4.前缀和

import random
a = [0]
b = 0
c = []
for i in range(100):
    a.append(random.randint(1,100))
"""
1 10
20 50
12 38
45 67
27 89
""" 
for j in range(5):
    t = input().split()
    t = map(int,t)
    t = list(t)
    c.append(t)
for k in range(1,len(a)):
    a[k] = a[k] + a[k - 1]
#print(a)
for m in range(5):
    print(a[c[m][1]] - a[c[m][0] - 1])