Hello everyone.
I recently entered the contest Codeforces Round 699 (Div. 2), specifically I did the exercise 1481A - Space Navigation , which asked me to read two integers qx, qy and finally a string character S. I use C ++ programming language to do this. I used the fflush(stdin) function to clear the count memory while doing this, specifically my main code at the time was:
vector <string> ans;
int main() {
int t, a, b;
string s;
cin >> t;
for (int i = 0; i < t; i++) {
cin >> a >> b;
fflush(stdin);
getline(cin, s);
ans.push_back(solve(a, b, s));
}
for (int i = 0; i < ans.size(); i++)
cout << ans[i] << endl;
}
The problem I have is that the codeforces system does not seem to be executing my fflush () function, while I am still able to run the correct program using my computer.
I have to fix my program to:
vector <string> ans;
int main() {
int t, a, b;
string s;
cin >> t;
for (int i = 0; i < t; i++) {
cin >> a >> b;
cin >> s;
ans.push_back(solve(a, b, s));
}
for (int i = 0; i < ans.size(); i++)
cout << ans[i] << endl;
}
With this program, the system accepted my program.
However, entering a string using the function std :: cin is not a good choice, if there is ' '(whitespace, # 32 ASCII) in the string then I don't really know how to read the data. :(
I write this article to ask you to share your experiences about the problem that I am facing to help my upcoming competitions go smoother.
Thank you for reading my article, good day.
I'm not sure what fflush is supposed to do here, but you can use
cin.ignore
to ignore the stream until a'\n'
is encountered.See this article for a detailed answer.