CodeForces - 1607A Linear Keyboard文本处理

Posted 2022-05-17 海岛Blog

A. Linear Keyboard
time limit per test 1 second
memory limit per test 256 megabytes

You are given a keyboard that consists of 26 keys. The keys are arranged sequentially in one row in a certain order. Each key corresponds to a unique lowercase Latin letter.

You have to type the word s on this keyboard. It also consists only of lowercase Latin letters.

To type a word, you need to type all its letters consecutively one by one. To type each letter you must position your hand exactly over the corresponding key and press it.

Moving the hand between the keys takes time which is equal to the absolute value of the difference between positions of these keys (the keys are numbered from left to right). No time is spent on pressing the keys and on placing your hand over the first letter of the word.

For example, consider a keyboard where the letters from ‘a’ to ‘z’ are arranged in consecutive alphabetical order. The letters ‘h’, ‘e’, ‘l’ and ‘o’ then are on the positions 8, 5, 12 and 15, respectively. Therefore, it will take |5−8|+|12−5|+|12−12|+|15−12|=13 units of time to type the word “hello”.

Determine how long it will take to print the word s.

Input
The first line contains an integer t (1≤t≤1000) — the number of test cases.

The next 2t lines contain descriptions of the test cases.

The first line of a description contains a keyboard — a string of length 26, which consists only of lowercase Latin letters. Each of the letters from ‘a’ to ‘z’ appears exactly once on the keyboard.

The second line of the description contains the word s. The word has a length from 1 to 50 letters inclusive and consists of lowercase Latin letters.

Output
Print t lines, each line containing the answer to the corresponding test case. The answer to the test case is the minimal time it takes to type the word s on the given keyboard.

Example
input
5
abcdefghijklmnopqrstuvwxyz
hello
abcdefghijklmnopqrstuvwxyz
i
abcdefghijklmnopqrstuvwxyz
codeforces
qwertyuiopasdfghjklzxcvbnm
qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq
qwertyuiopasdfghjklzxcvbnm
abacaba
output
13
0
68
0
74

问题链接：CodeForces - 1607A Linear Keyboard
问题简述：（略）
问题分析：（略）

AC的C语言程序如下：

/* CodeForces - 1607A Linear Keyboard */

#include <stdio.h>
#include <stdlib.h>

#define N 50
#define LA 26
char s[N + 1];
int pos[LA];

int main()

    int t;
    scanf("%d", &t);
    while (t--) 
        scanf("%s", s);
        for (int i = 0; s[i]; i++)
            pos[s[i] - 'a'] = i;

        scanf("%s", s);
        int ans = 0;
        for (int i = 1; s[i]; i++)
            ans += abs(pos[s[i] - 'a'] - pos[s[i - 1] - 'a']);

        printf("%d\\n", ans);
    

    return 0;