c语言题利用公式s=1/12-1/22+1/32-1/42

1个回答

double s = 0;
int sign = 1;
int div = 12;
do
{
double d = sign / (double)div;
s += d;
sign = -sign;
div += 10;
} while (fabs(d) >= 0.00001);
printf("%lf", s);

c语言题利用公式s=1/12-1/22+1/32-1/42

Problem Description Roy has just moved into a new apartment. Well, actually the apartment itself is not very new, even dating back to the days before people had electricity in their houses. Because of this, Roy's apartment has only one single wall outlet, so Roy can only power one of his electrical appliances at a time. Roy likes to watch TV as he works on his computer, and to listen to his HiFi system (on high volume) while he vacuums, so using just the single outlet is not an option. Actually, he wants to have all his appliances connected to a powered outlet, all the time. The answer, of course, is power strips, and Roy has some old ones that he used in his old apartment. However, that apartment had many more wall outlets, so he is not sure whether his power strips will provide him with enough outlets now. Your task is to help Roy compute how many appliances he can provide with electricity, given a set of power strips. Note that without any power strips, Roy can power one single appliance through the wall outlet. Also, remember that a power strip has to be powered itself to be of any use. Input Input will start with a single integer 1 <= N <= 20, indicating the number of test cases to follow. Then follow N lines, each describing a test case. Each test case starts with an integer 1 <= K <= 10, indicating the number of power strips in the test case. Then follow, on the same line, K integers separated by single spaces, O1 O2 . . . OK, where 2 <= Oi <= 10, indicating the number of outlets in each power strip. Output Output one line per test case, with the maximum number of appliances that can be powered. Sample Input 3 3 2 3 4 10 4 4 4 4 4 4 4 4 4 4 4 10 10 10 10 Sample Output 7 31 37

Problem Description Life is a game,and you lose it,so you suicide. But you can not kill yourself before you solve this problem: Given you a sequence of number a1, a2, ..., an.They are also a permutation of 1...n. You need to answer some queries,each with the following format: If we chose two number a,b (shouldn't be the same) from interval [l, r],what is the maximum gcd(a, b)? If there's no way to choose two distinct number(l=r) then the answer is zero. Input First line contains a number T(T <= 5),denote the number of test cases. Then follow T test cases. For each test cases,the first line contains a number n(1 <= n <= 50000). The second line contains n number a1, a2, ..., an. The third line contains a number Q(1 <= Q <= 50000) denoting the number of queries. Then Q lines follows,each lines contains two integer l, r(1 <= l <= r <= n),denote a query. Output For each test cases,for each query print the answer in one line. Sample Input 1 10 8 2 4 9 5 7 10 6 1 3 5 2 10 2 4 6 9 1 4 7 10 Sample Output 5 2 2 4 3

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