欢乐纪中A组周六赛【2019.4.13】

版权声明：原创，未经作者允许禁止转载 https://blog.csdn.net/Mr_wuyongcong/article/details/89283163

前言

做A组被虐好惨

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成绩

$Rank$是有算别人的

$Rank$	$Person$	$Score$	$A$	$B$	$C$
$2$	$巨佬WHF$	$140$	$40$	$100$	$0$
$2$	$巨佬ZZY$	$140$	$40$	$100$	$0$
$5$	$巨佬HJW$	$100$	$100$	$0$	$0$
$14$	$蒟蒻WYC$	$60$	$40$	$20$	$0$
$20$	$初二ZYC$	$40$	$40$	$0$	$0$
$20$	$初二XJQ$	$40$	$40$	$0$	$0$
$25$	$巨佬TRX$	$20$	$0$	$20$	$0$
$25$	$初二LW$	$20$	$0$	$20$	$0$
$33$	$初二XXY$	$10$	$0$	$10$	$0$
$34$	$初二HZB$	$0$	$0$	$0$	$0$
$34$	$巨佬QYH$	$0$	$0$	$0$	$0$
$34$	$初二LRZ$	$0$	$0$	$0$	$0$

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正题

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$T1:jzoj3169-[GDOI2013$模拟 $4]$生产汽车【斜率优化 $dp,$单调队列 $,$二分】

链接:
https://blog.csdn.net/Mr_wuyongcong/article/details/89281824

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$T2:jzoj3170-[GDOI2013$模拟 $4]$挑选玩具【容斥 $,$状态压缩 $,$分治】

链接:
https://blog.csdn.net/Mr_wuyongcong/article/details/89282043

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$T3:jzoj3171-[GDOI2013$模拟 $4]$重心【真 $·$物理 $,$二分】

链接:
https://blog.csdn.net/Mr_wuyongcong/article/details/89282845

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$some\ of\ code$

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$T1\ 40points\ code$

#include<cstdio>
#include<algorithm>
#include<cstdio>
#define ll long long
using namespace std;
const ll N=110000;
ll n,m,t[N],f[N],over[N];
int main()
{
	scanf("%lld%lld",&n,&m);
	for(ll i=1;i<=n;i++)
	  scanf("%lld",&t[i]);
	for(ll j=1;j<=m;j++)
	  scanf("%lld",&f[j]);
	for(ll i=1;i<=m;i++){
		ll s=0,begin=0;
		for(ll j=1;j<=n;j++){
			s+=t[j-1]*f[i];
		  	begin=max(begin,over[j]-s);
		}
		for(ll j=1;j<=n;j++){
			begin+=t[j]*f[i];
			over[j]=begin;
		}
	}
	printf("%lld",over[n]);
} 

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$T2\ 20points\ code$

#include<cstdio>
#include<algorithm>
#include<cstring>
#define ll long long
using namespace std;
const ll N=110,M=2048,XJQ=1000000007;
ll n,m,a[N],f[2][M],MS;
int main()
{
	scanf("%lld%lld",&n,&m);
	for(ll i=1;i<=n;i++)
	{
		ll k;scanf("%lld",&k);
		while(k--){
			ll x;
			scanf("%lld",&x);
			a[i]|=(1<<x-1);
		}
	}
	MS=1<<m;f[0][0]=1;
	for(ll i=1;i<=n;i++)
	{
		memset(f[i&1],0,sizeof(f[i&1])); 
		for (ll j=0;j<MS;j++)
		{
			ll k=j|a[i];
			(f[i&1][k]+=f[~i&1][j])%=XJQ;
			(f[i&1][j]+=f[~i&1][j])%=XJQ;
		}
	}
	printf("%lld",f[n&1][MS-1]);
}

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总结

看题预估分 $40+50+0=90???$
做题预估分 $40+50+0=90$
实际分数 $40+20+0=60$
$T1$开始不会，后来也不会，然后写暴力
$T2$开始不会，后来依旧不会，然后写暴力结果只有 $20???$
$T3$日常看不懂

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尾声

$\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%HJW$
$\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%ZZY$
$\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%WHF$
$\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%LZH233$