为什么0分？

题目传送门

#include<bits/stdc++.h>
using namespace std;
struct node {
	int x,v;
} a[200005];
int b[200005];
struct sal {
	int tp,l,r,w;
} zhe[100005];
bool cmp(node x,node y) {
	return x.x<y.x;
}
int main() {
	int n,num=0;
	cin>>n;
	for(int i=1; i<=n; i++) {
		cin>>zhe[i].tp;
		if(zhe[i].tp==1)cin>>zhe[i].l>>zhe[i].r>>zhe[i].w;
		else cin>>zhe[i].l>>zhe[i].w;
		if(zhe[i].tp!=1) {
			a[++num].x=b[num]=zhe[i].l;
		} else {
			a[++num].x=b[num]=zhe[i].l;
			a[++num].x=b[num]=zhe[i].r;
		}
	}
	sort(a+1,a+num+1,cmp);
	sort(b+1,b+num+1);
	for(int i=1; i<=n; i++) {
		if(zhe[i].tp==1) {
			int l=lower_bound(b+1,b+n+1,zhe[i].l)-b,r=lower_bound(b+1,b+n+1,zhe[i].r)-b;
			a[l].v+=zhe[i].w;
			a[r+1].v-=zhe[i].w;
		}
		if(zhe[i].tp==2) {
			int l=lower_bound(b+1,b+n+1,zhe[i].l)-b;
			a[l].v+=zhe[i].w;
			a[l+1].v-=zhe[i].w;
		}
		if(zhe[i].tp==3) {
			int l=lower_bound(b+1,b+n+1,zhe[i].l)-b;
			a[0].v+=zhe[i].w;
			a[l].v-=zhe[i].w;
			a[l+1].v+=zhe[i].w;
		}
	}
	int ans=0,v,sum=a[0].v;
	for(int i=1; i<=num; i++) {
		sum+=a[i].v;
		if(sum>ans) {
			ans=sum;
			v=a[i].x;
		}
	}
	cout<<ans<<" "<<v;
}