Tuesday, June 18, 2024

# Codeforces Round #384 (Div. 2), problem: (E) Vladik and cards Solution in C/C++

```#include <stdio.h>
#include <string.h>
#define MIN(X,Y) ((X)<(Y) ? (X) : (Y))

int n,c[1010],r[1010][10][1010],dp[10][300][1010];
int solve(int aver,int c,int b,int k);

int main(void)
{
//freopen("cards.in","r",stdin);
//freopen("cards.out","w",stdout);
scanf("%d",&n);
int i,j,k;
for(i=1;i<=n;i++)
scanf("%d",&c[i]);
memset(r,-1,sizeof(r));
int s;
for(i=1;i<=n;i++)
for(j=1;j<=8;j++)
{
r[i][j][s=0]=i-1;
for(k=i;k<=n;k++)
if(c[k]==j) r[i][j][++s]=k;
}
int min=1,max=n,m,t;
while(min<max)
{
m=(min+max+1)/2;
memset(dp,-1,sizeof(dp));
if(solve(m/8,m%8,0,1)<=n) min=m;
else max=m-1;
}
printf("%d\n",min);
return 0;
}

int solve(int aver,int c,int b,int k)
{
if(dp[c][b][k]>=0) return dp[c][b][k];
int t=(1<<8)-1;
if( (t&b)==t && !c ) return dp[c][b][k]=k-1;
else if((t&b)==t) return dp[c][b][k]=n+1;
dp[c][b][k]=n+1;
int i;
for(i=0;i<8;i++)
if((b&(1<<i))==0)
{
if(r[k][i+1][aver]>=0)
dp[c][b][k]=MIN(dp[c][b][k],solve(aver,c,b|(1<<i),r[k][i+1][aver]+1));
if( c && r[k][i+1][aver+1]>=0 )
dp[c][b][k]=MIN(dp[c][b][k],solve(aver,c-1,b|(1<<i),r[k][i+1][aver+1]+1));
}
return dp[c][b][k];
}```

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