97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
//http://acm.hdu.edu.cn/showproblem.php?pid=5542
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#include<cstdio>
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struct char_reader
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{
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FILE* f; char *buf,*p1,*p2; int size;
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char_reader(FILE* fin,int bufsize=1000000) { f=fin; size=bufsize; p1=p2=0; buf=new char[bufsize]; }
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inline int operator()() { return p1==p2&&(p2=(p1=buf)+fread(buf,1,size,f),p1==p2)?EOF:*p1++; }
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};
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struct char_writer
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{
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FILE* f; char *buf,*p,*end;
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char_writer(FILE* fout,int bufsize=1000000) { f=fout; buf=new char[bufsize]; p=buf; end=buf+bufsize; }
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~char_writer() { fwrite(buf,p-buf,1,f); }
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inline char operator()(char ch) { return end==p&&(fwrite(buf,end-buf,1,f),p=buf),*p++=ch; }
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};
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char_reader gch(stdin);
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char_writer wch(stdout);
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template<typename T> inline void read(T& t)
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{
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t=0; bool f=false; char ch;
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while(ch=gch(),!((ch>='0'&&ch<='9')||ch=='-'));
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if(ch=='-') f=true,ch=gch();
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t=ch-'0';
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while(ch=gch(),ch>='0'&&ch<='9') t=t*10+ch-'0';
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if(f) t=-t;
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}
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template<typename T> inline void write(T t)
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{
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int stk[20],cnt=0;
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if(t==0) { wch('0'); return; }
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if(t<0) { wch('-'); t=-t; }
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while(t>0) { stk[cnt++]=t%10; t/=10; }
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while(cnt) wch(stk[--cnt]+'0');
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}
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inline void write(char t) { wch(t); }
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inline void write(const char *&s) { while(*s) wch(*s++); }
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#if __cplusplus >= 201103L
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template<typename T,typename... Args> inline void read(T& t,Args&... args) { read(t); read(args...); }
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template<typename T,typename... Args> inline void write(T t,Args... args) { write(t); write(args...); }
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#else
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template<typename A_t,typename B_t> inline void read(A_t &a,B_t &b) { read(a); read(b); }
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template<typename A_t,typename B_t,typename C_t> inline void read(A_t &a,B_t &b,C_t &c) { read(a); read(b); read(c); }
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template<typename A_t,typename B_t,typename C_t,typename D_t> inline void read(A_t &a,B_t &b,C_t &c,D_t &d) { read(a); read(b); read(c); read(d); }
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template<typename A_t,typename B_t> inline void write(A_t a,B_t b) { write(a); write(b); }
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template<typename A_t,typename B_t,typename C_t> inline void write(A_t a,B_t b,C_t c) { write(a); write(b); write(c); }
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template<typename A_t,typename B_t,typename C_t,typename D_t> inline void write(A_t a,B_t b,C_t c,D_t d) { write(a); write(b); write(c); write(d); }
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template<typename A_t,typename B_t,typename C_t,typename D_t,typename E_t> inline void write(A_t a,B_t b,C_t c,D_t d,E_t e) { write(a); write(b); write(c); write(d); write(e); }
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#endif
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#include<cstring>
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#include<algorithm>
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#include<cassert>
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using namespace std;
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const int mod=1e9+7;
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const int oo=0x3f3f3f3f;
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int T,n,m,a[1005],f[1005][1005],c[1005],b[1005],kase;
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inline void add(int p,int v)
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{
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assert(p);
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for(;p<=n;p+=(p&-p)) (c[p]+=v)%=mod;
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}
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inline int ask(int p)
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{
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assert(p);
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int res=0;
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for(;p;p-=(p&-p)) (res+=c[p])%=mod;
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return res;
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}
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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read(T);
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while(T-->0)
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{
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read(n,m);
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for(int i=1;i<=n;i++) { read(a[i]); b[i]=a[i]; }
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sort(b+1,b+1+n);
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for(int i=1;i<=n;i++) a[i]=lower_bound(b+1,b+1+n,a[i])-b+1;
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memset(f,0,sizeof(f));
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f[0][0]=1;
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for(int i=1;i<=m;i++)
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{
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memset(c,0,sizeof(c));
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add(1,f[i-1][0]);
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for(int j=1;j<=n;j++)
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{
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f[i][j]=ask(a[j]-1);
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add(a[j],f[i-1][j]);
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}
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}
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int res=0;
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for(int i=1;i<=n;i++) res=(res+f[m][i])%mod;
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write("Case #",++kase,": ",res,'\n');
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}
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return 0;
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} |