#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cstring>
#define lson rt<<1,l,mid
#define rson rt<<1|1,mid+1,r
using namespace std;
int c,s,r,a[60010<<2]={0},la[60010<<2]={0};
void _updata(int x)
{
	a[x<<1]+=la[x];
	a[x<<1|1]+=la[x];
	la[x<<1]+=la[x];
	la[x<<1|1]+=la[x];
	la[x]=0;
}
void insert(int x,int y,int z,int rt,int l,int r)
{
	if(x<=l&&y>=r)
	{
		a[rt]+=z;
		la[rt]+=z;
		return;
	}
	if(la[rt])_updata(rt);
	int mid=(l+r)/2;
	if(x<=mid)insert(x,y,z,lson);
	if(y>mid)insert(x,y,z,rson);
	a[rt]=max(a[rt<<1],a[rt<<1|1]);
}
int find(int x,int y,int rt,int l,int r)
{
	if(x<=l&&y>=r)return a[rt];
	int mid=(l+r)/2;
	if(la[rt])_updata(rt);
	if(y<=mid)return find(x,y,lson);
	if(x>mid)return find(x,y,rson);
	return max(find(x,y,lson),find(x,y,rson));
}

int main()
{
	freopen("railway.in","r",stdin);
	freopen("railway.out","w",stdout);
	scanf("%d%d%d",&c,&s,&r);
	for(int i=1;i<=r;i++)
	{
		int x,y,z;
		scanf("%d%d%d",&x,&y,&z);
		int k=find(x,y-1,1,1,c-1);
		if(k+z>s)
		{
			printf("NO\n");
			continue;
		}
		else
		{
			printf("YES\n");
			insert(x,y-1,z,1,1,c-1);
		}
	}
	return 0;
}