面试题 01.03. URL化

https://leetcode-cn.com/problems/string-to-url-lcci/

 

class Solution {
    public String replaceSpaces(String S, int length) {
        S = S.substring(0, length)replace(" ", "%20");
        return S;
    }
}

// 	12 ms	47 MB

class Solution {
    public String replaceSpaces(String S, int length) {
        char[] aa = S.toCharArray();
		String[] bb = new String[length];
		for (int i = 0; i < length; i++) {
			if (aa[i] == ' ') {
				bb[i] = "%20";
			} else {
				bb[i] = String.valueOf(aa[i]);
			}
		}
		
		StringBuffer c = new StringBuffer();
		for (String b : bb) {
			c.append(b);
		}
        return c.toString();
    }
}
// 	20 ms	46.8 MB

class Solution {
    public String replaceSpaces(String S, int length) {
        char[] aa = S.toCharArray();

        StringBuffer c = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (aa[i] == ' ') {
				c.append("%20");
			} else {
				c.append(aa[i]);
			}
		}
        return c.toString();
    }
}

// 		18 ms	47 MB