BestCoder Round #90 //div all 大混战 一题滚粗 阶梯博弈，树状数组，高斯消元

传送门 https://www.luogu.org/problemnew/show/P4479 题目描述 在平面直角坐标系上,有 n 个不同的点.任意两个不同的点确定了一条直线.请求出所有斜率存在的直线按斜率从大到小排序后,第 k 条直线的斜率为多少. 为了避免精度误差,请输出斜率向下取整后的结果.(例如: ?1.5? = 1 , ??1.5? = ?2 ) 分析 一开始打了一个暴力,10分后来改着改着成了30分,浮点误差. 正解其实很简单,我们首先逆向思考一下,如果我们假设已经有了斜率k. 如

Game 问题描述 XY在玩一个游戏:有N根柱子排成一排,编号为1到N,每个柱子上面有一块宝石,现在XY站在第S根柱子上,出口在第T跟柱子上,XY需要拿到所有宝石后从出口离开.每次XY可以走到相邻的柱子上,也可以使用超能力跳到第一根柱子或者第N根柱子上,如果离开了柱子之后再也不能到达这里.为了节省能量,XY想用最少次数超能力通关. 输入描述 输入有多组数据,不超过1000组. 每组数据输入一行包含3个整数,N,S和T.(1\leq N\leq10000,1\leq S,T\leq N )(1≤N

这题说的给了100000个数有100000次操作 询问 L和R 区间内 在D位上为P的个数,用树状数组存 要开[10][10][100000]的int 开不了但是能开 这么大的unsign short 这样我们将这个树状数组一分为二 50000 个位前面 50000 为后面 我们知道unshort 范围在60000多显然这样是可以开的了 #include <iostream> #include <cstdio> #include <string.h> using nam

Problem Description After trying hard for many years, Victor has finally received a pilot license. To have a celebration, he intends to buy himself an airplane and fly around the world. There are n countries on the earth, which are numbered from 1 to

题目链接: huangjing hdu5054 Alice and Bob 思路: 就是(x,y)在两个參考系中的表示演全然一样.那么仅仅可能在这个矩形的中点.. 题目: Alice and Bob Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 216    Accepted Submission(s): 166 Problem De

HDOJ5054 Alice and Bob Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 302    Accepted Submission(s): 229 Problem Description Bob and Alice got separated in the Square, they agreed that if they

传送门 xiaoxin juju needs help Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 861    Accepted Submission(s): 243 Problem Description As we all known, xiaoxin is a brilliant coder. He knew **palin

Baby Ming and Weight lifting Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 681    Accepted Submission(s): 280 Problem Description Baby Ming is fond of weight lifting. He has a barbell pole(the

题目传送:BestCoder Round #50 (div.2) BC感觉越做越无语了 1001.Distribution money AC代码: #include <map> #include <set> #include <list> #include <cmath> #include <deque> #include <queue> #include <stack> #include <bitset> #