[백준] 11659 - 구간 합 구하기 4 (파이썬)

import sys
input = sys.stdin.readline
n, m = map(int,input().split())
number = list(map(int,input().split()))
for i in range(1,len(number)):
    number[i] += number[i-1]
for i in range(m):
    x, y = map(int,input().split())
    if x==1:
        print(number[y-1])
    else:
        print(number[y-1]-number[x-2])