xyqzki的专栏

trick:if using python, we can swap two elements like \A[k], A[minimal] = A[minimal], A[k]problem:A non-empty zero-indexed array A consisting of N integers is given. The product of triplet (P, Q, R) equ

题目 A DNA sequence can be represented as a string consisting of the letters A, C, G and T, which correspond to the types of successive nucleotides in the sequence. Each nucleotide has an impact factor,

https://codility.com/programmers/task/min_avg_two_slicehttp://codesays.com/2014/solution-to-min-avg-two-slice-by-codility/这里其实跟 codelity说要练习的prefix sum没关系。这里需要认识到两个hints，一个就是slice with the global MA mu

Problem: We draw N discs on a plane. The discs are numbered from 0 to N − 1. A zero-indexed array A of N non-negative integers, specifying the radiuses of the discs, is given. The J-th disc is drawn w

codelity kcomplementary pairs A non-empty zero-indexed array A consisting of N integers is given. A pair of integers (P, Q) is called K-complementary in array A if 0 ≤ P,

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]. For example, consider