【HDOJ】1160 FatMouse's Speed

DP。

 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>

 #define MAXNUM 1005

 typedef struct {
     int w, s;
     int index;
 } mouse_st;

 mouse_st mouses[MAXNUM];
 int dp[MAXNUM], next[MAXNUM];

 int comp(const void *a, const void *b) {
     mouse_st *p = (mouse_st *)a;
     mouse_st *q = (mouse_st *)b;
     if (p->w == q->w)
         return p->s - q->s;
     else
         return q->w - p->w;
 }

 int main() {
     int n=, m, beg;
     int i, j, max, index;

     while (scanf("%d %d", &mouses[n].w, &mouses[n].s) != EOF) {
         mouses[n].index = n;
         ++n;
     }

     memset(dp, , sizeof(dp));
     qsort(mouses, n, sizeof(mouse_st), comp);
     for (i=; i<n; ++i)
         next[i] = i;
     m = ;

     for (i=; i<n; ++i) {
         max = ;
         for (j=; j<i; ++j) {
             if (mouses[j].w>mouses[i].w && mouses[j].s<mouses[i].s) {
                 if (max < dp[j]) {
                     max = dp[j];
                     index = mouses[j].index;
                 }
             }
         }
         if (max)
             next[mouses[i].index] = index;
         dp[i] = max + ;
         if (m < dp[i]) {
             m = dp[i];
             beg = mouses[i].index;
         }
     }
     if (m == )
         printf("1\n1\n");
     else {
         printf("%d\n", m);
         while (next[beg] != beg) {
             printf("%d\n", beg+);
             beg = next[beg];
         }
         printf("%d\n", beg+);
     }

     return ;
 }