C. Chain Reaction 题目连接: http://www.codeforces.com/contest/608/problem/C Description There are n beacons located at distinct positions on a number line. The i-th beacon has position ai and power level bi. When the i-th beacon is activated, it destroys…

C. Chain Reaction   There are n beacons located at distinct positions on a number line. The i-th beacon has position ai and power level bi. When the i-th beacon is activated, it destroys all beacons to its left (direction of decreasing coordinates) w…

Chain Reaction 题意:有n(1 ≤ n ≤ 100 000) 个灯泡,每个灯泡有一个位置a以及向左照亮的范围b (0 <= a <= 1e6 ,1<= b <= 1e6);(题目是按照灯泡位置递增的顺序输入的)每个灯泡的毁坏范围就是灯泡的照亮范围(包括左边界,但是自己不会毁坏).要你在所有灯泡的右边(不能有灯泡的位置相同)任意位置设置一个向左照亮范围任意的灯泡,使得先开设置的灯泡,再从右往左开启题给的灯泡时毁坏的灯泡数最少.很绕,但是题目真的很好~~~ 思路:dp+递…

C. Chain Reaction time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output There are n beacons located at distinct positions on a number line. The i-th beacon has position ai and power level bi. Wh…

Codeforces Round #336 (Div. 2) D. Zuma 题意:输入一个字符串:每次消去一个回文串,问最少消去的次数为多少? 思路:一般对于可以从中间操作的,一般看成是从头开始(因为只需要考虑一边),当考虑最左边的数时,有多少中消去方法?每种消去方法对结果的贡献又是多少?同时结果的区间又是怎么变化?这就是dp式子: 1.当单独消去这个元素时,dp[l][r] = 1 + dp[l+1][r]; 2.当存在一个k,l< k <= r,使得c[l] == c[k]时,可以认为在…

A. Saitama Destroys Hotel time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output Saitama accidentally destroyed a hotel again. To repay the hotel company, Genos has volunteered to operate an eleva…

水 A - Saitama Destroys Hotel 简单的模拟,小贪心.其实只要求max (ans, t + f); #include <bits/stdc++.h> using namespace std; #define lson l, mid, o << 1 #define rson mid + 1, r, o << 1 | 1 typedef long long ll; const int N = 1e5 + 5; const int INF = 0x3f…

B. Hamming Distance Sum time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Genos needs your help. He was asked to solve the following programming problem by Saitama: The length of some string…

D. Zuma 题目连接: http://www.codeforces.com/contest/608/problem/D Description Genos recently installed the game Zuma on his phone. In Zuma there exists a line of n gemstones, the i-th of which has color ci. The goal of the game is to destroy all the gems…

B. Hamming Distance Sum 题目连接: http://www.codeforces.com/contest/608/problem/A Description Genos needs your help. He was asked to solve the following programming problem by Saitama: The length of some string s is denoted |s|. The Hamming distance betw…