14 lines
305 B
Python
14 lines
305 B
Python
import sys
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input = sys.stdin.readline
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if __name__ == "__main__":
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N, M = map(int, input().split())
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A = list(map(int, input().split()))
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S = [0]
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for i in range(N):
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S.append(S[-1] + A[i])
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for _ in range(M):
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i, j = map(int, input().split())
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print(S[j] - S[i - 1])
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