Given two strings S1 and S2, S=S1−S2 is defined to be the remaining string after taking all the characters in S2 from S1. Your task is simply to calculate S1−S2 for any given strings. However, it might not be that simple to do it fast.
Each input file contains one test case. Each case consists of two lines which gives S1 and S2, respectively. The string lengths of both strings are no more than 104. It is guaranteed that all the characters are visible ASCII codes and white space, and a new line character signals the end of a string.
Output Specification:
For each test case, print S1−S2 in one line.
They are students.
aeiou
Sample Output:
Thy r stdnts.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main {
/**
* Scanner 有2组数据超时，BufferedReader只有一组数据超时
* */
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
char[] inputString = br.readLine().toCharArray();
char[] limitString = br.readLine().toCharArray();
int[] limits = new int[300];
for (int i=0; i<limitString.length; ++i) {
char ch = limitString[i];
limits[ch]++;
}
for (int i=0; i<inputString.length; ++i) {
char ch = inputString[i];
if (limits[ch]==0) {
System.out.print(ch);
}
}
System.out.println();
}
}
