Function
题目描述
Serega and Fedor play with functions. One day they came across a very interesting function. It looks like that:
- f(1,j)=a[j], 1≤j≤n.
- f(i,j)=min(f(i-1,j),f(i-1,j-1))+a[j], 2≤i≤n, i≤j≤n.
Here a is an integer array of length n.
Serega and Fedya want to know what values this function takes at some points. But they don't want to calculate the values manually. So they ask you to help them.
The first line contains integer n (1≤n≤105) − the length of array a. The next line contains n integers: a[1],a[2],...,a[n] (0≤a[i]≤104).
The next line contains integer m (1≤m≤105) − the number of queries. Each of the next m lines contains two integers: xi, yi (1≤xi≤yi≤n). Each line means that Fedor and Serega want to know the value of f(xi,yi).
Print m lines − the answers to the guys' queries.
6
2 2 3 4 3 4
4
4 5
3 4
3 4
2 3
12
9
9
5
7
1 3 2 3 4 0 2
4
4 5
2 3
1 4
4 6
11
4
3
0
题目来源：fps-www.educg.net-codeforce-1-2833.xml.zip；FPS 共享题包，题包内第 1526 题。保留原作者与原赛事署名。