 3:

Input: queries = ["FooBar","FooBarTest","FootBall","FrameBuffer","ForceFeedBack"], pattern = "FoBaT"
Output: [false,true,false,false,false]
Explanation: 
"FooBarTest" can be generated like this "Fo" + "o" + "Ba" + "r" + "T" + "est".

 

Note:

1. 1 <= queries.length <= 100
2. 1 <= queries[i].length <= 100
3. 1 <= pattern.length <= 100
4. All strings consists only of lower and upper case English letters.

Related Topics:
String, Trie

Solution 1.

// OJ: https://leetcode.com/problems/camelcase-matching/

// Time: O(QP)
// Space: O(1)
class Solution {
    bool match(string &s, string &p) {
        int i = 0, N = p.size();
        for (char c : s) {
            if (i == N) {
                if (isupper(c)) return false;
            } else if (isupper(p[i])) {
                if (islower(c)) continue;
                if (c != p[i++]) return false;
            } else if (c != p[i]) continue;
            else ++i;
        }
        return i == N;
    }
public:
    vector<bool> camelMatch(vector<string>& queries, string pattern) {
        vector<bool> ans;
        for (auto &s : queries) ans.push_back(match(s, pattern));
        return ans;
    }
};

Java

class Solution {
    public List<Boolean> camelMatch(String[] queries, String pattern) {
        List<Boolean> camelMatchList = new ArrayList<Boolean>();
        int length = queries.length;
        for (int i = 0; i < length; i++) {
            String query = queries[i];
            camelMatchList.add(isSubsequenceAndCamelcase(pattern, query));
        }
        return camelMatchList;
    }

    public boolean isSubsequenceAndCamelcase(String pattern, String query) {
        int length1 = pattern.length(), length2 = query.length();
        int index1 = 0, index2 = 0;
        while (index1 < length1 && index2 < length2) {
            char c1 = pattern.charAt(index1), c2 = query.charAt(index2);
            index2++;
            if (c1 == c2)
                index1++;
            else {
                if (c2 <= 'Z')
                    return false;
            }
        }
        while (index2 < length2) {
            char c2 = query.charAt(index2);
            index2++;
            if (c2 <= 'Z')
                return false;
        }
        return index1 == length1;
    }
}

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