HDU 1176 免费馅饼

http://acm.hdu.edu.cn/showproblem.php?pid=1176

数塔问题的变形.....(算不上变形吧..

View Code 
 1 #include <stdio.h>
 2 #include <string.h>
 3 #define maxn 100005
 4 int ans[maxn][13], dp[maxn][13];
 5 int max(int a, int b, int c)
 6 {
 7     return (a > b ? a : b) > c ? (a > b ? a : b) : c;
 8 }
 9 int main()
10 {
11     int i, j, n, x, t, m, now;
12     while(~scanf("%d",&n),n)
13     {
14         memset(ans,0,sizeof(ans));
15         memset(dp,0,sizeof(dp));
16         m = 0;
17         for(i = 0; i < n; i++)
18         {
19             scanf("%d%d",&x,&t);
20             ans[t][x+1] ++;
21             if(t > m) m =t;
22         }
23         now  = 0;
24         for(i = m+1; i >= 1; i--)
25         {
26             for(j = 1; j <= 11; j++)
27             {
28                 dp[i][j] = max(dp[i+1][j],dp[i+1][j-1],dp[i+1][j+1])+ans[i][j];
29                 if(now < dp[i][j] && 6-i <= j && j <= 6+i)  now = dp[i][j];
30             }
31         }
32         printf("%d\n",now);
33     }
34     return 0;
35 }
posted @ 2012-09-01 16:21  YORU  阅读(144)  评论(0)    收藏  举报