Poj-3624 charm bracelet

01 backpack, DP short answer on the line, to use a rolling array, or the memory to burst. The direction of the For Loop is very important. Although it is a simple question, it helps a lot to understand DP,

I tried to write every status according to the team leader, which is easier to understand.

1 # include <stdio. h> 2 # include <string. h> 3 # define doumax (A, B) (A> B? A: B) 4 const int maxn = 3500, maxm = 13000; 5 Int W [maxn], d [maxn], DP [maxm]; 6 int main () 7 {8 int n, m; 9 While (scanf ("% d", & N, & M) = 2) {10 for (INT I = 1; I <= N; I ++) 11 scanf ("% d", & W [I], & D [I]); 12 memset (DP, 0, sizeof (DP); 13 for (INT I = 1; I <= N; I ++) 14 for (Int J = m; j> 0; j --) {15 if (j> = W [I]) 16 DP [J] = doumax (DP [J], DP [J-W [I] + d [I]); 17} 18 printf ("% d \ n", DP [m]); 19} 20 return 0; 21}