This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.
#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false); //读入输出优化的强迫症
int c, q = 1;
//在windows平台，stdin输入流的EOF标志是 ctrl + z,然后回车就结束了！在黑窗口下试试，
// Clion中需要进入调试模式，然后ctrl+d 即可退出
//参考：https://www.zhihu.com/question/41952758
while ((c = getchar()) != EOF) {
if (c == '"') {
printf("%s", q ? "``" : "''");
q = !q;
} else printf("%c", c);
}
return 0;
