UVa301 - Transportation

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#include <iostream>
#include <cstring>
using namespace std;
struct Station
{
	int start;
	int end;
	int num_of_people;
};
const int maxsize = 25;
Station Orders[maxsize];
int people_num_of_station[10];
int max_people,num_of_station,num_of_orders;
int ans;
bool check()
{
	for(int i=0;i<=num_of_station;++i)
		if(people_num_of_station[i]>max_people)
			return false;
	return true;
}
void dfs(int val,int sum)
{
	if(sum>ans)
		ans=sum;
	for(int i=val;i<num_of_orders;++i)
	{
		for(int j=Orders[i].start;j<Orders[i].end;++j)
			people_num_of_station[j]+=Orders[i].num_of_people;
		if(check())
			dfs(i+1,sum+Orders[i].num_of_people*(Orders[i].end-Orders[i].start));
		for(int j=Orders[i].start;j<Orders[i].end;++j)
			people_num_of_station[j]-=Orders[i].num_of_people;
	}
}
int main()
{
	while(cin>>max_people>>num_of_station>>num_of_orders)
	{
		if(max_people==0&&num_of_station==0&&num_of_orders==0)
			break;
		for(int i=0;i<num_of_orders;++i)
			cin>>Orders[i].start>>Orders[i].end>>Orders[i].num_of_people;
		ans=-1;
		memset(people_num_of_station,0,sizeof(people_num_of_station));
		dfs(0,0);
		cout<<ans<<endl;
	}
	return 0;
}

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