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吕梓瑜
初级天翼
初级天翼
long long read(){
char c; while(c=getchar(),(c<'0' || c>'9') && c!='-');long long x=0,y=1;
if(c=='-')y=-1;else x=c-'0';
while (c=getchar(),c>='0' && c<='9') x=x*10+c-'0'; return x*y;
}
int main()
{
//freopen(".in","r",stdin);
//freopen(".out","w",stdout);
cout<<read()*2;
//fclose(stdin);
//fclose(stdout);
return 0;
}
@李奕歌
0
徐子宸
中级天翼
中级天翼
char gc() {
static char now[1 << 20], *S, *T;
if (T == S) {
T = (S = now) + std::fread(now, 1, 1 << 20, stdin);
if (T == S) return EOF;
}
return *S++;
}
template <typename T>
void Read(T &x) {
x = 0;
char c = gc();
while (c < '0' || c > '9') c = gc();
x = c - '0';
while ((c = gc()) >= '0' && c <= '9') x = x * 10 + c - '0';
}
template <typename T, typename... Args>
void Read(T &x, Args &... args) {
Read(x);
Read(args...);
}
明明这个最快
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