Roman To Integer leetcode java

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Roman To Integer leetcode java

问题描述: Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 算法: /** * 输入一个罗马数字,返回它的整型表示 * @author admin * 转换规则:从右向左或者从左向右遍历均可 * 1 相同数字连写,相加 ;2 小数字在大数字右边,相加;3 小数字在大数字左边,大的减去小的 */ 方法一:hashmap 从右向左遍历…

「Leetcode」13. Roman to Integer（Java）

分析把具体的情况一个一个实现即可,没有什么幺蛾子. 代码 class Solution { public int romanToInt(String s) { int ans = 0; for (int i=0; i!=s.length(); ++i) { switch(s.charAt(i)) { case 'I': if(i<s.length()-1 && (s.charAt(i+1)=='X' || s.charAt(i+1)=='V')) { ans--; break; }…

Roman to Integer -- LeetCode 13

Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. roman numerals: https://en.wikipedia.org/wiki/Roman_numerals Solution 1: class Solution { public: inline int romanInt(const char c) { switch(c…

Roman to Integer [LeetCode]

Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. Summary: When meeting C/X/I, remembers to search forward to check if there is a bigger number at the front. int romanToInt(string s) { ) ; ; ;…

13. Roman to Integer （JAVA)

Roman numerals are represented by seven different symbols: I, V, X, L, C, D 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 i…

Reverse Integer LeetCode Java

Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 public class Solution { public int reverse(int x) { if(x==Integer.MIN_VALUE) return 0; long result = 0; int i = 0; int temp = (x>0)?1:0; x = Math.abs(x); while…

LeetCode 13. 罗马数字转整数(Roman to Integer)

13. 罗马数字转整数 13. Roman to Integer 题目描述罗马数字包含以下七种字符: I,V,X,L,C,D 和 M. 字符数值 I 1 V 5 X 10 L 50 C 100 D 500 M 1000 例如,罗马数字 2 写做 II,即为两个并列的 1.12 写做 XII,即为 X + II.27 写做 XX…

[LeetCode][Python]Roman to Integer

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com'https://oj.leetcode.com/problems/roman-to-integer/Roman to Integer Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999.===Comments by D…

Leetcode#13. Roman to Integer（罗马数字转整数）

题目描述罗马数字包含以下七种字符:I, V, X, L,C,D 和 M. 字符数值 I 1 V 5 X 10 L 50 C 100 D 500 M 1000 例如, 罗马数字 2 写做 II ,即为两个并列的 1.12 写做 XII ,即为 X + II . 27 写做 XXVII, 即为 XX + V + II . 通常情况下,罗马数字中小的数字在大的数字的右边.但也存在特例,例如 4 不写做 IIII,而是 IV.数字 1 在数字 5 的左边,所表示的数等于大数 5 减小数 1 得到的数…

LeetCode: Roman to Integer 解题报告

Roman to IntegerGiven a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. SOLUTION 1: 思路: 从后往前遍历罗马数字,如果某个数比前一个数小,则把该数在结果中减掉:反之,则在结果中加上当前这个数: package Algorithms.string; public class RomanToInt { public…