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摘要： DescriptionIt is always very nice to have little brothers or sisters. You can tease them, lock them in the bathroom or put red hot chili in their sandwiches. But there is also a time when all meanness comes back! As you know, in one month it is Christmas and this year you are honored to make the big 阅读全文

摘要： DescriptionLet f(n) be the number of factors of integer n.Your task is to count the number of i(1 #define MAXN 1000001int f[MAXN]={0};int s[MAXN]={0};int c[MAXN]={0};int main(){ //先求出每个数的因子数 for(int i=1; i<MAXN; i++){ for(int j=1; i*j<MAXN; j++){ f[i*j]++; } } /... 阅读全文

摘要： DescriptionIn Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls in it. The Royal Pearl has its name because it delivers to the royal family of Pearlania. But it also produces bracelets and necklaces for ordinary people. Of course the qu 阅读全文