link:http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=565
用一个二维数组g[i][v]表示：当状态转移到v的时候，第i个物品是不是用到，如果用到标记１，否则标记０．
输出路径的时候，注意，从物品编号０一直到n-1.如果某个物品被用到了，g[i][v]里面的v，就要减去这个物品的体积，然后继续往下找．
1 /* 2 * ===================================================================================== 3 * Filename: cd.cpp 4 * Created: 04/08/2013 15:21:34 5 * Author: liuxueyang (lxy), 1459917536@qq.com 6 * Organization: Hunan University 7 * 8 * ===================================================================================== 9 */ 10 11 /* 12 ID: zypz4571 13 LANG: C++ 14 TASK: cd.cpp 15 */ 16 #include <iostream> 17 #include <cstdlib> 18 #include <cstdio> 19 #include <cstring> 20 #include <cmath> 21 #include <cctype> 22 #include <algorithm> 23 #include <queue> 24 #include <set> 25 #include <stack> 26 #include <map> 27 #include <list> 28 #define INF 0x3f3f3f3f 29 #define MOD 1000000007 30 #define LL long long 31 const double eps=1e-9; 32 using namespace std; 33 int V, n, c[22], f[22222], g[22][22222]; 34 int main ( int argc, char *argv[] ) 35 { 36 #ifndef ONLINE_JUDGE 37 freopen("in.txt", "r", stdin); 38 #endif 39 ios::sync_with_stdio(false); 40 while (cin>>V) { 41 cin>>n; 42 for (int i = 0; i < n; ++i) cin>>c[i]; 43 memset(f,0,sizeof(f)); 44 memset(g,0,sizeof(g)); 45 for (int i = n-1; i>=0; --i) { 46 for (int v = V; v>=c[i]; --v) { 47 if (f[v] <= f[v-c[i]]+c[i]) { 48 f[v] = f[v-c[i]]+c[i]; g[i][v] = 1; 49 } else g[i][v] = 0; 50 } 51 } 52 for (int i = 0, j = V; i < n; ++i) { 53 if (g[i][j]) { 54 cout<<c[i]<<' '; 55 j-=c[i]; 56 } 57 } 58 cout<<"sum:"<<f[V]<<endl; 59 } 60 return EXIT_SUCCESS; 61 } /* ---------- end of function main ---------- */
再一次表示vim比codeblocks好用多了，囧