SDOI2017 R2 Day2
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2018.4.29 Test
时间：7:30~11:30(实际没用多少)
实际得分：0+20+30=50
总结
T1 BZOJ.4912.[SDOI2017]天才黑客
T2 BZOJ.4913.[SDOI2017]遗忘的集合
正解生成函数什么的
部分分有点坑
弃了T3 BZOJ.4914.[SDOI2017]文本校正
考试代码
T1
#include <cstdio>
#include <cctype>
#include <cstring>
#include <algorithm>
#define gc() getchar()
const int N=5e4+5,S=2e4+5;
int n,m,k,l1,l2,Enum,H[N],to[N],nxt[N],len[N],pos[N],Ans[N];
char s1[S],s2[S];
struct Trie
{
int c[S],dep[N],to[S],nxt[S],H[S],Enum,top[S],fa[S],son[S],sz[S],id,pos[S];
inline void Add(int u,int v,int w){
to[++Enum]=v, nxt[Enum]=H[u], H[u]=Enum, c[Enum]=w;
}
void Init(){
Enum=0, memset(H,0,sizeof H), id=0;
}
void DFS1(int x)
{
int mx=0; sz[x]=1, son[x]=0;
for(int v,i=H[x]; i; i=nxt[i])
if((v=to[i])!=fa[x])
{
fa[v]=x, dep[v]=dep[x]+1, DFS1(v), sz[x]+=sz[v];
if(mx<sz[v]) mx=sz[v], son[x]=v;
}
}
void DFS2(int x,int tp)
{
top[x]=tp, pos[x]=++id;
if(son[x]){
DFS2(son[x],tp);
for(int i=H[x]; i; i=nxt[i])
if(to[i]!=fa[x]&&to[i]!=son[x]) DFS2(to[i],to[i]);
}
}
int Query(int u,int v)
{
if(u==1||v==1) return 0;
while(top[u]!=top[v])
{
if(dep[top[u]]<dep[top[v]]) std::swap(u,v);
u=fa[top[u]];
}
return dep[u]<dep[v]?dep[u]:dep[v];
}
}t;
inline int read()
{
int now=0;register char c=gc();
for(;!isdigit(c);c=gc());
for(;isdigit(c);now=now*10+c-'0',c=gc());
return now;
}
inline void AddEdge(int u,int v,int w,int p){
to[++Enum]=v, len[Enum]=w, nxt[Enum]=H[u], pos[v]=p, H[u]=Enum;
}
int main()
{
freopen("hack.in","r",stdin);
// freopen("hack.out","w",stdout);
int T=read();
while(T--)
{
memset(Ans,0x7f,sizeof Ans);
memset(H,0,sizeof H);
Enum=0;
n=read(),m=read(),k=read();
for(int u,v,w,i=1; i<=m; ++i)
u=read(),v=read(),w=read(),AddEdge(u,v,w,read());
for(int u,v,i=1; i<k; ++i)
u=read(),v=read(),t.Add(v,u,read());
for(int x=1; x<=n; ++x)
for(int i=H[x]; i; i=nxt[i])
len[i]+=t.Query(pos[x],pos[to[i]]);
}
fclose(stdin);fclose(stdout);
return 0;
}T2
#include <cstdio>
#include <cctype>
#include <algorithm>
#define gc() getchar()
const int N=(1<<18)+5;//262149
int n,p,f[N],g[N],cnt,s[N];
long long ans;
inline int read()
{
int now=0;register char c=gc();
for(;!isdigit(c);c=gc());
for(;isdigit(c);now=now*10+c-'0',c=gc());
return now;
}
void DFS(int sta,int pur,int sum)
{
if(sum==pur) ++ans;
else{
for(int i=sta; i<=cnt; ++i)
if(sum+s[i]<=pur) DFS(i,pur,sum+s[i]);
else break;
}
}
void Spec()
{
srand(20180430);
for(int i=1; i<=n; ++i) s[i]=i;
bool flag=0;
for(int i=1; i<=25; ++i)
{
s[++cnt]=i, ans=0, DFS(1,i,0), ans%=p;
if(ans>f[i]) {flag=1; break;}
}
if(!flag) cnt+=rand()%(n-cnt)+1;
--cnt;
printf("%d\n",cnt);
for(int i=1; i<=cnt; ++i) printf("%d ",s[i]);
}
int main()
{
freopen("set.in","r",stdin);
freopen("set.out","w",stdout);
n=read(),p=read();
for(int i=1; i<=n; ++i) f[i]=read();
