Sunday, April 21, 2024

# Codecraft-17 and Codeforces Round #391 (Div. 1 + Div. 2, combined), problem: (D) Felicity’s Big Secret Revealed Solution in C/C++

```#include<stdio.h>
#define m 1000000007u
typedef unsigned u;
u D[76][1u<<20],S[1u<<20];
char C[76];
u V[76][76];
int main()
{
u n,i,j,k,N=1u<<20,b,r=0;
scanf("%u",&n);
scanf("%s",C);
for(i=-1;++i<n;)for(j=i-1,k=0;++j<n;)
{
k=k<<1|(C[j]=='1');
V[i][j]=k;
}
for(i=-1;++i<=n;)D[i][0]=1;
for(i=-1;++i<n;)
{
for(j=i-1;++j<n;)
{
if(!V[i][j])continue;
if(V[i][j]>20)break;
b=1u<<(V[i][j]-1);
for(k=-1;++k<N;)
if((D[j+1][k|b]+=D[i][k])>=m)D[j+1][k|b]-=m;
}
}
for(i=-1;++i<=n;)
{
for(j=1;j<N;j=j<<1|1)
if((r+=D[i][j])>=m)r-=m;
}
printf("%u\n",r);
return 0;
}```

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