【leetcode】Excel Sheet Column Title & Excel Sheet Column Number
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两道相关联的题目,一个是将数字转换为26进制,一个是将26进制表示方法转换为10进制
第一次觉得java好慢。
public class Solution { public String convertToTitle(int n) { StringBuilder sb = new StringBuilder();while (n > 0) {int apd = n % 26;char c;if (apd == 0) {c = 'Z';n = n / 26 - 1;} else {c = (char) (apd + 'A' - 1);n = n / 26;}sb.append(c);}return sb.reverse().toString(); }}
public class Solution { public int titleToNumber(String s) { HashMap<Character, Integer> map = new HashMap<Character, Integer>();char c = 'A';for(int i=1;i<=26;++i){map.put(c,i);c += 1;}int result = 0; int i = s.length()-1; int t = 0; while(i >= 0){ char curr = s.charAt(i); result = result + (int) Math.pow(26, t) * map.get(curr); t++; i--; }return result; }}
Math.pow(底数,几次方)如:double a=2.0; double b=3.0;double c=Math.pow(a,b);就是2的三次方是多少;c最终为8;
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