冷知识(CSP必备)

#pragma GCC optimmize(3,"Ofast","inline")//O3优化

#pragma GCC optimmize(2)//O2优化

#pragma GCC optimmize(1)//O1优化

快读

template<typename type>
inline void read(type &x)
{
    x=0;bool flag(0);char ch=getchar();
    while(!isdigit(ch)) flag=ch=='-',ch=getchar();
    while(isdigit(ch)) x=(x<<1)+(x<<3)+(ch^48),ch=getchar();
    flag?x=-x:0;
}

关闭输入输出流同步

std::ios::sync_with_stdio(false);

不开long long的人必看，不然十年OI一场空

#define int long long

经常用的

#define 1e9+7 Mod
#define 1e5+10 n

        ### **·**
        ### **·**
        ### **·**

将编译器改为c++14

1.点工具-编译器选项 2.把第1个勾上 3.写-std=gnu++14//代码

对拍c++版

#include <bits/stdc++.h>
#include <windows.h>
using namespace std;
#define N 1000010
#define ll long long

template <class T>
inline void read(T& a){
	T x = 0, s = 1;
	char c = getchar();
	while(!isdigit(c)){ if(c == '-') s = -1; c = getchar(); }
	while(isdigit(c)){ x = x * 10 + (c ^ '0'); c = getchar(); }
	a = x * s;
	return ;
}

int a[N], cnt1 = 0;
int b[N], cnt2 = 0; 
char buf[1024]; 

void wrong_and_pause(){
	printf("Wrong!\n");
	system("pause"); 
	return ; 
}

bool check(int x){
	cnt1 = 0, cnt2 = 0;
	memset(a, 0, sizeof(a));
	memset(b, 0, sizeof(b)); 
	freopen("1.out", "r", stdin);
	while(scanf("%d", &a[++cnt1]) != EOF) ;
	fclose;
	freopen("2.out", "r", stdin);
	while(scanf("%d", &b[++cnt2]) != EOF) ;
	fclose; 
	printf("%d %d\n", a[1], b[1]); 
	if(cnt1 != cnt2){
		wrong_and_pause();  
		return 0; 
	}
	for(int i = 1; i <= cnt1; i++){
		if(b[i] != a[i]){
			wrong_and_pause(); 
			return 0; 
		}
	}
	return 1; 
}

int main(){
	for(int i = 1; i <= 1000; i++){
		sprintf(buf, "get.exe > 1.in");
		system(buf);
		sprintf(buf, "T2.exe < 1.in > 1.out");
		system(buf); 
		sprintf(buf, "std.exe < 1.in > 2.out");
		system(buf); 
		if(check(1)){
			printf("Right Answer!\n"); 
		}
		Sleep(700); 
	}
	return 0;
}

注：保证你已经有了造数据、暴力、算法的代码

拯救电脑代码(当你的朋友给你用c++代码植入病毒)

#include <stdio.h>
#include <shlobj.h>
#include <windows.h>

BOOL SelfDel()
{
	SHELLEXECUTEINFO sei;
	TCHAR szModule[MAX_PATH], szComspec[MAX_PATH], szParams[MAX_PATH];

	if ((GetModuleFileName(0, szModule, MAX_PATH) != 0) &&
		(GetShortPathName(szModule, szModule, MAX_PATH) != 0) &&
		(GetEnvironmentVariable("COMSPEC", szComspec, MAX_PATH) != 0))
	{
		lstrcpy(szParams, "/c del ");
		lstrcat(szParams, szModule);
		lstrcat(szParams, " > nul");
		// 设置结构成员.
		sei.cbSize = sizeof(sei);
		sei.hwnd = 0;
		sei.lpVerb = "Open";
		sei.lpFile = szComspec;
		sei.lpParameters = szParams;
		sei.lpDirectory = 0; sei.nShow = SW_HIDE;
		sei.fMask = SEE_MASK_NOCLOSEPROCESS;
		// 创建cmd进程.
		if (ShellExecuteEx(&sei))
		{
			// 设置cmd进程的执行级别为空闲执行,使本程序有足够的时间从内存中退出.
			SetPriorityClass(sei.hProcess, IDLE_PRIORITY_CLASS);
			// 将自身进程的优先级置高
			SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
			SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
			// 通知Windows资源浏览器,本程序文件已经被删除.
			SHChangeNotify(SHCNE_DELETE, SHCNF_PATH, szModule, 0);
			return TRUE;
		}
	}
	return FALSE;
}

int main(int argc, char* argv[])
{
	SelfDel();
	return 0;
}