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请教：为什么while (!cin.eof())不行，而while (cin >> a >> b)就可以了（附源码）？
int main()
{
int a, b, temp, max;
//while (!cin.eof()) { //这样写提交是WA
while (cin >> a >> b) ｛ //这样写提交就AC了，Why？
cin >> a >> b;
cout << a << " " << b << " ";
if (a > b) {
temp = a;
a = b;
b = temp;
}
max = 0;
for (int i = a; i <= b; ++i) {
int cur = get_cycle(i);
if (cur > max)
max = cur;
}
cout << max << endl;
}
return 0;
}
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