poj3211

01背包

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
using namespace std;

#define maxn 105
#define maxm 15
#define maxl 50
#define maxt maxn * 1000

struct Cloth
{
    int t, c;
}cloth[maxn];

int m, n;
char color[maxm][maxl];
bool f[maxt];

bool operator < (const Cloth &a, const Cloth &b)
{
    return a.c < b.c;
}

int getid(char *a)
{
    for (int i = 0; i < m; i++)
        if (!strcmp(a, color[i]))
            return i;
    return -1;
}

void input()
{
    for (int i = 0; i < m; i++)
        scanf("%s", color[i]);
    for (int i = 0; i < n; i++)
    {
        char temp[maxl];
        scanf("%d%s", &cloth[i].t, temp);
        cloth[i].c = getid(temp);
    }
}

int bag(int w[], int num, int sum)
{
    memset(f, 0, sizeof(bool) * (sum + 1));
    f[0] = true;
    for (int i = 0; i < num; i++)
        for (int j = sum; j - w[i] >= 0; j--)
            f[j] = f[j] || f[j - w[i]];
    int ret = sum;
    while (!f[ret])
        ret--;
    return ret;
}

void work()
{
    int l = 0;
    int wash[maxn];
    int ans = 0;
    for (int i = 0; i < m; i++)
    {
        int x = 0;
        int sum = 0;
        while (cloth[l].c == i)
        {
            wash[x++] = cloth[l].t;
            sum += cloth[l].t;
            l++;
        }
        ans += sum - bag(wash, x, sum / 2);
    }
    printf("%d\n", ans);
}

int main()
{
    //freopen("t.txt", "r", stdin);
    while (scanf("%d%d", &m, &n), m | n)
    {
        memset(cloth, -1, sizeof(cloth));
        input();
        sort(cloth, cloth + n);
        work();
    }
    return 0;
}