//读入挂
inline ll read() {
ll c = getchar(), Nig = 1, x = 0;
while (!isdigit(c) && c != '-')c = getchar();
if (c == '-')Nig = -1, c = getchar();
while (isdigit(c))x = ((x << 1) + (x << 3)) + (c ^ '0'), c = getchar();
return Nig * x;
}
//输出挂
void out(int n)
{
if (n > 9)
out(n / 10);
putchar(n % 10 + '0');
}
#define read read()
Read in and out
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Origin blog.csdn.net/qq_45739057/article/details/106457329
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