uva 624 CD 01背包打印路径

Posted 2020-07-04 phlsheji

// 集训最终開始了。来到水题先

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <iostream>
using namespace std;
int a[23];
int d[23][100000];
int flag[23];
int W,n;

void init(){
    cin >> n;
    for (int i=1;i<=n;i++)
        cin >> a[i];
    memset(flag,0,sizeof(flag));
    memset(d,0,sizeof(d));
}

void print(int x,int y){
    if (y<=0||x<1)  return ;
    //cout << x << " " << y << endl;
    if (d[x][y]==d[x-1][y]){
        flag[x] = 0;
        print(x-1,y);
        //return ;
    }else if (d[x][y]==d[x-1][y-a[x]] + a[x]){
        flag[x] = 1;
        //cout << a[x] << " ";
        print(x-1,y-a[x]);
        //return ;
    }
}

void solve(){
    for (int i=1;i<=n;i++){
        for (int j=W;j>=0;j--){
            d[i][j] = d[i-1][j];
            if (j>=a[i])
                d[i][j] = max(d[i-1][j],d[i-1][j-a[i]] + a[i]);
        }
    }

    print(n,W);

    for (int i=1;i<=n;i++)
        if (flag[i])
            printf("%d ",a[i]);
    printf("sum:%d\n",d[n][W]);
}

int main(){
    //freopen("1.txt","r",stdin);
    while(cin >> W){
        init();
        solve();
    }
}