math

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 I see it is possible to use the format method on a LaTeX string in python by using a double curly bracket as shown here. For instance: In[1]: 'f_{{{0}}}'.format('in') Out[1]: 'f_{in}' But how can I use the format method in a math LaTeX string? (particularly for subscripts) For example, with: In[2]: r'$f_{in,{{0}}}$'.format('a') I would expect: Out[2]: '$f_{in,a}$' But I get a ValueError: unexpected '{' in field name 回答1: The correct statement for In[2] should be: r'$f_{{in,{0}}}$'.format('a')

问题 I see it is possible to use the format method on a LaTeX string in python by using a double curly bracket as shown here. For instance: In[1]: 'f_{{{0}}}'.format('in') Out[1]: 'f_{in}' But how can I use the format method in a math LaTeX string? (particularly for subscripts) For example, with: In[2]: r'$f_{in,{{0}}}$'.format('a') I would expect: Out[2]: '$f_{in,a}$' But I get a ValueError: unexpected '{' in field name 回答1: The correct statement for In[2] should be: r'$f_{{in,{0}}}$'.format('a')

问题 I see it is possible to use the format method on a LaTeX string in python by using a double curly bracket as shown here. For instance: In[1]: 'f_{{{0}}}'.format('in') Out[1]: 'f_{in}' But how can I use the format method in a math LaTeX string? (particularly for subscripts) For example, with: In[2]: r'$f_{in,{{0}}}$'.format('a') I would expect: Out[2]: '$f_{in,a}$' But I get a ValueError: unexpected '{' in field name 回答1: The correct statement for In[2] should be: r'$f_{{in,{0}}}$'.format('a')

问题 I have a plane, plane A , defined by its orthogonal vector, say (a, b, c) . (i.e. the vector (a, b, c) is orthogonal to plane A ) I wish to project a vector (d, e, f) onto plane A . How can I do it in Python? I think there must be some easy ways. 回答1: Take (d, e, f) and subtract off the projection of it onto the normalized normal to the plane (in your case (a, b, c) ). So: v = (d, e, f) - sum((d, e, f) *. (a, b, c)) * (a, b, c) / sum((a, b, c) *. (a, b, c)) Here, by *. I mean the component

问题 Here is my function to roundoff a number upto two decimals but when the rounded off number is 1.50 it seems to ignore the trailing zero and just returns 1.5 public static double roundOff(double number) { double accuracy = 20; number = number * accuracy; number = Math.ceil(number); number = number / accuracy; return number; } So if I send 1.499 it returns 1.5 where as I want 1.50 回答1: This is a printing poblem: double d = 1.5; System.out.println(String.format("%.2f", d)); // 1.50 回答2: 1.5 is,