常用模板

代码框架

#include <bits/stdc++.h>
using namespace std;

int main()
{
	
	return 0;
}

#include <bits/stdc++.h>
using namespace std;

using ll=long long;
const int inf=0x3f3f3f3f;
const int mod=1e9+7;
const int N=100005;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	return 0;
}

文件读写

freopen("problem.in","r",stdin);
freopen("problem.out","w",stdout);

cout 格式

cout<<fixed<<setprecision(6)<<x<<'\n';
cout<<setw(6)<<x<<'\n';

刷新缓冲区

cout<<flush;
fflush(stdout);
cout.flush();

mt19937

random_device rd;
mt19937 gen(rd());
uniform_int_distribution<int> dist(1,100);
int k=dist(gen);