https://www.acmicpc.net/problem/11659
import sys
n,m =map(int,sys.stdin.readline().split(" "))
num = [0] + list(map(int, sys.stdin.readline().split()))
for _ in range(m):
sum = 0
start,end = map(int,sys.stdin.readline().split(" "))
for i in range(start,end+1):
sum += num[i]
print(sum)
import sys
n,m =map(int,sys.stdin.readline().split(" "))
num = [0] + list(map(int, sys.stdin.readline().split()))
dp = [0]*100001
for i in range(1,n+1):
dp[i] = num[i]+ dp[i-1]
for _ in range(m):
sum = 0
start,end = map(int,sys.stdin.readline().split(" "))
print(dp[end] - dp[start-1])
import sys
n,m =map(int,sys.stdin.readline().split(" "))
num = [0] + list(map(int, sys.stdin.readline().split()))
dp = [0]*(n+1)
for i in range(1,n+1):
dp[i] = num[i]+ dp[i-1]
for _ in range(m):
start,end = map(int,sys.stdin.readline().split(" "))
print(dp[end] - dp[start-1])