delete pics to save space
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28
1.1896.cpp
Normal file
28
1.1896.cpp
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@ -0,0 +1,28 @@
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#include<cstdio>
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#include<cstring>
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#include<algorithm>
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#include<vector>
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using namespace std;
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typedef unsigned long long ULL;
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int n,m,pcnt[1<<9];
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ULL f[10][1<<9][82],res=0;
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vector<int> nxt[1<<9];
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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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scanf("%d%d",&n,&m);
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f[0][0][0]=1;
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for(int st=0;st<(1<<n);st++)
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for(int i=0;i<(1<<n);i++) if((st&i)==0&&(st&(i<<1))==0&&(st&(i>>1))==0&&(i&(i<<1))==0) nxt[st].push_back(i);
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for(int i=1;i<(1<<n);i++) pcnt[i]=pcnt[i>>1]+(i&1);
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for(int i=0;i<n;i++) for(int st=0;st<(1<<n);st++) for(int j=0;j<=m&&j<=n*i;j++) if(f[i][st][j])
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{
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ULL v=f[i][st][j];
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for(int k=0;k<nxt[st].size();k++) if(j+pcnt[nxt[st][k]]<=m) f[i+1][nxt[st][k]][j+pcnt[nxt[st][k]]]+=v;
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}
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for(int st=0;st<(1<<n);st++) res+=f[n][st][m];
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printf("%llu\n",res);
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return 0;
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}
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