if(n>5000) {Spec(); return 0;}
if(f[1]) s[++cnt]=1;
if(f[2]>1||(f[2]&&!f[1])) s[++cnt]=2;
// g[0]=1, g[1]=f[1], g[2]=f[2];
for(int i=3; i<=n; ++i)
{
// for(int j=1; j<=cnt/*&&s[j]<=i*/; ++j)
// (g[i]+=g[i-s[j]])%=p;
// ++g[i], g[i]>>=1;
ans=0, DFS(1,i,0), ans%=p;//O(2^cnt)
// printf("%d:%lld\n",i,ans);
if(ans!=f[i]) s[++cnt]=i;
}
printf("%d\n",cnt);
for(int i=1; i<=cnt; ++i) printf("%d ",s[i]);
fclose(stdin);fclose(stdout);
return 0;
}T3
#include <cstdio>
#include <cctype>
#define gc() getchar()
typedef unsigned long long ull;
const int N=1e6+5;
const ull seed=200009;
int n,m,S[N],T[N];
ull pw[N],hs_S[N],hs_T[N];
inline int read()
{
int now=0;register char c=gc();
for(;!isdigit(c);c=gc());
for(;isdigit(c);now=now*10+c-'0',c=gc());
return now;
}
void Init(int n){
pw[0]=1;
for(int i=1; i<=n; ++i) pw[i]=pw[i-1]*seed;
}
inline ull Get_Hash(int l,int r,ull *hs){
return hs[r]-hs[l-1]*pw[r-l+1];
}
int main()
{
// freopen("fix.in","r",stdin);
// freopen("fix.out","w",stdout);
Init(1000000);
int Case=read(),pos1,pos2,l1,l2,l3;
ull hs1,hs2,hs3;
while(Case--)
{
n=read(),m=read();
// if(n>5000) break;
for(int i=1; i<=n; ++i) S[i]=read();
for(int i=1; i<=n; ++i) T[i]=read();
for(int i=1; i<=n; ++i)
hs_S[i]=hs_S[i-1]*seed+S[i],hs_T[i]=hs_T[i-1]*seed+T[i];
int f=0;
for(int i=1; i<n&&!f; ++i)
for(int j=i+1; j<n; ++j)
{
l1=i, l2=j-i, l3=n-j;
hs1=Get_Hash(1,i,hs_T), hs2=Get_Hash(i+1,j,hs_T), hs3=Get_Hash(j+1,n,hs_T);
// printf("%d %d %lld %lld %lld\n",i,j,hs1,hs2,hs3);
if((hs1==Get_Hash(1,i,hs_S)&&hs2==Get_Hash(i+1,j,hs_S)&&hs3==Get_Hash(j+1,n,hs_S))) f=1;
else if((hs1==Get_Hash(1,i,hs_S)&&hs3==Get_Hash(i+1,i+l3,hs_S)&&hs2==Get_Hash(i+l3+1,n,hs_S))) f=2;
else if((hs2==Get_Hash(1,l2,hs_S)&&hs1==Get_Hash(l2+1,l2+l1,hs_S)&&hs3==Get_Hash(l2+l1+1,n,hs_S))) f=3;
else if((hs2==Get_Hash(1,l2,hs_S)&&hs3==Get_Hash(l2+1,l2+l3,hs_S)&&hs1==Get_Hash(l2+l3+1,n,hs_S))) f=4;
else if((hs3==Get_Hash(1,l3,hs_S)&&hs1==Get_Hash(l3+1,l3+l1,hs_S)&&hs2==Get_Hash(l3+l1+1,n,hs_S))) f=5;
else if((hs3==Get_Hash(1,l3,hs_S)&&hs2==Get_Hash(l3+1,l3+l2,hs_S)&&hs1==Get_Hash(l3+l2+1,n,hs_S))) f=6;
if(f) {pos1=i, pos2=j; break;}
}//按拼接顺序。。
switch(f)
{
case 0: puts("NO"); break;
case 1: printf("YES\n%d %d\n%d %d\n%d %d\n",1,pos1,pos1+1,pos2,pos2+1,n); break;
case 2: printf("YES\n%d %d\n%d %d\n%d %d\n",1,pos1,pos2+1,n,pos1+1,pos2); break;
case 3: printf("YES\n%d %d\n%d %d\n%d %d\n",pos1+1,pos2,1,pos1,pos2+1,n); break;
case 4: printf("YES\n%d %d\n%d %d\n%d %d\n",pos1+1,pos2,pos2+1,n,1,pos1); break;
case 5: printf("YES\n%d %d\n%d %d\n%d %d\n",pos2+1,n,1,pos1,pos1+1,pos2); break;
case 6: printf("YES\n%d %d\n%d %d\n%d %d\n",pos2+1,n,pos1+1,pos2,1,pos1); break;
}
}
// fclose(stdin);fclose(stdout);
return 0;
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