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 很像二维偏序，我们把武器和怪物放在一起排序按照攻击力递增的顺序，顺序扫描，这样攻击力满足了要求，然后防御力可以用一个线段树来处理，具体看代码

#include<iostream>
#include<cstdio>
#include<cstring>
#include<vector>
#include<algorithm>
#define forn(i, n) for (int i = 0 ; i < int(n) ; i++)
#define fore(i, s, t) for (int i = s ; i < (int)t ; i++)
#define fi first
#define se second
#define all(x) x.begin(),x.end()
#define pf2(x,y) printf("%d %d\n",x,y)
#define pf(x) printf("%d\n",x)
#define each(x) for(auto it:x)  cout<<it<<endl;
#define pii pair<int,int>
#define sc(x) scanf("%d",&x)
using namespace std;
typedef long long ll;
const int maxn=1e6+5;
int vv[maxn<<2],lz[maxn<<2];
#define ls o<<1
#define rs o<<1|1
#define lss ls,l,mid
#define rss rs,mid+1,r
void push_up(int o,int l,int r){
	if(lz[o]){
		lz[ls]+=lz[o];
		lz[rs]+=lz[o];
		vv[ls]+=lz[o];
		vv[rs]+=lz[o];
		lz[o]=0;
	}
}
void update(int o,int l,int r,int ql,int qr,int val){
	if(l>=ql && r<=qr) {
		vv[o]+=val;
		lz[o]+=val;
		return ;
	}
	else {
		push_up(o,l,r);
		int mid=l+r>>1;
		if(ql<=mid) update(lss,ql,qr,val);
		if(qr>mid) update(rss,ql,qr,val);
		vv[o]=max(vv[ls],vv[rs]);
	}
}
int n,m,p;
struct Weapons{
	int a,ca;
}weapon[maxn];
struct Armor{
	int b,cb;
}armor[maxn];
struct Monsters{
	int x,y,z;
}monster[maxn];
void build(int o,int l,int r){
	if(l==r) vv[o]=-armor[l].cb;
	else {
		int mid=l+r>>1;
		build(lss);
		build(rss);
		vv[o]=max(vv[ls],vv[rs]);
	}
}
int Find(int x){
	int l=1,r=m+1;
	while(l<r){
		int mid=l+r>>1;
		if(armor[mid].b<x) l=mid+1;
		else r=mid;
	}
	return l;
}
int main(){
	cin>>n>>m>>p;
	for(int i=1;i<=n;i++){
		scanf("%d%d",&weapon[i].a,&weapon[i].ca);
	}
	for(int i=1;i<=m;i++){
		scanf("%d%d",&armor[i].b,&armor[i].cb);
	}
	for(int i=1;i<=p;i++){
		scanf("%d%d%d",&monster[i].x,&monster[i].y,&monster[i].z);
	}
	sort(weapon+1,weapon+n+1,[](Weapons X,Weapons Y){
		return X.a<Y.a;	
	});
	sort(armor+1,armor+m+1,[](Armor X,Armor Y){
		return X.b<Y.b;
	});
	sort(monster+1,monster+p+1,[](Monsters X,Monsters Y){
		return X.x<Y.x;
	});
	build(1,1,m);
	int ans=-2e9,tl=1,tr=1;
	for(int i=1;i<=n+p;i++){
		if(tr>p || (tl<=n && weapon[tl].a<=monster[tr].x)) {
			ans=max(ans,vv[1]-weapon[tl].ca);
			++tl;
		}
		else {
			int pos=Find(monster[tr].y+1);
			if(pos<=m) {
				update(1,1,m,pos,m,monster[tr].z);
			}
			++tr;
		}
	}
	printf("%d\n",ans);
	
	
}