Problem 10
Summation of primes
The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.
Find the sum of all the primes below two million.
素数的和
所有小于10的素数的和是2 + 3 + 5 + 7 = 17。
求所有小于两百万的素数的和。
题目解答
朴素解法：暴力枚举
优化算法：素数筛（见第7题）
详细解决方案
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