题目链接:http://codeforces.com/problemset/problem/1511/D 定义一个字符串 ss 的花费为满足 si=sjsi=sj 且si+1=sj+1si+1=sj+1 的数对 (i,j)(i,j) 的数量(0≤i<j<|s|−10≤i<j<|s|−1) 现在需要使用从小写字母 aa 开始的 mm 种字符,构造一个长度为 nn 的字符串,且要求花费最小。
Educational Codeforces Round 107 (Rated for Div. 2) D. Min Cost String (贪心,构造) 题意:给你两个正整数nn和kk,要你构造一个只包含前kk个字母的字符串([a,a+k−1][a,a+k−1]),使得对于任意两个不相交的连续长度为22的区间,相等的子串数最少....
[D. Min Cost String](https://codeforces.com/contest/1511/problem/D) I have an intutive approach but I want to know why he work??I want proof?? suppose we will use the first 5 character.. first: we will put the the characters at even position like that: `a_b_c_d_e_a_b_c_...
Educational Codeforces Round 96 (Rated for Div. 2) D. String Deletion【思维】 传送门:D. String Deletion 题意 给你一个长度为 n n n,只包含0,1字符的字符串 s s s。你可以操作字符串,每次操作是由自己选一个位置 i i i并删除 s i s_i si,之后系统将会自动删除相同字符组成的最长前缀。
Given the m ranges that denotes subarray of an array of length n i --> [l ,r] 1<=l<=r<=n Cost of Concatination of two ranges is 1 Find the min cost to overlap the whole array or return -1 if not exist 1<=n<=100
构造一个长度为n nn字符串,只能使用字母表前k kk个字母,使得s i = s j s_i=s_jsi=sj并且s i + 1 = s j + 1 s_{i+1} =s_{j+1}si+1=sj+1的( i , j ) (i,j)(i,j)数量最少。 题解: 当n nn到达一定长度时,必然会存在上述( i , j ) (i,j)(i,j)。
Educational Codeforces Round 107 (Rated for Div. 2) D. Min Cost String(Map/贪心/瞎搞) Let's define thecostof a string 𝑠s as the number of index pairs i and j (1≤i<j<|s|) such that si=sj and si+1=sj+1. You are given two positive integers n and k. Among all strings ...
I was reading again just for fun about max flow and I remembered a thought I had back when in my training days. It is very common to use a modified version of Bellman-Ford to solve the min cost max flow problem, called Shortest Path Faster Algorithm (SPFA, you can read about it on...
In problem 316C2, the solution is to find Max Flow Min Cost of the constructed graph. Skimming through some fastest submissions, I noticed that there is a function called modify_label that replaced SPFA to find shortest path in normal MFMC.Here is one of those submisions. ...
Hi guys, I was looking for min-cost-max-flow problems and found this http://www.spoj.com/problems/GREED/ I coded solution, submitted it and received AC with about20stime. Unfortunately, there are accepted runs with timeless than 2s. ...