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3146. Permutation Difference between Two Strings

Description

You are given two strings s and t such that every character occurs at most once in s and t is a permutation of s.

The permutation difference between s and t is defined as the sum of the absolute difference between the index of the occurrence of each character in s and the index of the occurrence of the same character in t.

Return the permutation difference between s and t.

 

Example 1:

Input: s = "abc", t = "bac"

Output: 2

Explanation:

For s = "abc" and t = "bac", the permutation difference of s and t is equal to the sum of:

  • The absolute difference between the index of the occurrence of "a" in s and the index of the occurrence of "a" in t.
  • The absolute difference between the index of the occurrence of "b" in s and the index of the occurrence of "b" in t.
  • The absolute difference between the index of the occurrence of "c" in s and the index of the occurrence of "c" in t.

That is, the permutation difference between s and t is equal to \|0 - 1\| + \|2 - 2\| + \|1 - 0\| = 2.

Example 2:

Input: s = "abcde", t = "edbac"

Output: 12

Explanation: The permutation difference between s and t is equal to \|0 - 3\| + \|1 - 2\| + \|2 - 4\| + \|3 - 1\| + \|4 - 0\| = 12.

 

Constraints:

  • 1 <= s.length <= 26
  • Each character occurs at most once in s.
  • t is a permutation of s.
  • s consists only of lowercase English letters.

Solutions

Solution 1

  • class Solution {
        public int findPermutationDifference(String s, String t) {
            int[] d = new int[26];
            int n = s.length();
            for (int i = 0; i < n; ++i) {
                d[s.charAt(i) - 'a'] = i;
            }
            int ans = 0;
            for (int i = 0; i < n; ++i) {
                ans += Math.abs(d[t.charAt(i) - 'a'] - i);
            }
            return ans;
        }
    }
    
  • class Solution {
    public:
        int findPermutationDifference(string s, string t) {
            int d[26]{};
            int n = s.size();
            for (int i = 0; i < n; ++i) {
                d[s[i] - 'a'] = i;
            }
            int ans = 0;
            for (int i = 0; i < n; ++i) {
                ans += abs(d[t[i] - 'a'] - i);
            }
            return ans;
        }
    };
    
  • class Solution:
        def findPermutationDifference(self, s: str, t: str) -> int:
            d = {c: i for i, c in enumerate(s)}
            return sum(abs(d[c] - i) for i, c in enumerate(t))
    
    
  • func findPermutationDifference(s string, t string) (ans int) {
    	d := [26]int{}
    	for i, c := range s {
    		d[c-'a'] = i
    	}
    	for i, c := range t {
    		ans += max(d[c-'a']-i, i-d[c-'a'])
    	}
    	return
    }
    
  • function findPermutationDifference(s: string, t: string): number {
        const d: number[] = Array(26).fill(0);
        const n = s.length;
        for (let i = 0; i < n; ++i) {
            d[s.charCodeAt(i) - 'a'.charCodeAt(0)] = i;
        }
        let ans = 0;
        for (let i = 0; i < n; ++i) {
            ans += Math.abs(d[t.charCodeAt(i) - 'a'.charCodeAt(0)] - i);
        }
        return ans;
    }
    
    
  • public class Solution {
        public int FindPermutationDifference(string s, string t) {
            int[] d = new int[26];
            int n = s.Length;
            for (int i = 0; i < n; ++i) {
                d[s[i] - 'a'] = i;
            }
            int ans = 0;
            for (int i = 0; i < n; ++i) {
                ans += Math.Abs(d[t[i] - 'a'] - i);
            }
            return ans;
        }
    }
    
    

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