686_RepeatedStringMatch - a920604a/leetcode GitHub Wiki

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title: 686. Repeated String Match categories: leetcode comments: false

problem

solution

先重複a多次，直到達到b長度，在遍歷aa尋找是否有字串相符

class Solution {
public:
    int repeatedStringMatch(string a, string b) {
        
        
        int m = b.size(), repeat = 1;
        string aa = a;
        while(aa.size() <m){
            aa+=a;
            repeat++;
        }
        int n = aa.size();
        if (aa.find(b) != string::npos) return repeat;
        aa += a;
        return (aa.find(b) != string::npos) ? repeat + 1 : -1;
  
    }
};

analysis

• time complexity O(n)
• space complexity O(n)