黄金8行

以前的

大括号换行为适应工程
（凑行数）

#include<iostream>
using namespace std;
int main()
{
    cout<<"Hello World"<<endl;
    system("pause");
    return 0;
}

现在的

#define ONLINE_JUDGE
namespace Fread{ const int SIZE = 1 << 20; char buf[SIZE], *S, *T; inline char getchar() { if (S == T) { T = (S = buf) + fread(buf, 1, SIZE, stdin); if (S == T) return '\n'; } return *S++; }}using namespace Fread;namespace Fwrite{ const int SIZE = 1 << 20; char buf[SIZE], *S = buf, *T = buf + SIZE; inline void flush() { fwrite(buf, 1, S - buf, stdout); S = buf; } inline void putchar(char c) { *S++ = c; if (S == T) flush(); } struct NTR { ~NTR() { flush(); } } ztr;}using namespace Fwrite;
#define getchar Fread::getchar
#define putchar Fwrite::putchar
namespace Fastio { struct Reader { template <typename T> Reader& operator >> (T &x) { x = 0; short f = 1; char c = getchar(); while (c < '0' || c > '9') { if (c == '-') f *= -1; c = getchar(); } while (c >= '0' && c <= '9') x = (x << 3) + (x << 1) + (c ^ 48), c = getchar(); x *= f; return *this; } Reader& operator >> (double &x) { x = 0; double t = 0; short f = 1, s = 0; char c = getchar(); while ((c < '0' || c > '9') && c != '.') { if (c == '-') f *= -1; c = getchar(); } while (c >= '0' && c <= '9' && c != '.') x = x * 10 + (c ^ 48), c = getchar(); if (c == '.') c = getchar(); else { x *= f; return *this; } while (c >= '0' && c <= '9') t = t * 10 + (c ^ 48), s++, c = getchar(); while (s--) t /= 10.0; x = (x + t) * f; return *this; } Reader& operator >> (long double &x) { x = 0; long double t = 0; short f = 1, s = 0; char c = getchar(); while ((c < '0' || c > '9') && c != '.') { if (c == '-') f *= -1; c = getchar(); } while (c >= '0' && c <= '9' && c != '.') x = x * 10 + (c ^ 48), c = getchar(); if (c == '.') c = getchar(); else { x *= f; return *this; } while (c >= '0' && c <= '9') t = t * 10 + (c ^ 48), s++, c = getchar(); while (s--) t /= 10.0; x = (x + t) * f; return *this; } Reader& operator >> (__float128 &x) { x = 0; __float128 t = 0; short f = 1, s = 0; char c = getchar(); while ((c < '0' || c > '9') && c != '.') { if (c == '-') f *= -1; c = getchar(); } while (c >= '0' && c <= '9' && c != '.') x = x * 10 + (c ^ 48), c = getchar(); if (c == '.') c = getchar(); else { x *= f; return *this; } while (c >= '0' && c <= '9') t = t * 10 + (c ^ 48), s++, c = getchar(); while (s--) t /= 10.0; x = (x + t) * f; return *this; } Reader& operator >> (char &c) { c = getchar(); while (c == ' ' || c == '\n' || c == '\r') c = getchar(); return *this; } Reader& operator >> (char *str) { int len = 0; char c = getchar(); while (c == ' ' || c == '\n' || c == '\r') c = getchar(); while (c != ' ' && c != '\n' && c != '\r') str[len++] = c, c = getchar(); str[len] = '\0'; return *this; } Reader& operator >> (string &str) { str.clear(); char c = getchar(); while (c == ' ' || c == '\n' || c == '\r') c = getchar(); while (c != ' ' && c != '\n' && c != '\r') str.push_back(c), c = getchar(); return *this; } Reader() {} } cin; const char endl = '\n'; struct Writer { const int Setprecision = 6; typedef int mxdouble; template <typename T> Writer& operator << (T x) { if (x == 0) { putchar('0'); return *this; } if (x < 0) putchar('-'), x = -x; static short sta[40]; short top = 0; while (x > 0) sta[++top] = x % 10, x /= 10; while (top > 0) putchar(sta[top] + '0'), top--; return *this; } Writer& operator << (double x) { if (x < 0) putchar('-'), x = -x; mxdouble _ = x; x -= (double)_; static short sta[40]; short top = 0; while (_ > 0) sta[++top] = _ % 10, _ /= 10; if (top == 0) putchar('0'); while (top > 0) putchar(sta[top] + '0'), top--; putchar('.'); for (int i = 0; i < Setprecision; i++) x *= 10; _ = x; while (_ > 0) sta[++top] = _ % 10, _ /= 10; for (int i = 0; i < Setprecision - top; i++) putchar('0'); while (top > 0) putchar(sta[top] + '0'), top--; return *this; } Writer& operator << (long double x) { if (x < 0) putchar('-'), x = -x; mxdouble _ = x; x -= (long double)_; static short sta[40]; short top = 0; while (_ > 0) sta[++top] = _ % 10, _ /= 10; if (top == 0) putchar('0'); while (top > 0) putchar(sta[top] + '0'), top--; putchar('.'); for (int i = 0; i < Setprecision; i++) x *= 10; _ = x; while (_ > 0) sta[++top] = _ % 10, _ /= 10; for (int i = 0; i < Setprecision - top; i++) putchar('0'); while (top > 0) putchar(sta[top] + '0'), top--; return *this; } Writer& operator << (__float128 x) { if (x < 0) putchar('-'), x = -x; mxdouble _ = x; x -= (__float128)_; static short sta[40]; short top = 0; while (_ > 0) sta[++top] = _ % 10, _ /= 10; if (top == 0) putchar('0'); while (top > 0) putchar(sta[top] + '0'), top--; putchar('.'); for (int i = 0; i < Setprecision; i++) x *= 10; _ = x; while (_ > 0) sta[++top] = _ % 10, _ /= 10; for (int i = 0; i < Setprecision - top; i++) putchar('0'); while (top > 0) putchar(sta[top] + '0'), top--; return *this; } Writer& operator << (char c) { putchar(c); return *this; } Writer& operator << (char *str) { int cur = 0; while (str[cur]) putchar(str[cur++]); return *this; } Writer& operator << (const char *str) { int cur = 0; while (str[cur]) putchar(str[cur++]); return *this; } Writer& operator << (string str) { int st = 0, ed = str.size(); while (st < ed) putchar(str[st++]); return *this; } Writer() {} } cout; } using namespace Fastio;
#define cin Fastio::cin
#define cout Fastio::cout
#define endl Fastio::endl