洛谷 P3112 后卫马克Guard Mark

#include<algorithm>
#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
const int inf=1e9+7;
int n,H,h[25],w[25],s[25],f[(1<<20)+1],g[(1<<20)+1],ans=-1;
int main() {
    scanf("%d%d",&n,&H);
    for(int i=0; i<=n-1; i++)
        scanf("%d%d%d",&h[i],&w[i],&s[i]);
    memset(f,-1,sizeof(f));
    f[0]=inf;
    for(int i=0; i<=(1<<n)-1; i++)
        for(int j=0; j<=n-1; j++)
            if(f[i]>=w[j]) {
                if((i>>j)&1) continue;
                int k=i^(1<<j);
                f[k]=max(f[k],min(f[i]-w[j],s[j]));
                g[k]=g[i]+h[j];
                if(g[k]>=H) ans=max(ans,f[k]);
            }
    if(ans<0) printf("Mark is too tall");
    else printf("%d",ans);
    return 0;
}