Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.Symbol ValueI 1V 5X 10L 50C 100D 500M 1000For example, 2 is written as II in Roman numeral, just two ones added together. 12 is written as XII, which is simply X + II. The number 27 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 a roman numeral, convert it to an integer. Example 1:Input: s = "III"Output: 3Explanation: III = 3.Example 2:Input: s = "LVIII"Output: 58Explanation: L = 50, V= 5, III = 3.Example 3:Input: s = "MCMXCIV"Output: 1994Explanation: M = 1000, CM = 900, XC = 90 and IV = 4. Constraints:1 <= s.length <= 15s contains only the characters ('I', 'V', 'X', 'L', 'C', 'D', 'M').It is guaranteed that s is a valid roman numeral in the range [1, 3999].
Question
Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.Symbol ValueI 1V 5X 10L 50C 100D 500M 1000For example, 2 is written as II in Roman numeral, just two ones added together. 12 is written as XII, which is simply X + II. The number 27 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 a roman numeral, convert it to an integer. Example 1:Input: s = "III"Output: 3Explanation: III = 3.Example 2:Input: s = "LVIII"Output: 58Explanation: L = 50, V= 5, III = 3.Example 3:Input: s = "MCMXCIV"Output: 1994Explanation: M = 1000, CM = 900, XC = 90 and IV = 4. Constraints:1 <= s.length <= 15s contains only the characters ('I', 'V', 'X', 'L', 'C', 'D', 'M').It is guaranteed that s is a valid roman numeral in the range [1, 3999].
Solution
Sure, I can help with that. Here's a Python solution for the problem:
def romanToInt(s):
roman_dict = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
total = 0
prev_value = 0
for i in range(len(s)-1, -1, -1):
current_value = roman_dict[s[i]]
if current_value < prev_value:
total -= current_value
else:
total += current_value
prev_value = current_value
return total
This function works by iterating over the input string from right to left. It uses a dictionary to map Roman numerals to their integer values. For each character, it checks if its value is less than the value of the previous character. If it is, it subtracts the value from the total; otherwise, it adds the value to the total.
Similar Questions
Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.Symbol ValueI 1V 5X 10L 50C 100D 500M 1000For example, 3 is written as III in Roman numeral, just three ones added together. 12 is written as XII, which is simply X + II. The number 26 is written as XXVI, which is XX + V + I.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.Input FormatN, integerConstraints1 <= N <= 2000Output Formatset of charactersSample Input 03Sample Output 0IIISample Input 158Sample Output 1LVIIISample Input 21994Sample Output 2MCMXCIV
In Roman Numerals, MMCVII – MDCCXI = ?
If we interchange the place of the symbols in the Roman Numeral "VI", by how much value will the numeral decrease?
How can a roman numeral in a chemical name be used to write a chemical formula?A.The roman numeral is the charge on the nonmetal in the chemical formula.B.The roman numeral is the nonmetal's oxidation state used as the subscript on the metal in the crisscross method.C.The roman numeral is the subscript on the metal in the chemical formula.D.The roman numeral is the metal's oxidation state used as the subscript on the nonmetal in the crisscross method.
How should each appendix be represented?a.Roman Numerals ( I,II,III)b.Arabic Numerals (1,2,3)c.Capital letters (A,B,C)d.Lowercase letters (a,b,c)
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