题解 | #【模板】静态区间和（前缀和）#Python3
【模板】静态区间和（前缀和）
https://www.nowcoder.com/practice/ac79a1a4a66646cc87525d6faa86e021
n, q = map(int, input().split())
# 错开a[0]这个位置
a = [0]
a.extend(list(map(int, input().split())))
b = a.copy()
# 构造前缀和数列
for i in range(1, n+1):
b[i] = b[i-1] + a[i]
for _ in range(0, q):
l, r = map(int, input().split())
print(b[r]-b[l-1])
#15天刷题#
