B. Odd sum 题目链接:http://codeforces.com/problemset/problem/797/B time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given sequence a1, a2, ..., an of integer numbers of length n. Your ta…

https://codeforces.com/problemset/problem/797/B time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given sequence a1, a2, ..., an of integer numbers of length n. Your task is to find s…

Note: 子序列,可以不连续:子字符串,必须连续. 以下题目按在我看看来的难度从易到难排列: 最大和子序列(Maximum sum subsequence) 这道题纯属娱乐...应该不会有人出这种题吧.方案是贪心法,遇到正数就放入序列. vector<int> msseq(vector<int> &num) { vector<int> result; for(int i : num) ) result.push_back(i); return result;…

A. Square Function 留坑. B. Guess by Remainder 询问$lcm(1,2,3,...,n)-1$即可一步猜出数. 计算$lcm$采用分治FFT即可,时间复杂度$O(n\log^2n)$. C. Subtract if Greater! 对于每个修改操作,$[1,x]$的数无需修改,$[x+1,2x]$的数会减小至少一半,暴力修改即可,$[2x+1,inf]$的数减小之后排名不变,故可以在平衡树上打标记实现. 时间复杂度$O(n\log^2n+m\log n)…

B. Odd sum time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given sequence a1, a2, ..., an of integer numbers of length n. Your task is to find such subsequence that its sum is odd a…

Description You are given sequence a1, a2, ..., an of integer numbers of length n. Your task is to find such subsequence that its sum is odd and maximum among all such subsequences. It's guaranteed that given sequence contains subsequence with odd su…

Given a sequence of K integers { N1, N2, ..., NK }. A continuous subsequence is defined to be { Ni, Ni+1, ..., Nj } where 1 <= i <= j <= K. The Maximum Subsequence is the continuous subsequence which has the largest sum of its elements. For examp…

1​​, N2N_2N​2​​, ..., NKN_KN​K​​ }. A continuous subsequence is defined to be { NiN_iN​i​​, Ni+1N_{i+1}N​i+1​​, ..., NjN_jN​j​​ } where 1≤i≤j≤K1 \le i \le j \le K1≤i≤j≤K. The Maximum Subsequence is the continuous subsequence which has the largest sum…

3638: Cf172 k-Maximum Subsequence Sum Time Limit: 50 Sec  Memory Limit: 256 MBSubmit: 174  Solved: 92[Submit][Status][Discuss] Description 给一列数,要求支持操作: 1.修改某个数的值 2.读入l,r,k,询问在[l,r]内选不相交的不超过k个子段,最大的和是多少. Input The first line contains integer n (1 ≤ n …

Given a sequence of K integers { N1, N2, ..., NK }. A continuous subsequence is defined to be { Ni, Ni+1, ..., Nj } where 1 <= i <= j <= K. The Maximum Subsequence is the continuous subsequence which has the largest sum of its elements. For examp…