蜜汁头文件

Posted 2021-02-15 xiaoyezi-wink

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安利一波优秀的头文件  感谢大巨佬LH  有些迷

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#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<cstdlib>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> pr;
const double pi=acos(-1);

#define rep(i,a,n) for(int i=a;i<=n;i++)
#define per(i,n,a) for(int i=n;i>=a;i--)
#define Rep(i,u) for(int i=head[u];i;i=Next[i])
#define clr(a) memset(a,0,sizeof a)
#define pb push_back
#define mp make_pair
#define fi first
#define sc second

ld eps=1e-9;
ll pp=1000000007;
ll mo(ll a,ll pp)                //取模运算
{
    if(a>=0 && a<pp)return a;
    a%=pp;
    if(a<0)a+=pp;
    return a;
}

ll powmod(ll a,ll b,ll pp)     //a^b%p=
{
    ll ans=1;
    for(;b;b>>=1,a=mo(a*a,pp))
    if(b&1)ans=mo(ans*a,pp);
    return ans;
}


ll read()             //快读
{
    ll ans=0;
    char last=‘ ‘,ch=getchar();
    while(ch<‘0‘ || ch>‘9‘)last=ch,ch=getchar();
    while(ch>=‘0‘ && ch<=‘9‘)ans=ans*10+ch-‘0‘,ch=getchar();
    if(last==‘-‘)ans=-ans;
    return ans;
}