#P1373F. Network Coverage
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ID: 5447
Type: RemoteJudge
2000ms
256MiB
Tried: 0
Accepted: 0
Difficulty: (None)
Uploaded By:
Hydro
Tags> Network Coverage
No submission language available for this problem.
Description
The government of Berland decided to improve network coverage in his country. Berland has a unique structure: the capital in the center and $n$ cities in a circle around the capital. The capital already has a good network coverage (so the government ignores it), but the $i$-th city contains $a_i$ households that require a connection.
The government designed a plan to build $n$ network stations between all pairs of neighboring cities which will maintain connections only for these cities. In other words, the $i$-th network station will provide service only for the $i$-th and the $(i + 1)$-th city (the $n$-th station is connected to the $n$-th and the $1$-st city).
All network stations have capacities: the $i$-th station can provide the connection to at most $b_i$ households.
Now the government asks you to check can the designed stations meet the needs of all cities or not — that is, is it possible to assign each household a network station so that each network station $i$ provides the connection to at most $b_i$ households.
The first line contains a single integer $t$ ($1 \le t \le 10^4$) — the number of test cases.
The first line of each test case contains the single integer $n$ ($2 \le n \le 10^6$) — the number of cities and stations.
The second line of each test case contains $n$ integers ($1 \le a_i \le 10^9$) — the number of households in the $i$-th city.
The third line of each test case contains $n$ integers ($1 \le b_i \le 10^9$) — the capacities of the designed stations.
It's guaranteed that the sum of $n$ over test cases doesn't exceed $10^6$.
For each test case, print YES, if the designed stations can meet the needs of all cities, or NO otherwise (case insensitive).
Input
The first line contains a single integer $t$ ($1 \le t \le 10^4$) — the number of test cases.
The first line of each test case contains the single integer $n$ ($2 \le n \le 10^6$) — the number of cities and stations.
The second line of each test case contains $n$ integers ($1 \le a_i \le 10^9$) — the number of households in the $i$-th city.
The third line of each test case contains $n$ integers ($1 \le b_i \le 10^9$) — the capacities of the designed stations.
It's guaranteed that the sum of $n$ over test cases doesn't exceed $10^6$.
Output
For each test case, print YES, if the designed stations can meet the needs of all cities, or NO otherwise (case insensitive).
Samples
5
3
2 3 4
3 3 3
3
3 3 3
2 3 4
4
2 3 4 5
3 7 2 2
4
4 5 2 3
2 3 2 7
2
1 1
10 10
YES
YES
NO
YES
YES
Note
In the first test case:
- the first network station can provide $2$ connections to the first city and $1$ connection to the second city;
- the second station can provide $2$ connections to the second city and $1$ connection to the third city;
- the third station can provide $3$ connections to the third city.
In the second test case:
- the $1$-st station can provide $2$ connections to the $1$-st city;
- the $2$-nd station can provide $3$ connections to the $2$-nd city;
- the $3$-rd station can provide $3$ connections to the $3$-rd city and $1$ connection to the $1$-st station.
In the third test case, the fourth city needs $5$ connections, but the third and the fourth station has $4$ connections in total.