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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; } Followed by:
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