题解 | 大整数哈希
大整数哈希
https://www.nowcoder.com/practice/29f0cff8a69b4ab6a2f63fb7386defa3
from ast import Mod
import sys
f = {} # 模拟哈希表 x --- fx
n = int(input())
res = 0
MOD = 2**64
for i in range(n):
line = input().split()
x = int(line[0])
y = int(line[1])
ans_i = f.get(x,0)
res = (res + (i+1) * ans_i) % MOD
# print(f"{i} * {ans_i} = ",i * ans_i)
f[x] = y
print(res)
