HDU 2844 Coins Multiple backpack

Poke here: 2844

Review the knapsack problem

Test instructions: Tell you the value and quantity of the coins in N, how many different denominations can be composed, the denomination is limited in the interval [1, M]

Idea: Cover one side with a backpack, take the space of the coin for its own value, then when the dp[i] = = i, the space for I backpack back filled, that can constitute the case of denomination I

1#include"bits/stdc++.h"2 using namespacestd;3 intN, M;4 intval[ the], num[ the];5 intdp[100010];6 7 voidZopack (intSpaintval)8 {9     inti;Ten      for(i = M; I >= spa;--i) { OneDp[i] = max (Dp[i-spa] +Val, dp[i]); A     } - } -  the voidCopack (intSpaintval) - { -     inti; -      for(i = spa; I <= M; + +)i) { +Dp[i] = max (Dp[i-spa] +Val, dp[i]); -     } + } A  at voidMultipack (intSpaintValintnum) - { -     //can ignore the quantity when the full backpack -     if(M <= Spa *num) { - Copack (Spa, Val); -         return ; in     } -     //otherwise the binary divides the number of goods do, 01 backpack to     intK =1; +      while(K <num) { -num-=K; theZopack (Spa * k, Val *k); *  $K <<=1;Panax Notoginseng     } -Zopack (Spa * num, Val *num); the } +  A intMain () the { +      while(SCANF ("%d%d", &n, &m)! = EOF && (N | |M)) { -         //Initialize $         //memset (DP, 0, sizeof (dp[0)) * (M + 1)); //Hey, 110, why don't you give me that? RE (╯‵-′) ╯︵┻━┻ $Memset (DP,0,sizeof(DP)); -         inti; -         //input the          for(i =1; I <= N; ++i) { -scanf"%d", &val[i]);Wuyi         } the          for(i =1; I <= N; ++i) { -scanf"%d", &num[i]); Wu         } -         //do a full backpack, for each kind of item About          for(i =1; I <= N; ++i) { $ //multipack (Val[i], val[i], num[i]); - multipack (Val[i], val[i], num[i]); -         } -         //Traverse DP, Statistical solution number A         intres =0; +          for(i =1; I <= M; ++i) { the             if(Dp[i] = =i) { -++Res; $             } the         } the         //Output theprintf"%d\n", res); the     } -}

HDU 2844 Coins Multiple backpack