12. Integer to Roman (HashTable)
Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
思路:罗马数字共有七个,即I(1),V(5),X(10),L(50),C(100),D(500),M(1000)。
第一步,按照千分位,百分位...一一算下来。
class Solution {
public:
string intToRoman(int num) {
int quote;
int residue;
string ret = ""; //first deal with 10^3
quote = num/;
residue = num%;
while(quote > ){
ret += 'M';
quote--;
} //then deal with 10^2
quote = residue/;
residue %= ;
if(quote==){
ret += "CM";
}
else if(quote >=){
ret += 'D';
while(quote > ){
ret += 'C';
quote--;
}
}
else if(quote==){
ret += "CD";
}
else{
while(quote > ){
ret += 'C';
quote--;
}
} //then deal with 10
quote = residue/;
residue %= ;
if(quote==){
ret += "XC";
}
else if(quote >=){
ret += 'L';
while(quote > ){
ret += 'X';
quote--;
}
}
else if(quote==){
ret += "XL";
}
else{
while(quote > ){
ret += 'X';
quote--;
}
} //finally deal with 1
quote = residue;
if(quote==){
ret += "IX";
}
else if(quote >=){
ret += 'V';
while(quote > ){
ret += 'I';
quote--;
}
}
else if(quote==){
ret += "IV";
}
else{
while(quote > ){
ret += 'I';
quote--;
}
} return ret;
}
};
第二步,代码有冗余,将其归纳整合。并且用减法代替除法!
class Solution {
public:
string intToRoman(int num) {
int values[] = {, , , , , , , , , , , , }; //数组的初始化
string numerals[] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I" };
int size = sizeof(values) / sizeof(values[]); //获取数组的大小
string result = ""; for (int i = ; i < size; i++) {
while (num >= values[i]) {
num -= values[i];
result+=numerals[i];
}
}
return result;
}
};
12. Integer to Roman (HashTable)的更多相关文章
- Leetcode 12——Integer to Roman
12.Integer to Roman Given an integer, convert it to a roman numeral. Input is guaranteed to be withi ...
- Leetcode 12. Integer to Roman(打表,水)
12. Integer to Roman Medium Roman numerals are represented by seven different symbols: I, V, X, L, C ...
- leetCode练题——12. Integer to Roman
1.题目 12. Integer to Roman Roman numerals are represented by seven different symbols: I, V, X, L, C, ...
- 《LeetBook》leetcode题解(12):Integer to Roman[M]
我现在在做一个叫<leetbook>的免费开源书项目,力求提供最易懂的中文思路,目前把解题思路都同步更新到gitbook上了,需要的同学可以去看看 书的地址:https://hk029.g ...
- 【LeetCode】12. Integer to Roman (2 solutions)
Integer to Roman Given an integer, convert it to a roman numeral. Input is guaranteed to be within t ...
- [LeetCode] 12. Integer to Roman ☆☆
Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 t ...
- [LeetCode] 12. Integer to Roman 整数转化成罗马数字
Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 ...
- 12. Integer to Roman
Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 t ...
- 【LeetCode】12. Integer to Roman 整型数转罗马数
题目: Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from ...
随机推荐
- Web 端屏幕适配方案
基础知识 像素相关 1.像素 :像素是屏幕显示最小的单位. 2.设备像素 :设备像素又称物理像素(physical pixel),设备能控制显示的最小单位,我们可以把这些像素看作成显示器上一个个的点. ...
- test20181020 B君的第二题
题意 分析 考场70分 一看就是裸的kmp,直接打上去. #include<cstdlib> #include<cstdio> #include<cmath> #i ...
- JavaWeb入门环境搭建
一.安装配置Tomcat 1.下载 2.配置环境变量 配置JAVA_HOME环境变量,路径为JDK的根目录 3.测试Tomcat 打开浏览器,在地址栏输入http://localhost:8080可以 ...
- phpmyadmin不允许一个表创建多个主键的解决办法
在phpmyadmin中执行建表语句 CREATE TABLE `user3` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(2 ...
- linux之 multipath 多路径
一.什么是多路径 普通的电脑主机都是一个硬盘挂接到一个总线上,这里是一对一的关系.而到了有光纤组成的SAN环境,或者由iSCSI组成的IPSAN环境,由于主机和存储通过了光纤交换机或者多块网卡及IP来 ...
- macdown在mac OS 中的配置
macdown 用命令行打开.md文件 执行两条命令即可. sudo echo "open -a MacDown \$*" > /usr/local/bin/macdown ...
- 在linux,arm上的屏幕搜索wifi并连接(qt,多选择,wifi按信号排列)转
先上代码!! #include "widget.h"#include "ui_widget.h"#include <QVBoxLayout>#inc ...
- iPhone应用提交流程:如何将App程序发布到App Store
http://www.techolics.com/apple/20120401_197.html 对于刚加入iOS应用开发行列的开发者来说,终于经过艰苦的Coding后完成了第一个应用后最重要的历史时 ...
- Oracle.DataAccess.dll 部署安装
Oracle.DataAccess.dll 要拷贝到项目发布目录 项目发布的时候,还必须要拷贝以下几个文件在运行目录1.oci.dll 2.oraociicus11.dll 3.OraOps11w.d ...
- 面试总结之C/C++
source code https://github.com/haotang923/interview/blob/master/interview%20summary%20of%20C%20and%2 ...