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Language:反正切函数的应用Time Limit:1000MSMemory Limit:10000KTotal Submissions:12424Accepted:4490Description 反正切函数可展开成无穷级数，有如下公式(其中0 #includeint main(){ __int64 a,i; scanf("%I64d",&a); for(i = a+1 ; i >= 1 ; i--) { if((a*a+1)%i == 0) { printf("%I64d\n",a+a+i+(a*a+1)/i); break; } } 阅读全文
摘要：
Goldbach's ConjectureTime Limit:1000MSMemory Limit:65536KTotal Submissions:28052Accepted:10800Description In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture:Every even number greater than 4 can bewritten as the s 阅读全文