这道题有两种做法,一种是 扩展域(种类并查集),一种是 边带权(带权并查集).种类并查集貌似应该都比带权并查集简单,所以先讲种类并查集的做法,再讲带权并查集 种类并查集 若 sum[ l ~ r ] 表示 l到r 之间1的个数,sum是一个前缀和数组,那么有 sum [ l ~ r ] = sum[ r ] - sum[ l - 1 ] .如果有sum[ l ~ r]为奇数个,那么 sum[ r ]和sum[ l - 1 ]肯定奇偶性不同:如果有sum[ l ~ r]为偶数个,那么 sum[ r…
C. The Game Of Parity time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output There are n cities in Westeros. The i-th city is inhabited by ai people. Daenerys and Stannis play the following game:…
C. Parity Game 题目连接: http://www.codeforces.com/contest/298/problem/C Description You are fishing with polar bears Alice and Bob. While waiting for the fish to bite, the polar bears get bored. They come up with a game. First Alice and Bob each writes…
描述 Now and then you play the following game with your friend. Your friend writes down a sequence consisting of zeroes and ones. You choose a continuous subsequence (for example the subsequence from the third to the fifth digit inclusively) and ask hi…
POJ1733 Parity game Description Now and then you play the following game with your friend. Your friend writes down a sequence consisting of zeroes and ones. You choose a continuous subsequence (for example the subsequence from the third to the fifth…
Codeforces Global Round 1 题目链接:https://codeforces.com/contest/1110 A. Parity 题意: 给出{ak},b,k,判断a1*b^(k-1)+a2*b^(k-2)+...+ak*b^0的奇偶性. 题解: 暴力求模2意义下的值就好了. 代码如下: #include <bits/stdc++.h> using namespace std; typedef long long ll; ; int n; int b,k; int a[…
Parity Game Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 12853 Accepted: 4957 题目链接:http://poj.org/problem?id=1733 Description: Now and then you play the following game with your friend. Your friend writes down a sequence consisting…
题目链接:http://codeforces.com/problemset/problem/549/C C. The Game Of Parity time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output There are n cities in Westeros. The i-th city is inhabited by ai pe…
题目链接:http://poj.org/problem?id=1733 Parity game Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 9806 Accepted: 3795 Description Now and then you play the following game with your friend. Your friend writes down a sequence consisting of…
ZOJ 4081 Little Sub and Pascal's Triangle 题解 题意 求杨辉三角第n行(从1开始计数)有几个奇数. 考察的其实是杨辉--帕斯卡三角的性质,或者说Gould's sequence的知识. 其实网上很多题解都给出了答案,但大多数都只是给了一个结论或者说找规律(虽然我也是选择打表找规律先做的),但是思考为什么的时候我百度了一下,在wiki看了一些东西. wiki Pascal's triangle(https://en.wikipedia.org/wiki/P…
我要举报本次校赛出题人的消极出题!!! 官方题解请戳:http://3.scnuacm2015.sinaapp.com/?p=89(其实就是一堆代码没有题解) A. 树链剖分数据结构板题 题目大意:我没看,看不懂. 基本思路:我不会. 参考代码:找Oyk老师和Czj老师去. B. The background of water problem 题目大意(大写加粗的水题):给定$N$个学生和他们$K$个科目的成绩$S_i$,再给出各科目$K_i$的权重顺序$Q_i$,求排名之后,拥有id为$X$的…
Problems # Name A Infinite Sequence standard input/output 1 s, 256 MB x3509 B Restoring Painting standard input/output 1 s, 256 MB x2519 C Money Transfers standard input/output 1 s, 256 MB x724 D Tree Construction standard input/outp…
A.Relic Discovery_hdu5982 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 57 Accepted Submission(s): 49 Problem Description Recently, paleoanthropologists have found historical remains on an…
