13 lines
317 B
Python
13 lines
317 B
Python
from sys import stdin
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n,m=map(int,stdin.readline().rstrip().split())
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arr=list(map(int,stdin.readline().rstrip().split()))
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sarr=[]
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sarr.append(arr[0])
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for i in range(1,n):
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sarr.append(sarr[i-1]+arr[i])
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for i in range(m):
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a,b=map(int,stdin.readline().rstrip().split())
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print(sarr[b-1]-sarr[a-1]+arr[a-1])
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