1050. String Subtraction

Given-Strings S_{1 and S2, s = S1-s 2 is defined to being theremaining string after taking all the Charac Ters in S2 from S1. Your task is simply to calculate S1-s2 for any given strings. However, it might is not is, simple-to-do it fast.}

Input Specification:

Each input file contains the one test case. Each case consists of lines which gives S_{1and S 2, respectively. The string lengths of both strings is no more than^{4. It is guaranteed and a new line character signals the end of the characters is visible ASCII codes and white space of a string.}}

Output Specification:

For each test case, the print S_1-s2 in one line.

Strlen () is a loop in itself, so don't use it in the loop, it's timed out

#include <stdio.h> #include <stdlib.h> #include <string.h> #define N 10001int Main () {    char str1[n] , Str2[n];    BOOL flag[92];    memset (flag,0,sizeof (flag));    Gets (STR1);    Gets (STR2);    int i,length;    Length=strlen (STR2);    for (i=0;i<length;i++)    {         flag[str2[i]-']=true;         }    Length=strlen (STR1);    for (i=0;i<length;i++)    {         if (flag[str1[i]-']!=true) printf ("%c", Str1[i]);         }    printf ("\ n");    System ("pause");    return 0;    }

1050. String Subtraction