C++ 字符串减法：去除字符串中指定字符

#include #include

using namespace std;

int main() { string A, B; getline(cin, A); getline(cin, B);

string result = "";

for (int i = 0; i < A.length(); i++) {
    if (B.find(A[i]) == string::npos) {
        result += A[i];
    }
}

cout << result << endl;

return 0;

}