PAT 1050 String Subtraction

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#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;}

水一發了

PAT 1050 String Subtraction