mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
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#include <iostream>
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#include <sstream>
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#include <cstdio>
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#include <cstdlib>
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#include <algorithm>
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#include <cmath>
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#include <iomanip>
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#include <cstring>
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#include <string>
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#include <map>
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#include <set>
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#include <vector>
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using namespace std;
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const int MOD=1000000007;
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const int MaxN=103;
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const int MaxM=203;
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int N,K,f[2][MaxN][MaxM],s[MaxN][MaxM];
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int solve()
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{
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int MaxK=2*K+1;
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for (int i=0; i<=K; ++i)
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for (int j=0; j<=MaxK; ++j) f[0][i][j]=s[i][j]=0;
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f[0][0][0]=1;
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s[0][0]=1;
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int cur=0,last;
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for (int i=1; i<=N; ++i)
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{
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last=cur;
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cur=1-cur;
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for (int j=0; j<=K; ++j)
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for (int k=0; k<=MaxK; ++k) f[cur][j][k]=0;
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f[cur][0][0]=1;
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for (int j=1; j<=K; ++j)
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{
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for (int k=j; k<MaxK-1; ++k)
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{
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f[cur][j][k]=f[cur][j-1][k-1]+f[last][j][k-j];
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f[cur][j][k]%=MOD;
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}
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for (int p=0; p<=j; ++p)
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{
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int cnt=MaxK-1-j;
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f[cur][j][MaxK-1]+=s[p][cnt];
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f[cur][j][MaxK-1]%=MOD;
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cnt=MaxK-j;
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f[cur][j][MaxK]+=s[p][cnt];
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f[cur][j][MaxK]%=MOD;
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}
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}
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for (int j=0; j<=K; ++j)
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for (int k=MaxK; k>=0; --k) s[j][k]=f[cur][j][k];
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for (int j=0; j<=K; ++j)
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for (int k=MaxK-2; k>=0; --k)
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{
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s[j][k]+=s[j][k+2];
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s[j][k]%=MOD;
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}
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}
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int ans=0;
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for (int i=0; i<=K; ++i)
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for (int j=i+i; j<MaxK; j+=2)
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{
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ans+=f[cur][i][j];
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ans%=MOD;
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}
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return ans;
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}
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int main()
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{
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int Testnum;
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scanf("%d",&Testnum);
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for (int Test=1; Test<=Testnum; ++Test)
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{
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scanf("%d %d",&N,&K);
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printf("Case #%d: %d\n",Test,solve());
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}
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}
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