题解 | 【模板】静态区间和（前缀和）
【模板】静态区间和（前缀和）
https://www.nowcoder.com/practice/ac79a1a4a66646cc87525d6faa86e021
n, c = map(int,input().split())
l = list(map(int,input().split()))
p = [0] * (n+1)
for i in range(n):
p[i+1] = p[i] + l[i]
for i in range(c):
a, d = map(int,input().split())
s = p[d] - p[a-1]
print(s)
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