0421 & SX2016

山西省选...这个省...不算强吧...然而就是这么腊鸡题目还是wa得一无是处...怎么办啊怎么办啊...无处拯救青春和未来啊...

T1:

　　POI2004原题 BZOJ1524

　　n<=16.这不是一眼 撞鸭吗...然而我怎么打炸了呢...看了一眼标算跟我枚举的方式有点不一样不过感觉更靠谱的样子...然而第一眼看一句话居然看不懂...

　　连枚举子集都忘了QAQ

　　for x = S; x ;x = S&(x-1);

T2:

　　打表找规律= =...

　　没取模!!!!!!日!!!!!!!!!

/*=================================
# Created time: 2016-04-21 10:09
# Filename: sequence.cpp
# Description:
=================================*/
#define me AcrossTheSky&HalfSummer11
#include <cstdio>
#include <cmath>
#include <ctime>
#include <string>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <algorithm>  

#include <set>
#include <stack>
#include <queue>
#include <vector>  

#define lowbit(x) (x)&(-x)
#define Abs(x) ((x) > 0 ? (x) : (-(x)))
#define FOR(i,a,b) for((i)=(a);(i)<=(b);(i)++)
#define FORP(i,a,b) for(int i=(a);i<=(b);i++)
#define FORM(i,a,b) for(int i=(a);i>=(b);i--)
#define ls(a,b) (((a)+(b)) << 1)
#define rs(a,b) (((a)+(b)) >> 1)
#define getlc(a) ch[(a)][0]
#define getrc(a) ch[(a)][1]  

#define maxn 300005
#define maxm 2000005
#define INF 1070000000
#define mod 1000000007
using namespace std;
typedef long long ll;
typedef unsigned long long ull;  

template<class T> inline
void read(T& num){
    num = 0; bool f = true;char ch = getchar();
    while(ch < ‘0‘ || ch > ‘9‘) { if(ch == ‘-‘) f = false;ch = getchar();}
    while(ch >= ‘0‘ && ch <= ‘9‘) {num = num * 10 + ch - ‘0‘;ch = getchar();}
    num = f ? num: -num;
}
int outs[100];
template<class T> inline
void write(T x){
	if (x==0) {putchar(‘0‘); puts(""); return;}
	if (x<0) {putchar(‘-‘); x=-x;}
	int num=0;
	while (x){ outs[num++]=(x%10); x=x/10;}
	FORM(i,num-1,0) putchar(outs[i]+‘0‘); puts("");
}
/*==================split line==================*/
ll n;
struct Matrix{
	ll s[2][2];
	void clear(){memset(s,0,sizeof(s));}
}f,a;
Matrix operator *(Matrix a,Matrix b){
    Matrix c;  c.clear();
    for (int i=0;i<2;i++)
        for (int j=0;j<2;j++)
          for (int k=0;k<2;k++)
              c.s[i][j]+=((a.s[k][j]%mod)*(b.s[i][k]%mod))%mod,c.s[i][j]%=mod;
    return c;
}
int main(){
	freopen("sequence.in","r",stdin);
	freopen("sequence.out","w",stdout);
	f.s[0][0]=1,f.s[0][1]=0,f.s[1][0]=0,f.s[1][1]=0;
	a.s[0][0]=2,a.s[0][1]=1,a.s[1][0]=1,a.s[1][1]=0;
   	read(n);
   	if (n==0){
       	write(0);
     	return 0;
    }
    n--;
    for(;n;n>>=1,a=a*a) if(n&1) f=f*a;
	write(f.s[0][0]);
}

T3:

　　显然新加串是原串一个前缀,搞一棵Trie,hash一下....然而为什么我BZ上过了考试的时候没过呢...

/*=================================
# Created time: 2016-04-21 10:09
# Filename: sequence.cpp
# Description:
=================================*/
#define me AcrossTheSky&HalfSummer11
#include <cstdio>
#include <cmath>
#include <ctime>
#include <string>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <algorithm>  

#include <set>
#include <stack>
#include <queue>
#include <vector>  

#define lowbit(x) (x)&(-x)
#define Abs(x) ((x) > 0 ? (x) : (-(x)))
#define FOR(i,a,b) for((i)=(a);(i)<=(b);(i)++)
#define FORP(i,a,b) for(int i=(a);i<=(b);i++)
#define FORM(i,a,b) for(int i=(a);i>=(b);i--)
#define pb push_back
#define ls(a,b) (((a)+(b)) << 1)
#define rs(a,b) (((a)+(b)) >> 1)
#define getlc(a) ch[(a)][0]
#define getrc(a) ch[(a)][1]  

#define maxn 2000005
#define maxm 100005
#define INF 1070000000
using namespace std;
typedef long long ll;
typedef unsigned long long ull;  

template<class T> inline
void read(T& num){
    num = 0; bool f = true;char ch = getchar();
    while(ch < ‘0‘ || ch > ‘9‘) { if(ch == ‘-‘) f = false;ch = getchar();}
    while(ch >= ‘0‘ && ch <= ‘9‘) {num = num * 10 + ch - ‘0‘;ch = getchar();}
    num = f ? num: -num;
}
int outs[100];
template<class T> inline
void write(T x){
	if (x==0) {putchar(‘0‘); puts(""); return;}
	if (x<0) {putchar(‘-‘); x=-x;}
	int num=0;
	while (x){ outs[num++]=(x%10); x=x/10;}
	FORM(i,num-1,0) putchar(outs[i]+‘0‘); puts("");
}
/*==================split line==================*/
const ll base=17;
int n,cnt=1,now; ll tmp;
int len[maxn],sum[maxn],ord[maxn],ch[maxn][26];
ull hash[maxn],p[maxn];
vector<char> s[maxn];
void insert(int x){
	if (!ch[now][x]) ch[now][x]=++cnt;
	now=ch[now][x];
	tmp=tmp*base+x+1;
}
int main(){
	freopen("string.in","r",stdin);
	freopen("string.out","w",stdout);
	p[0]=1; FORP (i,1,2000003) p[i]=p[i-1]*base;//,write(p[i]);
	read(n);
	FORP(i,1,n){
		char c;
		read(len[i]);
		FORP(j,0,len[i]-1)
				s[i].pb(getchar());
		now=1,tmp=0;
		FORP(j,0,len[i]-1) insert(s[i][j]-‘a‘);
		sum[now]++;ord[now]=i;hash[i]=tmp;
	}
	ll ans=0;
	FORP(i,1,n){
		now=1;
		FORP(j,0,len[i]-1){
			int x=s[i][j]-‘a‘;
			now=ch[now][x];
			if (sum[now] &&
			hash[ord[now]]*p[len[i]]+hash[i]==
			hash[i]*p[len[ord[now]]]+hash[ord[now]]) ans+=sum[now];
		}
	}
	ans=ans*2-n;
	write(ans);
	return 0;
}

T4:

　　打了个暴力这次暴力居然没出错...正解还没去看挖个坑>_<...Orz分块过的大神犇