C++回溯法解决背包问题源码演示

工作之余，把代码过程常用的内容做个备份，下面代码段是关于C++回溯法解决背包问题演示的代码，应该对各位有较大好处。

include

include

using namespace std;

class Knapsack{
public:
p = pp;
w = ww;
n = nn;
c = cc;
cw = 0;
cp = 0;
bestp = 0;
x = new int[n];
cx = new int[n];
}

void knapsack(){
   backtrack(0);
 }

	if(i > n){
	    if(cp > bestp){
	       bestp = cp;
	       for(int i = 0; i < n; i++)
		 x[i] = cx[i];
	    }
	    return;
	}

	  cw += w[i];
	  cp += p[i];
	  cx[i] = 1;
	  backtrack(i+1);
	  cw -= w[i];
	  cp -= p[i];
	}
	cx[i] = 0;
}

void printResult(){
   cout << "可以装入的最大价值为:" << bestp << endl;
   cout << "装入的物品依次为:";
   for(int i = 0; i < n; i++){
     if(x[i] == 1)
		 cout << i+1 << " ";
   }
   cout << endl;
}

private:
int n;
double c;
};

int main(){
　　double p[4] = {9,10,7,4},w[4] = {3,5,2,1};
Knapsack ks = Knapsack(p,w,4,7);
ks.knapsack();
　　ks.printResult();
　　return 0;
}