zoukankan      html  css  js  c++  java
  • #Leetcode# 12. Integer to Roman

    https://leetcode.com/problems/integer-to-roman/

    Roman numerals are represented by seven different symbols: IVXLCD and M.

    Symbol       Value
    I             1
    V             5
    X             10
    L             50
    C             100
    D             500
    M             1000

    For example, two is written as II in Roman numeral, just two one's added together. Twelve is written as, XII, which is simply X + II. The number twenty seven is written as XXVII, which is XX + V + II.

    Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII. Instead, the number four is written as IV. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as IX. There are six instances where subtraction is used:

    • I can be placed before V (5) and X (10) to make 4 and 9. 
    • X can be placed before L (50) and C (100) to make 40 and 90. 
    • C can be placed before D (500) and M (1000) to make 400 and 900.

    Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999.

    Example 1:

    Input: 3
    Output: "III"

    Example 2:

    Input: 4
    Output: "IV"

    Example 3:

    Input: 9
    Output: "IX"

    Example 4:

    Input: 58
    Output: "LVIII"
    Explanation: L = 50, V = 5, III = 3.
    

    Example 5:

    Input: 1994
    Output: "MCMXCIV"
    Explanation: M = 1000, CM = 900, XC = 90 and IV = 4.

    代码:

    class Solution {
    public:
        string intToRoman(int num) {
            string res = "";
            vector<int> val{1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
            vector<string> str{"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
            for (int i = 0; i < val.size(); i ++) {
                while (num >= val[i]) {
                    num -= val[i];
                    res += str[i];
                }
            }
            return res;
        }
    };
    

      

  • 相关阅读:
    服务级后门自己做——创建服务
    使用Win32创建串口通讯程序
    LoadImage with resource 出现未定义
    direct path write等待事件
    enq: TX row lock/index contention、allocate ITL等待事件
    enq: TT contention等待事件
    enq: TM contention等待事件
    enq: RO fast object reuse等待事件
    direct path write temp等待事件
    enq: US contention等待事件
  • 原文地址:https://www.cnblogs.com/zlrrrr/p/10096359.html
Copyright © 2011-2022 走看看