leetcode_打卡1

leetcode_打卡1

题目：1768. 交替合并字符串

解答：

思路： 模拟即可，字符串的提取：

a.charAt(i)

class Solution {
    public String mergeAlternately(String word1, String word2) {
        String result="";
        int m=word1.length();
        int n=word2.length();
        int i=0,j=0;
        while(i<m && j<n){
            result=result+word1.charAt(i);
            i++;
            result=result+word2.charAt(j);
            j++;
        }
        while(i<m) {
            result=result+word1.charAt(i);
            i++;
        }
        while(j<n) {
            result=result+word2.charAt(j);
            j++;
        }
        return result;

    }
}

优化：

class Solution {
    public String mergeAlternately(String s1, String s2) {
        int n = s1.length(), m = s2.length(), i = 0, j = 0;
        StringBuilder sb = new StringBuilder();
        while (i < n || j < m) {
            if (i < n) sb.append(s1.charAt(i++));
            if (j < m) sb.append(s2.charAt(j++));
        }
        return sb.toString();
    }
}

作者：AC_OIer
链接：https://leetcode.cn/problems/merge-strings-alternately/solution/by-ac_oier-rjve/
来源：力扣（LeetCode）