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花了一个上午搞定,效率不错!!!(一维DP,二维循环)#include <stdio.h>
#include <string.h>
#define Min(a,b) ((a)<(b))?(a):(b)
int main()
{
int dp[31],n,m,i,j,x;
while(scanf("%d%d",&n,&m)!=EOF)
{
memset(dp,0,sizeof(dp));
for(i=1;i<=n;i++)
{
scanf("%d",&x);
x--;
for(j=Min(m,i);j>=0;j--)
{
if(x==j%2)
dp[j]++;
else if(j-1>=0 && dp[j-1]+1>dp[j])
dp[j]=dp[j-1]+1;
}
}
printf("%d\n",dp[m]);
}
return 0;
}
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