PAT 1050 String Subtraction

#include <cstdio>

#include <cstdlib>



using namespace std;



int main() {

    bool tbl[256] = {0};

    char line[10009];

    int len = 0;

    char ch;

    while (true) {

        scanf("%c", &ch);

        if (ch == '\n') break;

        line[len++] = ch;

    }

    line[len] = '\0';



    while (true) {

        scanf("%c", &ch);

        if (ch == '\n') break;

        tbl[ch] = true;

    }

    

    int wpos = 0, rpos = 0;

    while (rpos < len) {

        ch = line[rpos++];

        if (tbl[ch]) {

            continue;

        }

        line[wpos++] = ch;

    }

    line[wpos] = '\0';

    printf("%s", line);

    return 0;

}

水一发了